Temat: microstructure - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Structure and Thermoelectric Properties of Inconel 625/Pt Microjoint
Autorzy:: Boczkal, G.
Dadun, K.
Palka, P.
Hotlos, A.
Janoska, M.
Powiązania:: https://bibliotekanauki.pl/articles/355433.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: microjoint
thermocouple
microstructure
Opis:: A method of using the electric charge in a capacitor was applied for the manufacture of thermocouple micro-joints. The motivation for the study was the need to produce a stable welded connection without affecting the geometry of the substrate, which was a thin sheet of Inconel 625 alloy (UNS designation N06625). Within the framework of the research work, a suitable workstation for micro-joints elaboration was built and welding experiments were performed using different electric charges. Studies carried out within the framework of the present work have shown that joints based on Inconel 625 alloy and platinum have the best application properties in the range of small-scale temperature measurements. They can be used, e.g., for monitoring the temperature distribution on the inner surfaces of electric motor casings. An undeniable advantage is in this case the high thermal resistance of both materials used to produce the joint, i.e. the Inconel 625 alloy and platinum. This allows them to be used at high temperatures under atmospheric conditions.
Źródło:: Archives of Metallurgy and Materials; 2019, 64, 1; 197-200
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Prediction of Microstructure in ADI Castings
Autorzy:: Guzik, E.
Sokolnicki, M.
Królikowski, M.
Ronduda, M.
Nowak, A.
Powiązania:: https://bibliotekanauki.pl/articles/353713.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: prediction of microstructure
ADI castings
results of the ADI microstructure examinations
Opis:: Tests were carried out on samples of low-alloy ductile iron with additions of Ni, Cu and Mo, subjected to austempering heat treatment. The samples were austenitized at 850, 900 and 950 °C, and then austempered at T = 210, 240, 270, 300 and 330 °C. The ausferritizing treatment was carried out in a salt bath for the time τ = 2 - 8 hours. Additionally, tests and studies covered samples subjected to the ausferritizing treatment at 270 °C with the time of holding castings in a bath from 2 to 24 hours. Evaluation covered the results of the ADI microstructure examinations and hardness measurements. The ADI matrix morphology was identified counting the average number of ausferrite plates and measuring their width and spacing. The regression equations HB = f (τ, T) and τ = f (HB, T) were derived to establish the, so-called, “process window”, allowing obtaining a priori the required microstructure of ADI and, consequently, the required mechanical properties, mainly hardness, shaping the functional properties of castings, abrasion wear resistance – in particular.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 4; 2159-2164
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Hydrothermal Synthesis, Impedance and Optical Properties of Tm-Doped SrBi2Nb2O9 Ceramics
Autorzy:: Afqir, Mohamed
Stojadinović, Stevan
Elaatmani, Mohamed
Zegzouti, Abdelouahad
Tahiri, Nabiha
Daoud, Mohamed
Powiązania:: https://bibliotekanauki.pl/articles/2048872.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: hydrothermal
microstructure
impendence
luminescent
Opis:: In this study, Strontium Bismuth Niobate (SrBi2-xTmxNb2O9 with 0 ≤ x ≤ 0.1) doped by Tm was synthesized using by the hydrothermal method. The microstructure and electrical properties were mainly investigated. XRD analysis showed a single-phase orthorhombic structure for Tm-doped SrBi2Nb2O9 samples. The crystallite size is anisotropic and the strain is apparently independent of Tm amount. Dielectric properties for doped SrBi2Nb2O9 with Tm3+ ion have the same trend discussed for the pure sample. FTIR resulats showed that NbO6 octahedral is formed, on one hand, and on the other hand, it shows that spectras for doped and undoped samples are nearly the same. The Cross-section of ceramics showed the plate-like morphology, also the distribution of the pore in ceramics are observed for all samples. Tm dopants produce only minor changes in the impendence parameter values at room temperature. The luminescent (PL) properties of Tm-doped SrBi2Nb2O9 ceramic powders were investigated. The optimum Tm3+ concentration for the maximum PL intensity was found to be at x = 0.075.
Źródło:: Archives of Metallurgy and Materials; 2022, 67, 1; 45-50
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The concept of discourse in terms of cognitive linguistics
Autorzy:: Babayeva, Nigar O.
Powiązania:: https://bibliotekanauki.pl/articles/40409777.pdf
Data publikacji:: 2024-03-31
Wydawca:: Wydawnictwo Adam Marszałek
Tematy:: discourse
text
macrostructure
microstructure
Opis:: At the end of the 20th century, the term discourse, which was justified by European linguists, gained relevance in modern linguistics and gave rise to wider research. The ideas about the discourse in the scientific literature have given impetus to each other and facilitated a wider analysis of this term. In Azerbaijani linguistics, this topic is considered a younger field of science. From this point of view, we decided to conduct research in the mentioned direction. In the article, the types of discourse from the point of view of both structure and functionality, and the problems of its comparison with the text are considered.
Źródło:: Reality of Politics; 2024, 27; 7-17
2082-3959
Pojawia się w:: Reality of Politics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: On dynamic of substructured shells
Autorzy:: Woźniak, C.
Powiązania:: https://bibliotekanauki.pl/articles/280224.pdf
Data publikacji:: 1999
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: shells
microstructure
modelling
dynamics
Opis:: The contribution outlines a general modelling method leading from the general equations of thin shells with locally periodic structure to the averaged equations with slowly varying coefficents. The proposed model describes the effects of periodicity cell size on the overall shell response and hence can be applied to the dispersive analysis in dynamic problems.
W pracy przedstawiono metodę prowadzącą od 2D-modelu cienkich powłok o lokalnie periodycznej strukturze do uśrednionych równań o wolno zmiennych współczynnikach. Otrzymane równania opisują wpływ wielkości mikrostruktury na reakcje powłoki i są dogodne zastosowania w analizie zagadnień dynamicznych.
Źródło:: Journal of Theoretical and Applied Mechanics; 1999, 2; 255-265
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Microstructure and properties of alloyed silver-gold nanoparticles
Autorzy:: Prymak, O.
Ristig, S.
Meyer-Zaika, W.
Raabe, D.
Epple, M.
Powiązania:: https://bibliotekanauki.pl/articles/285180.pdf
Data publikacji:: 2014
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:: nanoparticles
microstructure
alloyed nanoparticles
Opis:: Alloyed silver-gold nanoparticles recently raised an interest in biomedicine as potential antibacterial and surface-functionalized agents for imaging, drugdelivery, and tumor thermo-therapy [1,2]. The here synthesized alloyed AgAu nanoparticles with different compositions of silver and gold, as determined by atomic absorption spectroscopy (AAS), were prepared by reduction with citrate and tannic acid in aqueous media and subsequently functionalized by the addition of polyvinylpyrrolidone (PVP) [3]. UV spectroscopy confirmed that the particles consisted of alloyed Ag:Au and are not of a separate core-shell structure. The resulting nanoparticles were monodisperse and had a uniform size of ~6 nm, except pure Ag and Ag:Au-90:10, as shown by differential centrifugal sedimentation (DCS) and transmission electron microscopy (TEM). By means of X-ray powder diffraction (XRD) and use of Rietveld refinement [4], the precise lattice parameters, crystallite size and microstrain were determined. Based on the results by XRD, DCS and TEM it was shown, that the nanoparticles were not twinned, except pure Ag and Ag:Au-90:10. Additionally, a distinct deviation from Vegard’s linear rule of alloy mixtures for the lattice parameter was found for the nanoparticles. This effect was also found for AgAu bulk materials, but was much more pronounced in the nanostate. Further investigations of the crystal structure of the alloyed nanoparticles by means of synchrotron radiation might be helpful to gain more information about the interactions of silver and gold atoms.
Źródło:: Engineering of Biomaterials; 2014, 17, no. 128-129; 77
1429-7248
Pojawia się w:: Engineering of Biomaterials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Structure and Properties of the S49 Rail after a Long Term Outdoor Exposure
Autorzy:: Konieczny, Jarosław
Labisz, Krzysztof
Powiązania:: https://bibliotekanauki.pl/articles/2172345.pdf
Data publikacji:: 2022
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: microstructure
perlite
ferrite
hardness
Opis:: The subject of the research in this work was the S49 rail made of R260 rail steel (1.0623). The carried out investigations concern microstructure tests and tests of mechanical properties of rails after several years of exposure in the open air without usage. The purpose of the work was to determine on the basis of the results of research the possibilities of using the tested rail for usage and application for the construction of tracks on railway sidings. For investigations there were used diverse techniques reaching such engineering materials investigations like light or scanning electron microscope for microstructure investigations, as well as hardness and microhardness test were performed for determinations of the microstructural changes occurred in the upper area of the rails surface. The microstructure changes concerns especially the ferritic and pearlitic structure and the breaks in the present carbide mesh. During investigations it was found out that the tested railway rails are fully useful for application, after machining to achieve required dimensional parameters. It is also of high importance, of the economical point of view, that their price, also in case of earlier installation of the rails, may be lower than the current price offered on the marked for a entire new product. The price difference reaches dimensions in the range of 5% - 10%.
Źródło:: Advances in Science and Technology. Research Journal; 2022, 16, 2; 280--290
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Influence of microstructure and chemistry of carbon nanomaterials coatings on nerve cells
Autorzy:: Frączek-Szczypta, A.
Wedel-Grzenda, A.
Jantas, D.
Powiązania:: https://bibliotekanauki.pl/articles/285693.pdf
Data publikacji:: 2016
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:: carbon nanomaterials
nerve cells
microstructure
Źródło:: Engineering of Biomaterials; 2016, 19, 138; 119
1429-7248
Pojawia się w:: Engineering of Biomaterials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Microstructures of Metallurgical Slags
Autorzy:: Jonczy, I.
Powiązania:: https://bibliotekanauki.pl/articles/351078.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: metallurgical slag; microstructure
phase composition
Opis:: The article characterizes microstructures of metallurgic slag of varying age remaining from the production of iron and steel and the Zn-Pb ore processing in relation to magmatic rocks and ores. Based on microscopic observations - among others - hypocrystalline, hyaline and felsite (characteristic for magmatic rocks) microstructures were observed in the slag. Also microstructures related to ores, including framework and dendritic, colomorphic and corrosive structures were noted. The diversity of the microstructures presented in the article is a result of the differentiation in the formations of individual components of the slags, which depends, inter alia, on the method and the rate of cooling of the alloys.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 1; 61-66
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Wear Characteristics of FeW/FeW-B4C Coatings Produced by TIG Process
Autorzy:: Islak, S.
Powiązania:: https://bibliotekanauki.pl/articles/351663.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: wear
coating
microstructure
TIG process
Opis:: In this study, wear properties of FeW-B₄C coatings produced by tungsten inert gas (TIG) process on the AISI 1060 steel were investigated. TIG process was selected because it is a cost-effective approach for melting-based coatings. The treated surfaces were evaluated and characterized by means of scanning electron microscope (SEM), X-ray diffraction analysis, and electron dispersive spectrometry (EDS). The microhardness and wear experiment were also performed by using a microhardness machine and ball-on-disk tribometer. SEM observations showed that the obtained coating had a smooth and uniform surface. According to XRD analysis, borides and carbides phases formed in the coatings. The wear behavior of the coatings was compared with ball-on-disc configuration wear tests, at the same conditions. Average coefficient of friction values of the coatings were obtained at relatively low levels.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 4; 2001-2006
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Mechanical and corrosion properties of magnesivm-bioceramic nanocomposites
Autorzy:: Kowalski, K.
Nowak, M.
Jurczyk, M.
Powiązania:: https://bibliotekanauki.pl/articles/352234.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: bionanocoinposites
magnesium
bioceramics
microstructure
bionanocomposites
Opis:: Mechanical and corrosion properties of magnesivm-bioceramic nanocomposites Magnesium alloys have recently attracted much attention as a new generation of biodegradable metallic materials. In this work, MglMnlZn0.3Zr-bioceramic nanocomposites and their scaffolds were synthesized using a combination of mechanical alloying and a space-holder sintering process. The phase and microstructure analysis was carried out using X-ray diffraction, scanning electron microscopy and the properties were measured using hardness and corrosion testing equipment. Nanostructured Mg-bioceramic composites with a grain sizes below 73 run were synthesized. The Vickers hardnesses for the bulk nanostructured Mg-based composites are two times greater than that of pure rnicrocrystalline Mg metal (50 HV0.3). Produced Mg-based bionanomaterials can be applied in medicine.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 3; 1437-1440
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Forecasting the distribution of precipitate diameters in the presence of changes in the structure of the material
Autorzy:: Zieliński, A.
Miczka, M.
Golański, G.
Powiązania:: https://bibliotekanauki.pl/articles/356680.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: microstructure
precipitates
statistics
forecasting
ageing
Opis:: The results of investigations on the microstructure of T23 and T24 low-alloy steels as well as P91 and P92 high-chromium steels in the as-received condition and after 70.000 h annealing at 550-650°C are presented. The quantitative analysis of the existing precipitates was performed for representative images of microstructure. The statistical analysis of collected data allowed the parameters of a selected theoretical statistical distribution to be estimated. A forecast of average precipitate diameter and standard deviation of such a distribution for the time of 100,000 hours at 550 and 600°C for T23 and T24 steels and at 600 and 650°C for P91 and P92 steels was calculated. The obtained results of investigations have made it possible to compare changes in the microstructure of various steel grades due to long-term impact of elevated temperature. They have also confirmed the possibility of using, in evaluating the degradation degree of materials in use, the forecasting methods that derive from mathematical statistics, in particular the theory of stochastic processes and forecast by analogy methods. The presented approach allows the development of a forecast of precipitate diameter probability density under the microstructure instability conditions for selected steel grades. The assessment of material condition that takes into consideration, but is not limited to, the precipitate diameter measurement is useful as an assessment component in estimating the time of safe service of power unit elements working under creep conditions.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 1; 273-280
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Omówienie norm ASTM stosowanych w badaniach mikrostruktury
Autorzy:: Hubner, K. J.
Powiązania:: https://bibliotekanauki.pl/articles/274225.pdf
Data publikacji:: 2013
Wydawca:: Roble
Tematy:: normy ASTM
standardy międzynarodowe
badania mikrostruktury
mikrostruktura
ASTM norms
international standards
microstructure investigation
microstructure
Źródło:: LAB Laboratoria, Aparatura, Badania; 2013, 18, 1; 52-55
1427-5619
Pojawia się w:: LAB Laboratoria, Aparatura, Badania
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Evaluation of the differentiation of structural and physicochemical properties of orthodontic wires of AISI 304 stainless steel
Autorzy:: Grygier, D.
Hoppe, V.
Zięty, A.
Rutkowska-Gorczyca, M.
Powiązania:: https://bibliotekanauki.pl/articles/284164.pdf
Data publikacji:: 2018
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:: stainless steel
orthodontics wire
microstructure
Opis:: Wires used for orthodontic arches play a very important role in the process of orthodontic treatment. In combination with the lock attached to the tooth, they move and align the teeth along the set trajectories. Wires of stainless steel are commonly used in orthodontics for several reasons: they are characterised by high resistance to corrosion, high strength and elasticity, formability and a possibility of obtaining defined properties through cold working and annealing during production process. The purpose of the research presented in the work is the analysis of differences of the selected structural properties in the context of corrosion resistance of the orthodontic wire material. The object of the research was edge arches of the 0.016”x0.022” size made of the stainless steel type AISI 304, provided by two different producers: G&H Orthodontics and Adenta. The research methodology involved analysis of chemical and phase composition of the tested alloy, microscopic tests with application of the light and electron microscopy methods, as well as electrochemical direct current measurements. The research presented in the work has shown significant differences in structural and physical-chemical properties of the orthodontic wires made of AISI 304 type stainless steel. Despite the fact, that the tested arches were manufactured of the theoretically the same materials, but by different producers, they significantly differ in chemical composition, metallurgical purity, phase composition and corrosion resistance. In addition, it is worth noticing that the tested materials, in terms of structure, do not meet the normative requirements obligatory for biomaterials.
Źródło:: Engineering of Biomaterials; 2018, 21, 146; 8-13
1429-7248
Pojawia się w:: Engineering of Biomaterials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Modification of microparticles’ microstructure with carbon dioxide for application as cell carriers in modular tissue engineering
Autorzy:: Mielan, B.
Krok-Borkowicz, M.
Pamuła, E.
Powiązania:: https://bibliotekanauki.pl/articles/284508.pdf
Data publikacji:: 2018
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:: carbon dioxide
tissue engineering
microstructure
Źródło:: Engineering of Biomaterials; 2018, 21, 148; 102
1429-7248
Pojawia się w:: Engineering of Biomaterials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 16.

Tytuł:: Microstructure and geotechnical characteristics of a highly plastic clay treated by magnesium chloride
Autorzy:: Bahloul, Ouassila
Abbeche, Khelifa
Bahloul, Azzedine
Powiązania:: https://bibliotekanauki.pl/articles/89060.pdf
Data publikacji:: 2019
Wydawca:: Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:: swelling
treatment
microstructure
salt
oedometer
Opis:: Chemical stabilization of soil is an effective improvement technique because it reduces the ability of the soil to swell. We added different proportions of magnesium chloride to an expansive clay and performed swelling, geotechnical characterization, and mechanical strength tests. The results show that the swelling potential and swelling pressure of the expansive soil were significantly decreased by the addition of magnesium chloride (MgCl₂). This treatment also improved the physical and mechanical characteristics and microstructure of the soil. The soil's plastic limit, shrinkage limit, cohesion, and internal friction angle all increased linearly with the addition of the MgCl₂ stabilizer. However, we observed that the liquid limit of the soil decreased as the level of magnesium chloride was increased.
Źródło:: Mining Science; 2019, 26; 249-262
2300-9586
2353-5423
Pojawia się w:: Mining Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 17.

Tytuł:: Comparative Analysis of Properties and Microstructure of the Plastically Deformed Alloy Inconel®718, Manufactured by Plastic Working and Direct Metal Laser Sintering
Autorzy:: Żaba, K.
Puchlerska, S.
Nowosielski, M.
Głodzik, M.
Tokarski, T.
Seibt, P.
Powiązania:: https://bibliotekanauki.pl/articles/352025.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: comparative analysis
microstructure
Inconel 718
Opis:: Nickel superalloys as Inconel® are materials widely used in the aerospace industry among others for diffusers, combustion chamber, shells of gas generators and other. In most cases, manufacturing process of those parts are used metal strips, produced by conventional plastic processing techniques, and thus by hot or cold rolling. An alternative technology allowing for manufacturing components for jet engines is the technique of 3D printing (additive manufacturing), and most of all Direct Metal Laser Sintering, which is one of the latest achievement in field of additive technologies. The paper presents a comparative analysis of the microstructure and mechanical properties of the alloy Inconel®718 manufactured by plastic working and Direct Metal Laser Sintering technology, in the initial state, after deformation and after heat treatment.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 1; 143-148
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 18.

Tytuł:: Fatigue Life and Microstructure after Multiple Remelting of A359 Matrix Composites Reinforced with SiC Particles
Autorzy:: Klasik, A.
Maj, M.
Pietrzak, K.
Wojciechowski, A.
Sobczak, J.
Powiązania:: https://bibliotekanauki.pl/articles/352210.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: alloy
composite
microstructure
properties
recycling
Opis:: The article presents the results of fatigue life tests and microstructure examinations of A359 alloy matrix composites (F3S.10S and F3S.30S) containing 10 and 30wt% of SiC particles, subjected to multiple remelting by conventional gravity casting. Mechanical characteristics were determined in a modified low cycle fatigue (MLCF) test, enabling rapid estimation of fatigue life and other mechanical parameters in practice of any material. Qualitative and quantitative metallographic examinations were also carried out. The quantitative evaluation of microstructure was performed by computer image analysis. A set of geometrical parameters of the reinforcing particles, pores and eutectic precipitates present in the metal matrix was determined. The relationships between the mechanical parameters, structural characteristics and the number of remelting operations were presented. It was found that up to the fourth remelting, the mechanical characteristics, including fatigue life, are slightly deteriorated but decrease gradually in the subsequent operations of remelting. The observed effect is mainly due to the shrinkage porosity occurring as a result of gravity casting. To eliminate this defect, the use of squeeze casting process was recommended. It has also been shown that multiple remelting can be an easy and economically well-founded alternative to other more expensive recycling methods.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 4; 2123-2128
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 19.

Tytuł:: Mechanical Properties and Microstructure of PM Mn-Cr-Mo Steels With Low Carbon Concentration
Autorzy:: Lichańska, E.
Sułkowski, A.
Ciaś, A.
Powiązania:: https://bibliotekanauki.pl/articles/352303.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: PM steels
microstructure
mechanical properties
Opis:: The effect of chemical composition of the sintering atmosphere on the microstructure and mechanical properties of PM structural low-carbon steels is presented. The base powders were Astaloy CrL, Astaloy CrM, low carbon ferromanganese and graphite C-UF. From the base powders two mixtures with compositions of Fe-3%Mn-(1.5/3%)Cr-(0.2/0.5)%Mo-0.2%C were prepared. Following pressing in a steel rigid die, compacts were sintered at 1250°C for 60 min in a semi-closed container. 5%H₂-95%N₂ mixture and air were the sintering atmospheres. For sintering in air, lumps of ferromanganese were placed with the compacts in the container. After sintering, half of the samples were tempered at 200°C for 60 minutes in air. Mechanical tests (tensile, bend, toughness, hardness) and microstructural investigations were performed. The microstructures of the steels were inhomogeneous, mainly ferritic-bainic. Tempering of steel based on Astaloy CrM sintered in an atmosphere of 5% H₂-95% N₂ slightly reduced tensile strength and toughness: from 748 to 734 MPa and from 7.15 to 6.83 J/cm², respectively. Chemical composition had a greater effect; steels based on Astaloy CrL and Astaloy CrM had tensile strengths 526-665 and 672-748 MPa, hardness 280-325 and 388-421 HV, respectively. The best properties were obtained after sintering in air of Fe-3%Mn-3%Cr-0.5%Mo-0.2%C without heat treatment: tensile strength 672 MPa, toughness 6.93 J/cm², hardness 421.1 HV, 0.2 % offset yield strength 395 MPa.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 1; 109-114
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 20.

Tytuł:: Effect of Heat Treatment on Mechanical Properties and Microstructure Morphology of Low-Alloy High-Strength Steel
Autorzy:: Bolanowski, K.
Powiązania:: https://bibliotekanauki.pl/articles/353874.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: microalloyed steel
mechanical properties
microstructure
Opis:: The paper analyzes the influence of different heat treatment processes on the mechanical properties of low-alloy high-strength steel denoted by Polish Standard (PN) as 10MnVNb6. One of the findings is that, after aging, the mechanical properties of rolled steel are high: the yield strength may reach > 600 MPa, and the ultimate tensile strength is > 700 MPa. These properties are largely dependent on the grain size and dispersion of the strengthening phase in the ferrite matrix. Aging applied after hot rolling contributes to a considerable rise in the yield strength and ultimate tensile strength. The process of normalization causes a decrease in the average grain size and coalescence (reduction of dispersion) of the strengthening phase. When 10MnVNb6 steel was aged after normalization, there was not a complete recovery in its strength properties.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 2A; 475-480
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 21.

Tytuł:: Primary Crystals of AlFeMnSi Intermetallics in the Cast AlSi Alloys
Autorzy:: Warmuzek, M.
Powiązania:: https://bibliotekanauki.pl/articles/355200.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: aluminum alloys
intermetallic
solidification
microstructure
Opis:: In this paper the results of the microscopic observations of the intermetallic AlFeMnSi phases crystals formed in the liquid hypo- and eutectic AlSi alloys containing transition metals 3.0 wt.% Fe and 0.1, 0.5 and 2.0 wt.% Mn were presented. The crystals morphology has been revealed on both polished and deep etched microsections. The different stages of the primary AlFeMnSi phases particles formation in the solidifying alloy and their final morphology were shown as influenced by cooling rate and alloy chemical composition.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 3; 1659-1664
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 22.

Tytuł:: The Effect of the Asymmetrical Rolling Process on Structural Changes in Hot-Rolled Bimetal Sheets
Autorzy:: Rydz, D.
Koczurkiewicz, B.
Stradomski, G.
Garstka, T.
Wypart, J.
Powiązania:: https://bibliotekanauki.pl/articles/356139.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: asymmetric rolling
microstructure
plastic deformation
Opis:: The paper presents research results on the selection of parameters for the asymmetric rolling process of bimetallic plates 10CrMo9-10+X2CrNiMo17-12-2. They consisted in determining the optimum parameters of the process, which would be ensured to obtain straight bands. Such deformation method introduces in the band the deformations resulting from shear stress, which affect changes in the microstructure. But their effect on the structure is more complicated than in the case of homogeneous materials. It has been shown that the introduction of asymmetric conditions into the rolling process results in greater grain refinement in the so-called hard layer. There was no negative effect on the structural changes in the soft layer observed.
Źródło:: Archives of Metallurgy and Materials; 2019, 64, 4; 1495-1501
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 23.

Tytuł:: Microstructure characterization by means of X-ray micro-CT and nanoindentation measurements
Autorzy:: Rajczakowska, M.
Stefaniuk, D.
Łydżba, D.
Powiązania:: https://bibliotekanauki.pl/articles/178547.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: micro-CT
nanoindentation
microstructure
composite
Opis:: The aim of this paper is to present an example of the material microstructure characterization with the use of X-ray micro-CT and nanoindentation measurements. Firstly, the current scope of application of the aforementioned techniques is provided within different fields of science. Then, background of each of the methods is presented. The methodology of X-ray micro-CT is described with the emphasis on the Beer’s law formulation. In addition, the basics of the nanoindentation technique are outlined and major formulas for the hardness and Young’s modulus calculation are given. Finally, example results for a concrete sample are presented. The microstructure of the selected material is firstly characterized in terms of geometry using the results from the microtomograhy measurements, e.g., porosity and attenuation profiles, pore and aggregate size distribution, shape factor of pores, etc. Next, the results of the nanoindentation tests are provided, namely the hardness and Young’s modulus versus the height of the sample. The influence of the number of tests and statistical analysis on the final results is underlined.
Źródło:: Studia Geotechnica et Mechanica; 2015, 37, 1; 75-84
0137-6365
2083-831X
Pojawia się w:: Studia Geotechnica et Mechanica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 24.

Tytuł:: The effect of dynamic compression on the evolution of microstructure in aluminium and its alloys
Wpływ dynamicznego ściskania na mikrostrukturę aluminium i jego stopów
Autorzy:: Leszczyńska-Madej, B.
Richert, M.
Powiązania:: https://bibliotekanauki.pl/articles/352301.pdf
Data publikacji:: 2013
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: aluminium alloys
microstructure
ultrafine-grained microstructure
nanocrystalline microstructure
transmission electron microscopy TEM
stopy aluminium
mikrostruktura
mikrostruktura drobnoziarnista
mikrostruktura nanokrystaliczna
transmisyjny mikroskop elektronowy
Opis:: In the work, the microstructure and selected properties of aluminium and its alloys (AlCu4Zr0.5, AlMg5, AlZn6Mg2.5CuZr) deformed with high strain rate were investigated. The cylindrical samples were compressed by a falling - weight-type impact-testing machine at the strain rate ranging from 1.77-6.06x10² s^-1 in order to attain true strains between Φ = 0 - 0.62. After compression, the microhardness of the samples was tested and the microstructure was examined by means of both optical (LM) and transmission electron microscopy (TEM). Additionally the misorientation of selected microstructural elements using proprietary KILIN software was determined. The large density of shear bands, bands and microbands was the characteristic feature of the microstructure. The statistical width of the microbands observed in the microstructure was calculated using the mean chord method. The obtained data demonstrate reduction of the microbands width with the increase of deformation. The main object of investigations concerns the microstructure elements refinement affected by dynamic compression.
W pracy przedstawiono wyniki badań mikrostruktury i wybranych właściwości polikrystalicznego aluminium i jego stopów: AlMg5, AlCu4Zr0.5, AlZn6Mg2.5CuZr ściskanych dynamicznie za pomocą młota spadowego. Próbki odkształcano w zakresie odkształceń rzeczywistych Φ = 0-0.62 z prędkością odkształcenia z zakresu 1.77-6.06x10² s^-1. Na tak odkształconych materiałach przeprowadzono pomiar mikrotwardości oraz badania mikrostruktury przy zastosowaniu transmisyjnego mikroskopu elektronowego (TEM) i mikroskopu świetlnego (LM), dodatkowo przeprowadzono pomiar dezorientacji w mikroobszarach metodą linii Kikuchiego przy zastosowaniu oprogramowania KILIN. Cechą charakterystyczną mikrostruktury badanych materiałów były licznie obserwowane pasma i pasma ścinania. Wyniki uzyskane przy zastosowaniu transmisyjnego mikroskopu elektronowego dowiodły występowania licznych mikropasm i mikropasm ścinania, które w zależności od materiału przebiegały na tle różnych układów dyslokacyjnych. Obserwowane mikropasma wykazywały dużą dezorientację względem osnowy. Stwierdzono wzajemnie przecinanie się mikropasm. W zakresie wyższych wartości odkształcenia, mikropasma wypełniały niemal całą objętość próbek. Zaobserwowano zależność zmniejszania się średniej szerokości i mikropasm wraz ze wzrostem wielkości odkształcenia i prędkości odkształcenia. Praca miała na celu określenie wpływu prędkości odkształcenia (1.77x10¹ - 6.06x10²s^-1) na możliwość rozdrobnienia mikrostruktury polikrystalicznego aluminium A199.5 i jego stopów (AlMg5, AlCu4Zr0.5, AlZn6Mg2.5CuZr) odkształcanych w procesie dynamicznego ściskania za pomocą młota spadowego.
Źródło:: Archives of Metallurgy and Materials; 2013, 58, 4; 1097-1103
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 25.

Tytuł:: The microstructural properties of explosion welded Ni/Ti joint
Autorzy:: Zdrodowska, K.
Wojsyk, K.
Szala, M.
Powiązania:: https://bibliotekanauki.pl/articles/103160.pdf
Data publikacji:: 2014
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: explosion welding
joint
Ni/Ti microstructure
Opis:: Explosion welding is one of the ways of bonding materials. This method is used to bond metals which either cannot be joined or they are difficult to bond by other methods. The study investigates the metallographic characteristics of Ni/Ti joints in the form of a plate. Microstructures of the joints are examined and hardness measurements are carried out on the bonded materials and their interfaces. A detailed analysis of the distributions of wave length and width is presented. An average microhardness of the interface is found to be higher than that of the base materials.
Źródło:: Advances in Science and Technology. Research Journal; 2014, 8, 22; 71-74
2299-8624
Pojawia się w:: Advances in Science and Technology. Research Journal
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 26.

Tytuł:: Effects of swelly pressure on changes in pore space morphology in Miocene clays from Warsaw: preliminary results and open questions
Autorzy:: Gawriuczenkow, I.
Powiązania:: https://bibliotekanauki.pl/articles/2059190.pdf
Data publikacji:: 2003
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: swelly pressure
microstructure
porosity
hydraulic conductivity
Opis:: Miocene clays of the Poznań series from Warsaw were analysed by scanning electron microscope. The influence of swelly pressure causes soil porosity to decrease slightly together with a reorientation of pores. They become more anisometric, while their original matrix microstructure acquires properties of matrix-turbulent microstructure.
Źródło:: Geological Quarterly; 2003, 47, 2; 215-220
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 27.

Tytuł:: Material investigations of composites and their selected applications in motor transport
Autorzy:: Rudnik, D.
Pietrzak, K.
Wojciechowski, A.
Sobczak, J.
Kowalewski, Z. L.
Powiązania:: https://bibliotekanauki.pl/articles/243917.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: metal matrix composites
microstructure
properties
applications
Opis:: The paper presents advances in the range of brake discs and engine pistons production using metal matrix composites and identifies their advantages in comparison to materials traditionally applied. The wear characteristics in the case of brake discs and thermal shock resistance in the case of pistons were determined. The wear was assessed by measurements of friction coefficients in different temperatures. The thermal shock resistance was described as the crack length formed during the tests. The image analysis was used in the quantitative microstructure assessments for determination of synthetic geometrical parameter correlated with composites properties. The two synthetic geometrical variables have been proposed in the microstructure description of a new generation brake discs and pistons. The selected relationships between functional properties and composite microstructure are presented. It was shown that a life of brake discs made from A359 aluminum alloy reinforced by SiC precipitates is much longer in comparison to traditional, made from cast iron. It was ascertained also that the best thermal shock resistance was obtained in the case of AK12 composite with Al2O3 short fibers in cast heat treated. The results may be treated as the base for the recommendations of tested metal matrix composites for applicability in selected vehicle parts and subsets producing.
Źródło:: Journal of KONES; 2008, 15, 2; 399-407
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 28.

Tytuł:: Blast loading on aluminum foam microstructure
Autorzy:: Miedzińska, D.
Panowicz, R.
Powiązania:: https://bibliotekanauki.pl/articles/244041.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: microstructure
aluminium foam
strain rate effect
Opis:: One of the possible options as a material for protective layers is aluminum foams which become also very popular due to their lightweight and excellent plastic energy absorbing properties. Such characteristics have been appreciated by the automotive industry with continued research to further understand foam properties. Compressed foaming materials exhibit extensive plastic response, while the initial elastic region is limited in tension by a tensile brittle-failure stress. Aluminum foams have become also an attractive material as blast protective layers due to their desirable compressive properties. With different material engineering techniques (as, for example double-layer foam cladding) they can be customized to achieve the most desirable properties. Energy absorption capacity of foams microstructures under blast load was analytically confirmed based on a rigid-perfectly plastic-locking foam model Initial research indicates that energy absorbed by the cladding is much larger than that under quasi-static conditions due to strain rate effect. In this paper a numerical model of a closed cell aluminum foam idealistic microstructure was presented. The quasi static compression tests were carried out with the use of LS Dyna computer code. Then the sample was numerically loaded with the blast wavefrom detonation of explosives and its behavior was analyzed. The results ofboth analyses were compared.
Źródło:: Journal of KONES; 2010, 17, 3; 287-292
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 29.

Tytuł:: The effect of blade thickness on microstructure and mechanical properties of ships sand-cast propeller
Autorzy:: Piaseczny, L.
Rogowski, K.
Powiązania:: https://bibliotekanauki.pl/articles/260368.pdf
Data publikacji:: 2007
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: blade thickness
microstructure
sand-cast propeller
Opis:: The microstructure and resultant mechanical properties of the MM55 manganese brass applied to ship sand - cast propeller were investigated in relation to the propeller blade section thickness. It was stated that the increase of blade section thickness from 15 mm to 45 mm resulted in the increase of the volume fraction of alpha-phase by 5.3% and that of k-phase by 23.7%, the decrease of the volume fraction of betha-phase by 2.9%, the 0.2% proof stress R0.2 by 11.3%, the ultimate tensile strength Rm by 5.5% and the 5.65 So elongation A5 by 16.8%.
Źródło:: Polish Maritime Research; 2007, 4; 15-17
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 30.

Tytuł:: Effect of SiC and GR Reinforcement Particles on the Structure and Functional Properties of Composite Casting E43 MMC Reinforced with SiC Particles
Autorzy:: Boczkal, S.
Dolata, A. J.
Nowak, M.
Powiązania:: https://bibliotekanauki.pl/articles/351537.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: aluminium hybrid composite
microstructure
wear tests
Opis:: The aim of the study was to describe the structure of composites based on the AlSi7Mg2Sr0.03 alloy matrix reinforced with SiC particles added in an amount of 10% and with a mixture of SiC and GR particles added in a total amount of 20%. Studies of the composite structure, were carried out by scanning electron microscopy (SEM). Based on the results of chemical analysis in microregions, an increased content of elements such as Mg, O and Si and of the precipitates was observed at the interface. In many places in the examined sample, GR particles formed partly disintegrated conglomerates with well developed boundaries. The effect of the content of particles of the reinforcing phase on the functional properties of the composite was investigated during studies of abrasion. The lowest mass loss of 5,33mg was obtained for the AlSi7Mg2Sr0.03 alloy reinforced with 10% SiC particles.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 1; 399-404
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 31.

Tytuł:: Microstructure and Mechanical Properties of CrMoV Steel after Long-Term Service
Autorzy:: Golański, G.
Pietryka, I.
Słania, J.
Mroziński, S.
Jasak, J.
Powiązania:: https://bibliotekanauki.pl/articles/351929.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: microstructure
mechanical properties
long-term service
Opis:: The paper presents the results of research on the microstructure and mechanical properties of 12HMF steel after longterm service. The investigated material was taken from a pipeline with circumferential welded joint after 419 988 hours of service at the temperature of 490°C, steam pressure 8 MPa. Performed research has shown that the 12HMF steel after service was characterized by a typical microstructure for this grade of steel, that is a ferritic-bainitic microstructure without any visible advanced processes of its degradation. The investigation of mechanical properties has shown that the examined steel after service was characterized by a very low impact energy KV, and yield strength lower than the required minimum. Whilst tensile strength and yield strength determined at elevated temperature was higher and similar to the standard requirements, respectively. It has been proved that the main cause of an increase in brittleness and a decrease in yield strength of the examined steel should be seen in the segregation of phosphorus to grain boundaries and the formation of precipitate free zones near the boundaries.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 1; 51-54
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 32.

Tytuł:: Dilatometric Study of High Strength Steels Hardenability
Autorzy:: Di Schino, A.
Powiązania:: https://bibliotekanauki.pl/articles/351965.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: high strength steel
quenching
hardenability
microstructure
Opis:: The effect of low-alloy additions on low-C steels hardenability is reported. Various as-quenched materials with microstructures consisting of low-C (granular) bainitic (B), mixed bainitic (B)/martensitic (M) and fully martensitic microstructures were produced. Results show that for a given cooling rate, an increase of austenite grain size (AGS) and of Mo and Cr contents decreases the transformation temperatures and promotes martensite formation.
Źródło:: Archives of Metallurgy and Materials; 2018, 63, 1; 457-460
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 33.

Tytuł:: Metallographic Study of the Casting Made from CMSX-6 SC Nickel-Based Superalloy
Autorzy:: Szczotok, A.
Powiązania:: https://bibliotekanauki.pl/articles/352067.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: superalloy
CMSX-6
microstructure
image analysis
Opis:: Microstructural characterization is an important tool to optimize the properties of engineering materials. Quantitative metallography is a common technique, which provides three-dimensional estimations of phases and structure elements from two-dimensional images. Metallography has been described as both a science and an art [1]. Superalloys are high-performance alloys which exhibits excellent mechanical strength and creep resistance at high temperatures, good surface stability, and corrosion and oxidation resistance. Temperature and corrosion resistant materials such as nickel-based superalloys are prepared mostly with standard metallographic techniques. However, the results can be significantly improved by using finely graded CMP (chemical mechanical polish) polishing solutions on a high napped polishing pad. Sample preparation requires a certain degree of skills and experience, due to the high chemical resistance of most superalloys. Some chemical solutions are able to dissolve the γ matrix and recover the γ' residue, and some others solutions can be used to obtain a contrary effect – dissolve the γ' phase precipitates and recover the γ matrix residue. The aim of the presented research is to describe qualitatively and quantitatively the as-cast microstructure of CMSX-6 SC superalloy. The author’s attention has been concentrated on the γ' phase precipitates morphology. The results of using optical and scanning electron microscopy (SEM) are presented.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 2A; 581-586
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 34.

Tytuł:: The Tribological Properties and the Microstructure Investigations of Tin Babbit with Pb Addition after Heat Treatment
Autorzy:: Leszczyńska-Madej, B.
Madej, M.
Powiązania:: https://bibliotekanauki.pl/articles/355155.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: tribological properties
microstructure investigations
heat treatment
Opis:: The results of tribological tests and microstructure examinations of tin babbit with 1.5 % Pb addition after heat treatment are presented in this paper. The specimens were annealed at 150°C for 2, 8, 24 and 48 hours and then tested for wear resistance and Brinell hardness. The wear tests were carried out using a block-on-ring tester operating under dry and wet conditions. The samples were also investigated by light microscopy (LM) and scanning electron microscopy (SEM).
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 4; 1861-1868
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 35.

Tytuł:: Brazeability and Microstructure of Ag-28Cu Microjoining Filler Produced by High Energy Ball Milling
Autorzy:: Sharma, Ashutosh
Chae, Myoung Jin
Ahn, Byungmin
Powiązania:: https://bibliotekanauki.pl/articles/356672.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: filler
microjoining
dissimilar
ball milling
microstructure
Opis:: In this paper, we have studied the evolution of morphology and brazing behavior of Ag-28Cu alloy filler processed by high energy ball milling. The milling of the powder mixture was carried out for 40 h. The structural and morphological analyses were performed by the X-ray diffraction and scanning electron microscopy. The melting temperature of the braze filler was determined by differential thermal analysis. The filler wetting properties were assessed from the spread area ratio measurements on various Ti substrates. The results indicate that the ball milling can effectively depress the filler melting point and enhance the brazeability. The milled powder mixture showed Ag(Cu) solid solution with a crystallite size of 174-68 nm after 40 h. It was shown that the high energy ball milling can be a potential method to develop low temperature brazing fillers for advanced microjoining applications.
Źródło:: Archives of Metallurgy and Materials; 2020, 65, 4; 1323-1327
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 36.

Tytuł:: Mg-ZrO2 nanocomposite: relative effect of reinforcement incorporation technique
Autorzy:: Hassan, S. F.
Powiązania:: https://bibliotekanauki.pl/articles/352756.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: processing
nanocomposite
magnesium
microstructure
tensile properties
Opis:: In tins study, ingot metallurgy and powder metallurgy processes were used to incorporate 0.2 and 0.7 vol% of nano-size ZrO₂ particles reinforcement to develop magnesium nanocomposite. Both of the processing methods led to reasonably fair reinforcement distribution, substantial gram refinement and minimum porosity in the nanocomposites. Strengthening effect of nano-ZrO₂ reinforcement in the magnesium matrix was greater when incorporated using the ingot metallurgy process. The matrix ductility and resistance to fracture were significantly improved due to the presence of nano-ZrO₂ reinforcement when incorporated using the powder metallurgy process. Tensile fracture surfaces revealed that the less-ductile cleavage fracture mechanism of hexagonal close packed magnesium matrix has changed to more ductile mode due to the presence of nano-ZrO₂ particles in all the processed nanocomposites.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 3; 1521-1528
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 37.

Tytuł:: Amelioration of Ultrasonic Transducer to Study CuO Doped Thin Films
Autorzy:: Barakat, M. A. Y.
Powiązania:: https://bibliotekanauki.pl/articles/176534.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: ultrasonic
thin films
doping
microstructure
wedge
Opis:: Ultrasonic pulse echo technique was used to study cupric oxide (CuO) thin films. CuO thin films were prepared using sol gel technique. They were doped with Lithium (Li) (1%, 2% and 4%). Thin films’ thickness (d) and band gap energy (E_g) were measured. In addition, elastic moduli (longitudinal (L), shear (G), bulk (K) and Young’s (E)) and Poisson’s ratio (v) were determined to estimate the microstructure properties of the prepared films. The study ameliorated the used transducers to overcome their dead zone and beam scattering; wedges were developed. The results showed the effectiveness of these wedges. They enhanced transducers’ sensitivity by changing the dead zone, beam diameter, beam directivity and waves’ transmission. Also, the study noted that Li doping caused the improvement of CuO thin films to be more useful in solar cell fabrication. Li-CuO thin films had narrower band gap. Thus, they acquired a high quantum yield for the excited carriers; also they gained more efficiency to absorb solar light.
Źródło:: Archives of Acoustics; 2018, 43, 3; 487-495
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 38.

Tytuł:: Contribution of TiN/Ti/a-C:H multilayers architecture to biological and mechanical properties
Autorzy:: Major, L.
Lackner, J. M.
Kot, M.
Janusz, M.
Major, B.
Powiązania:: https://bibliotekanauki.pl/articles/200944.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: microstructure
smooth muscle cells adhesion
cracking
Opis:: Complex microstructure analysis of TiN/Ti/a-C:H multilayer coatings, subjected to mechanical and biological tests, were performed by means of transmission electron microscopy (TEM) and confocal scanning laser microscopy (CSLM), respectively. Influence of interface numbers and phase ratios on coating properties was studied. Thin films were fabricated by a hybrid PLD technique (PLD supported by magnetron sputtering). The a-C:H phase was characterized by an amorphous structure, while TiN was built of columnar crystallites. Multilayer coatings contained sequentially deposited TiN and a-C:H layers with thin metallic Ti inter- layers deposited at each interface. Mechanisms of mechanical wear of analyzed systems were presented focusing on the cracking propagation revealed in the scratch test. Biological tests were done basing on smooth muscle cells adhesion to coating surfaces. An increase of TiN phase in the coating led to improvement of mechanical properties, while the carbon phase improved the biological behavior. Coatings comprising a higher rate of the carbon (a-C:H) revealed brittleness and were prone to delaminating. Optimal properties from the mechanical and biological point of view were stated for 8xTiN/Ti/a-C:H coating with 1:1 phase ratio (TiN to a-C:H).
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 3; 565-570
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 39.

Tytuł:: Influence of Solution Heat Treatment on Phase Composition and Structure of ZnAl40Cu(1-2)Ti(1-2) Alloys
Autorzy:: Michalik, R.
Powiązania:: https://bibliotekanauki.pl/articles/352321.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Zn-Al alloy
microstructure
phase composition
Opis:: Zn-Al-Cu alloys are characterised by very good tribological properties: high resistances to abrasive wear and adhesive wear, resistance to dry friction, low friction coefficient. Important disadvantages of Zn-Al alloys include, among others low structural and dimensional instability in as-cast stage and during long-period after pouring into moulds. Studies carried out in recent years confirm the problem of dimensional instability of Zn-Al-Cu alloys may be reduced by replace copper partially with titanium. The goal of the studies carried out was to define the influence of heat treatment on the microstructure and phase composition of ZnAl40Cu(1-2)Ti(1-2) alloys. The scope of the investigations included analysis of the phase composition, tests using a scanning electron microscope and a scanning transmission electron microscope, and X-ray microanalysis. The studies carried out indicate a presence of the e-CuZn₅ and Ti₂ZnAl₅, Al_xCu_yTi_z phases in the ZnAl40Cu(1-2)Ti(1-2) alloys.
Źródło:: Archives of Metallurgy and Materials; 2018, 63, 1; 461-466
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 40.

Tytuł:: Influence of Intensification Factors on Quality of Fe Agglomerates Made with Alternative Fuel
Autorzy:: Semanová, Z.
Legemza, J.
Hrubovčáková, M.
Findorák, R.
Fröhlichová, M.
Powiązania:: https://bibliotekanauki.pl/articles/352355.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: processing
sintering
intensification
microstructure
agglomerate
fuel
Opis:: Currently is the biggest problem of metallurgical companies the increase of fossil fuel prices and strict environmental regulations. As a result of this, companies must look for alternatives that would reduce the amount of fossil fuels and reduce emissions. Wood sawdust has huge energy potential, which can be used in the process of agglomerate production. This type of energy is locally available, has some similar properties as fossil fuels and is economically advantageous. For these reasons, experimental study using laboratory agglomeration pan was realized to study the possibility of agglomerate production with a mixed fuel. Experimental results show the viability of mixed fuel use in the agglomeration process, but also show significant possibility for improvement. The maximum acceptable substitution ratio, which corresponds to qualitatively suitable agglomerate is 20% of pine sawdust. Based on the realized experiments and the obtained results we have acceded to the intensification of the agglomeration process with an objective to increase the amount of added substitution fuel while maintaining the required quality of agglomerate.
Źródło:: Archives of Metallurgy and Materials; 2018, 63, 4; 1853-1857
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 41.

Tytuł:: Microstructure and Properties of TIG Surfacing Co-Based Alloy on UMCo50 Process Burner
Autorzy:: Xue, Haitao
Luan, Xiaoping
Guo, Weibing
Zhou, Dong
Powiązania:: https://bibliotekanauki.pl/articles/2048805.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: UMCo50 alloy
surfacing
microstructure
properties
Opis:: The surfacing layer of cobalt-based alloy is prepared using the tungsten inert gas welding (TIG) process and employing the UMCo50, ST1 and ST6 filler materials. The metallographic testing, hardness, wear and corrosion testing of different surfacing layers have been carried out. Each area of the surfacing layer is characterized using the optical and scanning electron microscope (SEM). Cellular and a few columnar dendrites have been observed near the fusion line of the UMCo50 surfacing layer, and cellular structure is observed in the central region. Dendrites and cellular crystals have been observed in the ST1 and ST6 surfacing layers. The average hardness of UMCo50, ST1 and ST6 surfacing layers are 320 HV, 672.3 HV and 497.5 HV, respectively. The wear loss of the ST1, ST6 and UMCo50 surfacing layer is 2.71 mg, 4.35 mg, and 14.57 mg, respectively. The corrosion weight loss of the ST1, ST6 and UMCo50 surfacing layers are 0.0388 g, 0.0477 g and 0.0833 g, respectively.
Źródło:: Archives of Metallurgy and Materials; 2022, 67, 1; 17-30
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 42.

Tytuł:: Densification and Magnetic Properties of Fe Powder Compacts According to Heat-Treatment Conditions
Autorzy:: Yoo, Hyo-Sang
Kim, Yong-Ho
Kim, Cheol-Woo
Son, Hyeon-Taek
Powiązania:: https://bibliotekanauki.pl/articles/2203721.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Fe powder
heat-treatment
microstructure
density
Opis:: In this study, the effects of heat-treatment conditions of Fe powder compacts on densification, microstructure, strength and magnetic properties were investigated. The prepared Fe powder was compressed in a mold of diameter 20 mm at a pressure of 800 MPa for 30 sec. This Fe powder compact was heat-treated under different atmospheres (air and 90% Ar + 10% H2 and heat-treatment temperatures (300 and 700℃). The Fe powder compacts heat-treated in an Ar+H2 mixed gas atmosphere showed a denser microstructure and higher density than the Fe powder compacts heat-treated in an air atmosphere. Oxygen content in the heat-treatment conditions played a signiﬁcant role in the improvement of the densiﬁcation and magnetic properties.
Źródło:: Archives of Metallurgy and Materials; 2023, 68, 1; 47--50
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 43.

Tytuł:: Effect of Boron Accompanied by Chromium, Vanadium and Titanium on the Transformation Temperatures of Low-Alloy Cast Steels
Autorzy:: Białobrzeska, Beata
Dziurka, Rafał
Powiązania:: https://bibliotekanauki.pl/articles/2203729.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: boron
cast steels
dilatometric research
microstructure
Opis:: The purpose of the research was to examine the influence of boron on the selected properties of low-alloy cast steels. The chemical compositions of the cast steels were designed especially for this study to contain different alloy elements. The first composition lacked significant alloying elements. The subsequent grades of cast steels had the addition of chrome, chrome with vanadium, and chrome with titanium. It was decided to investigate the influence of boron in the presence of such alloying additives on the temperature of phase transformations. On the basis of dilatometric curves, the characteristic temperatures of the phase transformations were determined. Additionally, to assess the influence of the cooling rate on the structure of cast steels, an analysis of their microstructure, after full annealing and quenching, was carried out.
Źródło:: Archives of Metallurgy and Materials; 2023, 68, 1; 257--267
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 44.

Tytuł:: Enamel microstructure of the Late Cretaceous multituberculate mammal Kogaionon
Autorzy:: Fosse, G
Radulescu, C.
Samson, P.M.
Powiązania:: https://bibliotekanauki.pl/articles/22612.pdf
Data publikacji:: 2001
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: Hainina
Paleocene
mammal
Late Cretaceous
Cretaceous
Romania
tooth
microstructure
multituberculate
Taeniolabis
Kogaionon
enamel microstructure
Europe
Źródło:: Acta Palaeontologica Polonica; 2001, 46, 3
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 45.

Tytuł:: Seed microstructure and genetic variation of characters in selected grass-pea mutants [Lathyrus sativus L.]
Autorzy:: Rybinski, W.
Blaszczak, W.
Fornal, J.
Powiązania:: https://bibliotekanauki.pl/articles/25396.pdf
Data publikacji:: 2006
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:: microstructure
seed microstructure
plant property
Lathyrus sativus
selected mutant
grass pea
mutant
chemomutagenesis
seed
genetic variation
Źródło:: International Agrophysics; 2006, 20, 4
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 46.

Tytuł:: Ordering of alfa-FeCo phase in the nanocrystalline Fe83-xCoxNb3B13Cu1 (x = 6, 25 or 41.5) alloy
Autorzy:: Zbroszczyk, J.
Młyńczyk, A.
Olszewski, J.
Ciurzyńska, W.
Wysłocki, B.
Perduta, K.
Lelątko, J.
Nabiałek, M.
Powiązania:: https://bibliotekanauki.pl/articles/148219.pdf
Data publikacji:: 2007
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: nanocrystalline alloys
microstructure
ordering
Mössbauer spectroscopy
Opis:: The microstructure and ordering of alfa-FeCo phase of the nanocrystalline Fe83 xCoxNb3B13Cu1 (x = 6, 25 or 41.5) alloys were investigated. We have stated that á-FeCo phase is atomically ordered in the Fe83 xCoxNb3B13Cu1 (x = 25 or 41.5) samples crystallized by the heat treatment in a furnace. However, after flash annealing (by current or laser) that phase is disordered. Moreover, we have found that Co concentration in the crystalline alfa-FeCo phase strongly depends on Co content in the as-quenched ribbons. The annealing conditions influence also the grain diameter of the crystalline phase. In the nanocrystalline alloys obtained by a flash annealing of the amorphous ribbons finer grains are present.
Źródło:: Nukleonika; 2007, 52, supl. 1; 29-32
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 47.

Tytuł:: Numerical and experimental study of real foam microstructure models
Autorzy:: Miedzińska, A.
Szymczyk, W.
Powiązania:: https://bibliotekanauki.pl/articles/246346.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: microstructure
aluminium foam
3D scanning
Opis:: Metal foams are new, as yet imperfectly characterized, class of materials with low densities and novel physical, mechanical, thermal, electrical and acoustic properties. They offer a potential for lightweight structures, for energy absorption, and for thermal management; and at least some of them are cheap. Such characteristics have been appreciated by the automotive industry in the aspect of crash and impact phenomenon. Energy absorption capacity of foams under dynamic load was analytically confirmed based on a rigid-perfectly plastic-locking foam model. In this paper the development process of a real closed cell foam microstructure based on finite element model with the use of SD scanning is shown. Computed tomography (CT) is a medical imaging method employing tomography created by computer processing. Digital geometry processing is used to generale a three-dimensional image of the inside of an object from a large series of two-dimensional X-ray images taken around a single axis of rotation. The numerical analyses carried out with the usage of LS Dyna computer code of the quasi static and dynamic compression tests are presented. The most important mechanisms and phenomena that appeared in the microstructural sample are described. In the final part of these investigations the comparison process between numerical and experimental test was performed. The results confirmed the good correspondence between both tests.
Źródło:: Journal of KONES; 2010, 17, 2; 309-314
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 48.

Tytuł:: Microstructure and electromagnetic properties of microwave sintered CoCuZn ferrites
Autorzy:: Patankar, K. K.
Powiązania:: https://bibliotekanauki.pl/articles/411554.pdf
Data publikacji:: 2014
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: ferrite
microwave sintering
Microstructure
electromagnetic
inductors
Opis:: Co-Cu-Zn ferrite material has been extensively used in multilayer chip inductors because of their good electromagnetic properties at higher frequencies and low sintering temperatures. In this research work, a comparative study on Co-Cu-Zn ferrite prepared from two different routes is reported. The two different routes are conventional ceramic sintering method (CS) and is microwave sintered (MS) method. The former route is most commonly used while the latter one is now gaining popularity in sintering processes. The work highlights that the sintering temperature and time were significantly reduced from 4 h and 1250 °C for the CS process to 20 min and 900 °C for MS process. Moreover, microwave sintering also improves the physical and electromagnetic properties of ferrite.
Źródło:: International Letters of Chemistry, Physics and Astronomy; 2014, 1; 1-8
2299-3843
Pojawia się w:: International Letters of Chemistry, Physics and Astronomy
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 49.

Tytuł:: Wpływ długotrwałego oddziaływania temperatury i naprężenia na trwałość eksploatacyjną stali HR3C i jej jednorodnego złącza spawanego
Effect of long-term exposure to temperature and stress on the service life of the HR3C steel and its homogeneous welded joint
Autorzy:: Zieliński, A.
Dobrzański, J.
Rozmus, R.
Kania, Z.
Powiązania:: https://bibliotekanauki.pl/articles/182118.pdf
Data publikacji:: 2017
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Metalurgii Żelaza im. Stanisława Staszica
Tematy:: pełzanie
mikrostruktura
wydzielenia
creep
microstructure
precipitations
Opis:: Stal HR3C jest nową stalą przeznaczoną do budowy elementów ciśnieniowych kotłów o nadkrytycznych parametrach pracy. W stali tej podczas eksploatacji w podwyższonej temperaturze, dzięki dodatkom Cr, Nb i N wydzielają się związki typu MX, NbCrN i M23C6, co prowadzi do zmiany właściwości mechanicznych. W pracy przedstawiono wyniki badań mikrostruktury po starzeniu tej stali w temperaturze 650, 700 i 750°C w czasie do 10 000 godz. Badania mikrostruktury przeprowadzono przy użyciu skaningowej i transmisyjnej mikroskopii elektronowej. Identyfikację jakościową i ilościową występujących wydzieleń wykonano metodą rentgenowskiej analizy fazowej. Opisano wpływ podwyższonej temperatury na zmiany w mikrostrukturze badanej stali. Przeprowadzono skrócone próby pełzania. Uzyskane wyniki stanowią podstawę charakterystyk materiałowych stali nowej generacji, które są wykorzystane w diagnostyce materiałowej elementów części ciśnieniowej kotłów energetycznych.
HR3C steel is a new steel designed for the construction of pressure components for boilers with supercritical performance. In this steel, during operation at elevated temperatures, the compounds MX, NbCrN and M23C6 are released due to the addition of Cr, Nb and N, leading to a change in mechanical properties. The paper presents the results of microstructure studies after ageing of this steel at 650, 700 and 750°C for up to 10,000 hours. Microstructure studies were carried out using scanning and transmission electron microscopy. Qualitative and quantitative identification of the occurring precipitations was carried out using X-ray phase analysis. The effect of elevated temperature on chan ges in the microstructure of the investigated steel is described. Shortened creep tests were carried out. The obtained results are the basis for material characteristics of the new generation steel used in material diagnostics of pressure components of power boilers.
Źródło:: Prace Instytutu Metalurgii Żelaza; 2017, T. 69, nr 2, 2; 48-57
0137-9941
Pojawia się w:: Prace Instytutu Metalurgii Żelaza
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 50.

Tytuł:: Numerical analysis of soil settlement prediction and its application in large-scale marine reclamation artificial island project
Autorzy:: Zhao, J.
Bao, L.
Wang, G.
Powiązania:: https://bibliotekanauki.pl/articles/259183.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: microstructure
consolidation
creep
artificial island
settlement
Opis:: In an artificial island construction project based on the large-scale marine reclamation land, the soil settlement is a key to affect the late safe operation of the whole field. To analyze the factors of the soil settlement in a marine reclamation project, the SEM method in the soil micro-structural analysis method is used to test and study six soil samples such as the representative silt, mucky silty clay, silty clay and clay in the area. The structural characteristics that affect the soil settlement are obtained by observing the SEM charts at different depths. By combining numerical calculation method of Terzaghi’s one-dimensional and Biot’s two-dimensional consolidation theory, the one-dimensional and two-dimensional creep models are established and the numerical calculation results of two consolidation theories are compared in order to predict the maximum settlement of the soils 100 years after completion. The analysis results indicate that the micro-structural characteristics are the essential factor to affect the settlement in this area. Based on numerical analysis of one-dimensional and two-dimensional settlement, the settlement law and trend obtained by two numerical analysis method is similar. The analysis of this paper can provide reference and guidance to the project related to the marine reclamation land.
Źródło:: Polish Maritime Research; 2017, S 3; 4-11
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 51.

Tytuł:: Influence of Cu Addition and Austempering Treatment on Mechanical Properties and Microstructure of GGG 50
Autorzy:: Kilinc, B.
Kirtay, S.
Powiązania:: https://bibliotekanauki.pl/articles/1031936.pdf
Data publikacji:: 2017-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: austempering
cast iron
mechanical properties
microstructure
Opis:: An investigation was carried out to examine the effect of austempering on the microstructure and mechanical properties of nodular cast iron GGG 50 (DIN EN 1563) alloyed with different amount of copper. Optical, scanning electron microscopy and energy dispersive spectroscopy analyses were performed for microstructural characterization. In addition, hardness and tensile tests were carried out for mechanical properties determination. Specimens were austenitized at 900°C for an hour, then austempered for an hour at 330°C in salt bath and cooled at a room temperature in air. The results indicated that the addition of Cu to GGG 50 encouraged pearlite formation in the matrix structure. In addition, with the austempering heat treatment, the structure was transformed from ferrite + pearlite into ausferrite and retain austenite. Furthermore, for the alloy with 2 wt% Cu addition, it was noted that the graphite nodules diverged from sphericity and Cu was concentrated around the graphite. After austempering, mechanical properties were significantly improved and the highest mechanical properties were found at 1.5 wt% Cu.
Źródło:: Acta Physica Polonica A; 2017, 132, 3; 461-465
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 52.

Tytuł:: Microstructure of Friction Stir Welded Dissimilar Wrought 2017A and Cast AlSi9Mg Aluminum Alloys
Autorzy:: Kopyściański, M.
Dymek, S.
Hamilton, C.
Węglowska, A.
Pietras, A.
Szczepanek, M.
Wojnarowska, M.
Powiązania:: https://bibliotekanauki.pl/articles/1032926.pdf
Data publikacji:: 2017-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: friction stir welding
aluminum alloys
microstructure
Opis:: Friction stir welding was applied to join dissimilar aluminum alloys: wrought 2017A and cast AlSi9Mg. The produced weldment was free from cracks and any discontinuities. The weld microstructure was composed of alternating bands of the welded alloys; however, the alloy that was placed on the advancing side (AlSi9Mg) dominated the weld center. The grain size within the particular bands was similar in both alloys. The hardness profile reflected the microstructure formed during welding. The weld microstructure as well as the shape of hardness profile across the weld were justified by numerical simulation of material flow during welding.
Źródło:: Acta Physica Polonica A; 2017, 131, 5; 1390-1393
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 53.

Tytuł:: Numerical modeling of porous ceramics microstructure
Autorzy:: Miedzińska, Danuta
Powiązania:: https://bibliotekanauki.pl/articles/298116.pdf
Data publikacji:: 2019
Wydawca:: Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:: porous ceramics
finite element method
microstructure
Opis:: The presented research is directed to the porous ceramics microstructural behaviour assessment with the use of numerical methods. Such new material can be used for thermal insulation, filters, bio-scaffolds for tissue engineering, and preforms for composite fabrication. One of the newest and most interesting applications, considered in this work, is a usage of those materials for production of proppants for hydraulic fracturing of shale rocks. The hydraulic fracturing is a method of gas recovery from unconventional reservoirs. A large amount of fracturing fluid mixed with proppant (small particles of sand or ceramics) is pumped into the wellbore and its pressure causes the rock cracking and gas release. After fracturing the fluid is removed from the developed cracks leaving the proppant supporting the fracture. In the paper the grain porous ceramics which is used for proppant particles preparation was studied. The influence of grains distribution on the porous ceramics mechanical behaviour during compression was simulated with the use of finite element method.
Źródło:: Technical Sciences / University of Warmia and Mazury in Olsztyn; 2019, 22(1); 5-17
1505-4675
2083-4527
Pojawia się w:: Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 54.

Tytuł:: A Simulation and Experimental Investigation of the Thermal Characteristics of Refractory Bricks Produced Using Fireclay and Agroforestry Wastes
Autorzy:: Obidiegwu, Eugenia Obiageli
Esezobor, David Ehigie
Mgbemere, Henry Ekene
Odili, Cletus Chiosa
Powiązania:: https://bibliotekanauki.pl/articles/2105205.pdf
Data publikacji:: 2022
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: simulation
insulating bricks
microstructure
thermal characteristics
Opis:: Manufacturing and processing industries usually consume large quantities of materials and energy in the course of their operations. The energy supplied for high-temperature processes are used partially for the actual technical process and between 30 to 40% of the energy escapes through the walls of the reactor into the atmosphere, leading to a high degree of thermal inefficiency and fuel consumption. This paper studies the thermal behaviour of insulating refractory bricks produced from a blend of fireclay and agroforestry wastes. The fireclays used were obtained from Ukpor deposit in Anambra State (Latitude 5.95°N, Longitude 6.92°E), Osiele deposit in Abeokuta, Ogun State (Latitude 7.18°N, Longitude 3.45°E) and Kankara Katsina State (Latitude 11.93°N, Longitude 7.41°E), all of which are in Nigeria. Samples were prepared with various weight percentages (60–100 wt.%) clays and (0–40 wt.%) of agroforestry waste, with grain sizes between 212 and 600 µm. Raw materials and the developed refractory bricks were characterised using appropriate standard techniques. The chemical, mineralogical constituents and phases present in the microstructure were examined. Physical and thermo-mechanical properties were investigated. The insulating refractory bricks developed have porosity of 78.83% , cold crushing strength (CCS) 3.144 kN/m2 and thermal conductivity 0.04–0.046 W/(m∙K) that compare favourably with imported bricks 75–85%, 2.756 kN/m2 and 0.049 W/(m∙K) in both physical, mechanical and thermal properties respectively. The reason is that the agroforestry waste used (coconut shell), served to create the pores that improve insulation after burning. Also the ash that remains serves as reinforcement to improve the mechanical properties. The thermal behaviour of the bricks was studied using Finite Element Method and shows a strong correlation with the experimental findings. This indicates that the produced insulating bricks have the thermal properties required for insulation of furnaces.
Źródło:: Journal of Casting & Materials Engineering; 2022, 6, 2; 45--57
2543-9901
Pojawia się w:: Journal of Casting & Materials Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 55.

Tytuł:: Influence of Annealing Treatment on Deep Drawing Behavior of Q235 Carbon Steel /410/304 Stainless Steels Three-Layer Composite Plate
Autorzy:: Lv, Zehua
Zhang, Zhixiong
Han, Jianchao
Wang, Tao
Powiązania:: https://bibliotekanauki.pl/articles/2106574.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: composite plate
deep drawing
annealing
microstructure
Opis:: Effect of annealing treatment on deep drawing behavior of hot-rolled Q235 carbon steel/410/304 stainless steel three-layer composite plate was investigated. Deep drawability of the unannealed composite plates exhibits a sharp difference for various contact surfaces with the die. The limit drawing ratio (LDR) of the composite plate with the carbon steel contacting the die is 1.75, while it is 1.83 with the stainless steel contacting the die due to the different mechanical responses to the tensile stress at the corner of the die. After annealing at 900°C for 2 h, however, the deep drawabilities of the composite plates both for various contact surfaces with the die are significantly improved and becomes almost identical, which are attributed to the stress relief, the enhanced ductility and the improved interface bonding strength of the hot-rolled component plates during annealing.
Źródło:: Archives of Metallurgy and Materials; 2022, 67, 2; 421--433
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 56.

Tytuł:: Development of Empirical Relationships for Prediction of Mechanical and Wear Behavior of Copper Matrix Surface Composite by Friction Stir Processing Technique
Autorzy:: Saravanakumar, S.
Gopalakrishnan, Saravanan
Kalaiselvan, K.
Powiązania:: https://bibliotekanauki.pl/articles/2049739.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: friction stir processing
microstructure
microhardness
wear
Opis:: In this investigation, Copper Matrix Surface Composites (CMSCs) were reinforced with various ceramic particles like Aluminum Nitrate (AlN), Titanium diboride (TiB2), and Rice Husk Ash (RHA) are used to increase the metallurgical and mechanical properties by Friction Stir Processing (FSP). The Design of the Experiment (DOE) Taguchi L9 orthogonal array method was used. The process parameters considered were groove width and various types of reinforcement particles. The fabrication of CMSCs was achieved by using optimized process parameters, such as the tool transverse speed of 40 mm/min, rotational tool speed of 1000 rpm, and an axial load of 10 kN with one pass. The influence of FSP process parameters on CMSCs in the stir zone is observed through optical microscope (OM), Field Emission Scanning Electron Microscope (FESEM), and Transmission Electron Microscope (TEM). Mechanical properties such as microhardness and wear rate are studied and compared. It reveals that good interfacial bonding was produced between ceramic particles in CMSCs. TiB2 reinforced with copper matrix surface composites enhance microhardness and had a lesser wear rate.
Źródło:: Archives of Metallurgy and Materials; 2021, 66, 2; 617-626
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 57.

Tytuł:: LMO Ceramics Microstructure
Autorzy:: Bruś, B.
Zarycka, A.
Powiązania:: https://bibliotekanauki.pl/articles/350959.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: LMO
microstructure
hot pressing
free sintering
Opis:: The aim of this work was to characterize the microstructure of LMO type ceramics. The ceramics obtained by the free sintering at two temperatures 1473 K and 1573 K and two sintering times 6 and 12 h was the test material. One series was also obtained by the hot pressing method for a comparison. In all the cases the material synthesis was conducted by the solid-state reaction method at 1173 for 24 h. Photographs of the specimen fractures were taken by a scanning electron microscope to characterize the microstructure of the ceramics obtained in a more detailed way. The VISILOG 4 system, enabling to calculate a lot of parameters characterizing the material microstructure, such as e.g.: a number of grains on the unit area, an average grain size, shape indexes of the grains in question, was used as well. It allows determining a grain size distribution, and a frequency of presence of grains with the specific shape index. By analyzing a set of the parameters obtained an influence of the technological conditions on the microstructure of the material in question, and on its properties and applicability at the same time can be determined.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 2A; 857-862
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 58.

Tytuł:: The fixed-effects analysis of the relation between SDAS and carbides for the airfoil blade traces
Autorzy:: Pietraszek, J.
Szczotok, A.
Radek, N.
Powiązania:: https://bibliotekanauki.pl/articles/351316.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: microstructure
SDAS
IN713C
superalloy
Opis:: The primary objective was to test a usefulness of the specific fixed-effect model for the analysis of quantitative relationships gathered from the image analysis of the material microstructures. The dataset was obtained from the investigation of turbine blades made from superalloy IN713C. The analysis based on the general linear model resulted in informative plots revealing mutual relationships between secondary dendrite arm spacing and the mean plane section area of carbides in the material. Directions for further research also were obtained.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 1; 235-239
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 59.

Tytuł:: Contribution of titanium, chromium and carbon buffer interlayers to bio-tribological properties of multilayer composites
Autorzy:: Major, Ł.
Janusz, M.
Lackner, J. M.
Major, B.
Powiązania:: https://bibliotekanauki.pl/articles/352343.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: bio-tribological coatings
wear mechanism
microstructure
Opis:: Research studies on bio-tribological protective coatings of titanium, chromium and carbon based have been performed. Thin films were fabricated by hybrid PLD technique (PLD supported by magnetron sputtering). Coatings consisted of two parts; the inner part (first from the substrate) in each case was formed by titanium or chromium/titanium nitride or chromium nitride (Ti/TiN or Cr/Cr₂N). The outer part was formed by pure DLC or multilayer DLC'Ti or Cr. No delamination was found at the interface. Titanium or chromium metallic layer was deposited as a first layer directly on the metallic substrate to avoid delamination. All individual layers were built of columnar nano- crystallites. Mechanisms of the mechanical wear of analyzed systems were presented, focusing on the cracking propagation in ball-on-disc tests using an 1 N and 5 N applied loads for 5 000 cycles. Complex microstmcture analysis of presented nano-multilayer coatings, before and after mechanical tests, were performed by means of transmission electron microscopy (TEM). The highest stress concentration during mechanical uploading was moved through the multilayer coating by breaking only one layer at the time. The microstructure characterization revealed that cracking propagating in the outer part of the coating was stopped at the interface. In the case of the inner part of the coating Ti/TiN; Cr/Cr₂N, ceramic layers showed brittle cracking, while metallic (Ti or Cr) ones deformed plastically. Fabricated coatings were subjected under the analysis in the biomechanical system optimized to test for the direct contact with a human whole blood. The study considered physiological conditions mainly related to the temperature and humidity and the frequency of cyclic deformation of the artificial vessel into which the tested sample was introduced.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 3; 1391-1398
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 60.

Tytuł:: Preparation and Evaluation of Properties of Cast Metallic Foams with Regular Inner Structure
Autorzy:: Lichý, P.
Elbel, T.
Kroupová, I.
Radkovský, F.
Powiązania:: https://bibliotekanauki.pl/articles/353931.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: metallic foams
casting
microstructure
mechanical properties
Opis:: Lately we encounter still more new applications of metallic foams, as well as possible methods of their manufacture. These metallic materials have specific properties, such as large rigidity at low density, in some cases high thermal conductivity, capability to absorb energy, etc. The work is focused on the preparation of these materials using conventional casting technology, which ensures rapid and economically feasible method for production of shaped components. In the experimental part we studied conditions of casting of metallic foams with a regular structure made of ferrous and non-ferrous alloys. For thus obtained castings we evaluated the achieved microstructure and mechanical properties, which determine the possible use of these materials. The samples were subjected to compression tests, by which we investigated deformation behaviour of selected materials and determined the value of energy absorption.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 3; 1643-1646
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 61.

Tytuł:: A Comparative Study of Residual Stress and Mechanical Properties for FSW and TIG Weld on Structural Steel
Autorzy:: Chaurasia, P. K.
Pandey, C.
Giri, A.
Saini, N.
Mahapatra, M. M.
Powiązania:: https://bibliotekanauki.pl/articles/354742.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: FSW
TIG
residual stress
microstructure
hardness
Opis:: Mechanical properties and residual stresses of friction stir welded and autogenous tungsten inert gas welded structural steel butt welds have been studied. Friction stir welding (FSW) of structural steel butt joints has been carried out by in-house prepared tungsten carbide tool with 20 mm/min welding speed and 931 rpm tool rotation. Tungsten inert gas (TIG) welding of the butt joints was carried out with welding current, arc voltage and the welding speed of 140 amp, 12 V and 90 mm/min respectively. Residual stress measurement in the butt welds has been carried out in weld fusion zone and heat affected zone (HAZ) by using blind hole drilling method. The magnitude of longitudinal residual stress along the weld line of TIG welded joints were observed to be higher than friction stir welded joint. In both TIG and FSW joints, the nature of longitudinal stress in the base metal was observed to be compressive whereas in HAZ was observed to be tensile. It can be stated that butt welds produced with FSW process had residual stress much lower than the autogenous TIG welds.
Źródło:: Archives of Metallurgy and Materials; 2018, 63, 2; 1019-1029
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 62.

Tytuł:: The Analysis of Deformation and Forecasting Microstructure in the Forging Process of the X6CrNiTi18-10 Austenitic Steel
Autorzy:: Kukuryk, M.
Powiązania:: https://bibliotekanauki.pl/articles/352789.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: hot forging
austenitic steel
FEM
microstructure
Opis:: The paper presents the analysis of the three-dimensional strain state for the cogging process of a forging (type: shaft) of the X6CrNiTi18-10 austenitic steel with the application of the finite element method. The results of the thermal-mechanical simulation of the hot cogging process on flat and shaped anvils, taking under consideration boundary conditions applied in industrial practice, are presented. In the research, a new method of forging, consisting in the introduction of the initial forging of the stock on anvils which have convex work surfaces, and further forging on shaped anvils, was applied. The results of the calculations make it possible to determine effective strain distribution, effective stress, mean stresses and temperature in the volume of a forging. The solution was supplemented by the addition of the model of microstructure development in the course of deformation. The conducted research constitutes the basis for determining the best possible technological process of the initial forging of a cast ingot, and provide the possibility of forecasting the deformations and parameters of the microstructure.
Źródło:: Archives of Metallurgy and Materials; 2018, 63, 1; 393-401
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 63.

Tytuł:: The Comparison of the Microstructure and Corrosion Resistance of Sand Cast Aluminum Alloys
Autorzy:: Dobkowska, A.
Adamczyk–Cieślak, B.
Mizera, J.
Kurzydłowski, K. J.
Kiełbus, A.
Powiązania:: https://bibliotekanauki.pl/articles/352870.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: aluminium-silicon-magnesium alloys
microstructure
corrosion
Opis:: The influence of different types of precipitation on the corrosion behavior was investigated in three aluminum-siliconmagnesium alloys. The microstructures of the alloys were studied through optical (OM) and scanning electron microscopy (SEM). The structures consisted of an α-Al solid solution matrix, Si eutectic crystals, secondary phases AlFeSi and AlMgFeSi (Chinese script), as well as Mg₂Si. The corrosion behavior was examined with the use of a potentiodynamic polarization test followed by a SEM surface analysis. The results indicate that all the analyzed samples were in the passive state and AlSi10Mg was less reactive in the corrosive environment.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 1; 209-212
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 64.

Tytuł:: Effect of Thermal Treatment of Biomedical Ti-6Al-4V Alloy on Corrosion Resistance in Simulated Physiological Solutions
Autorzy:: Ryba, J.
Kawalec, M.
Tyrała, E.
Krawiec, H.
Powiązania:: https://bibliotekanauki.pl/articles/353015.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: titanium alloys
corrosion
heat treatment
microstructure
Opis:: The effect of heat treatment on the corrosion resistance of Ti-6Al-4V alloy was investigated in the artificial saliva solution (MAS). It has been revealed that the thermal annealing treatment temperature favors the cathodic reactions and reduce the protective properties of passive film. The heat treatment causes the enrichment of β phase in vanadium. The lowest corrosion resistance in the artificial saliva revealed the Ti-6Al-4V alloy heated for 2 hours at 950°C. Heterogeneous distribution of vanadium within the β phase decreases the corrosion resistance of the Ti-6Al-4V.
Źródło:: Archives of Metallurgy and Materials; 2020, 65, 1; 39-45
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 65.

Tytuł:: Treatment of a collapsible soil using a bentonite–cement mixture
Autorzy:: Bellil, S.
Abbeche, K.
Bahloul, O.
Powiązania:: https://bibliotekanauki.pl/articles/178573.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: collapsible soil
cement
bentonite
microstructure
oedometer
Opis:: The study of collapsible soils that are generally encountered in arid and semi-arid regions remains a major issue for geotechnical engineers. This experimental study, carried out on soils reconstituted in the laboratory, aims firstly to present a method of reducing the collapse potential to an acceptable level by treating them with different levels of bentonite–cement mixture while maintaining the water content and degree of compactness, thus reducing eventual risks for the structures implanted on these soils. Furthermore, a microscopic study using scanning electron microscopy was carried out to explore the microstructure of the soil in order to have an idea of the phenomena before and after treatment. The results show that treatment with a bentonite–cement mixture improves the geotechnical and mechanical characteristics, modifies the chemical composition of the soil, reduces the collapse potential and the consistency limits. The microstructural study and the X-ray energy dispersive spectroscopy analysis clearly illustrate an association of elementary particles in the soil aggregates, whereby the arrangement of these aggregates leads to the formation of a dense and stable material.
Źródło:: Studia Geotechnica et Mechanica; 2018, 40, 4; 233-243
0137-6365
2083-831X
Pojawia się w:: Studia Geotechnica et Mechanica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 66.

Tytuł:: Polish Artificial Heart - new coatings, technology, diagnostics
Autorzy:: Sarna, J.
Kustosz, R.
Major, R.
Lackner, J.
Major, B.
Powiązania:: https://bibliotekanauki.pl/articles/200025.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: pulsed laser deposition
microstructure
cell adhesion
Opis:: Since 1991, the Foundation for Cardiac Surgery Development in Zabrze has been implementing research on the artificial heart. In 1995, an artificial ventricle, POLVAD, was implanted to a patient, and in 1998, the prototype of a clinical controller, POLPDU-401, was created. A further development of the studies on an implantable artificial heart requires an integrated approach and an application of advanced methods of materials sciences in order to develop new materials suitable for the contact with blood, as well as to apply a multilateral biomedical diagnostics in hydrodynamic conditions. The estimation of the cell–material interaction plays an important role in the biomaterial design. An analysis of the influence of the carbon content in titanium nitride on the biological and biophysical properties of biomaterial coatings was studied. The cell-material reactions were considered in dynamic and static conditions. Three groups of materials were under examinations – titanium nitride (TiN), as well as titanium carbonitride with a low and high carbon content – of which the best properties were observed for TiN. We found a strong influence of the stoichiometry of TiN (atomic ratio of Ti/N) on the biocompatibility. A non-stoichiometric TiN could have a negative influence on the surrounding tissue.
Źródło:: Bulletin of the Polish Academy of Sciences. Technical Sciences; 2010, 58, 2; 329-335
0239-7528
Pojawia się w:: Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 67.

Tytuł:: Effect of chitosan film surface structure on the contact angle
Autorzy:: Jagodzińska, Sylwia
Pałys, Beata
Wawro, Dariusz
Powiązania:: https://bibliotekanauki.pl/articles/2131497.pdf
Data publikacji:: 2021
Wydawca:: Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:: cellulose
chitosan
contact angle
films
microstructure
Opis:: The aim of this study was to evaluate the influence of the surface microstructure of chitosan films on the contact angle. Films without plasticising additives made of chitosan or regenerated chitosan were selected for the tests. A sessile drop method based on the European Pharmacopoeia was used to determine the contact angle. Due to the method of film production, the contact angle measurements were made on both the top and bottom surfaces of the film. For chitosan or regenerated chitosan films, the method of preparation slightly affected the difference in wettability between the top and bottom of the films, as confirmed by scanning electron microscopy. On the other hand, the wettability of the top and bottom of cellulose films varied greatly depending on the side of the film. Both chitosan and cellulose films had a homogeneous structure. There were differences in the microstructure between the top and the bottom of the sample in the cellulose film, a factor that affected the contact angle and thus the wettability of the surface.
Źródło:: Progress on Chemistry and Application of Chitin and its Derivatives; 2021, 26; 89-100
1896-5644
Pojawia się w:: Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 68.

Tytuł:: FFT-based simulation using a reduced set of frequencies adapted to the underlying microstructure
Autorzy:: Gierden, Christian
Waimann, Johanna
Svendsen, Bob
Reese, Stefanie
Powiązania:: https://bibliotekanauki.pl/articles/29520101.pdf
Data publikacji:: 2021
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: microstructure simulation
FFT
model order reduction
composites
Opis:: Instead of the classical finite element (FE) based microstructure simulation, a Fast Fourier transform (FFT) based microstructure simulation, introduced by Moulinec and Suquet (1994, 1998), also enables the computation of highly resolved microstructural fields. In this context, the microscopic boundary value problem is captured by the Lippmann-Schwinger equation and solved by using Fast Fourier transforms (FFT) and fixed-point iterations. To decrease the computational effort of the fixed-point solver, Kochmann et al. (2019) introduced a model order reduction (MOR) technique based on solving the Lippmann-Schwinger equation in Fourier space with a reduced set of frequencies. Thereby, the accuracy of this MOR technique depends on the number of used frequencies and the choice of frequencies that are considered within the simulation. Instead of the earlier proposed fixed (Kochmann et al., 2019) or geometrically adapted (Gierden et al., 2021b) sampling patterns, we propose a sampling pattern which is updated after each load step based on the current strain. To show the precision of such a strain-based sampling pattern, an elasto-plastic two-phase composite microstructure is investigated.
Źródło:: Computer Methods in Materials Science; 2021, 21, 1; 51-58
2720-4081
2720-3948
Pojawia się w:: Computer Methods in Materials Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 69.

Tytuł:: An efficient Monte Carlo Potts method for the grain growth simulation of single-phase systems
Autorzy:: Maazi, Noureddine
Lezzar, Balahouane
Powiązania:: https://bibliotekanauki.pl/articles/29520251.pdf
Data publikacji:: 2020
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: alloys
crystal growth
Monte Carlo simulation
microstructure
Opis:: The choice of the lattice sites to be reoriented in the Monte Carlo Potts algorithm for grain growth simulation is repeated in a non-homogeneous way. Therefore, some grains are favorably growing than others. This fact may seriously affect the simulation results. So a modified MC method is presented. Lattice sites are selected for reorientation one by one following their positions in the matrix in each Monte Carlo step (mcs). This approach ensures that the various selections of one lattice site within every mcs are eliminated, and no favorable growth of grains at the expense of others. The calculation time considerably decreases. The effect of real-time and physical temperature on the grain growth kinetics is discussed.
Źródło:: Computer Methods in Materials Science; 2020, 20, 3; 85-94
2720-4081
2720-3948
Pojawia się w:: Computer Methods in Materials Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 70.

Tytuł:: Optimization of T-6 cycle and Characterization of Si3N4 Reinforced High Strength Aluminum Metal Matrix Composites
Autorzy:: Kumar, Ashish
Rana, Ravindra Singh
Purohit, Rajesh
Namdev, Anurag
Powiązania:: https://bibliotekanauki.pl/articles/28099516.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: stir casting
microstructure
mechanical properties
optimization
fractography
Opis:: In this research, AA7068/Si3N4 composites were fabricated through stir casting with the attachment of ultrasonic treatment. The quenching medium and aging duration significantly influenced the hardness of Al alloy samples. Peak hardness was achieved after 12 h of artificial aging at the temperature of 140°C. The addition of nano Si3N4 significantly refined the microstructure of unreinforced AA7068. The dispersion of intermetallic compounds (MgZn2) and grain boundary discontinuation were noticed after the T-6 heat treatment. Ultimate tensile strength, yield strength, and hardness were improved by 70.95%, 76.19%, and 44.33%, respectively, with the addition of 1.5 weight % Si3N4 compared to as-cast alloy due to the combined effect of heat treatment, hall-Petch, Orowan, thermal miss match, load-bearing strengthening mechanisms and uniform dispersion of reinforcement. A reduction in percentage elongation was noticed due to composites’ brittle nature by the effect of ceramic Si3N4 particles’ inclusion. The fracture surfaces reveal ductile failure for alloy and mixed-mode failure in the case of composites.
Źródło:: Archives of Metallurgy and Materials; 2023, 68, 2; 775--783
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 71.

Tytuł:: Soft Chemistry - Synthesis of Nano-Titanium-Doped-Tellerium-Cadmium for Solar Cell Applications
Autorzy:: Elsabawy, Khaled M.
Powiązania:: https://bibliotekanauki.pl/articles/1192983.pdf
Data publikacji:: 2016
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Sol-Gel
Hydrolysis
AFM
XRD
Microstructure
SEM
Opis:: Soft chemistry procedures through sol–gel technique has applied to synthesize nano- Ti-doped CdTe composite. Gels were synthesized by the hydrolysis of a complex solution of Si(OC2H5)4, Cd(CH3COO)2•2H2O, Ti(CH3COO)4 and Te were heated from 350 to 600 °C in a H2─N2 atmosphere to form fine cubic CdTe doped crystals. The size of CdTe crystals, determined from the line broadening of X-ray diffraction pattern, increases from 6 to 21 nm in diameter with increasing heat-treatment temperature. Micro-structural features of Ti-doped CdTe crystals were characterized by both of AFM and SEM investigations . The analysis of micro-structural micrographs of both of SEM and AFM indicated that titanium additions improved the crystal growth of grain towards more lower grain size which ranged in between 1.4-2.5 μm while 0.67 μm through Scherrer’s calculations.
Źródło:: World Scientific News; 2016, 36; 61-72
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 72.

Tytuł:: Laser modified functional carbon-based coatings on titanium substrate for cardiac tissue integration and blood clotting inhibition
Autorzy:: Major, Roman
Ostrowski, Roman
Surmiak, Marcin
Trembecka-Wójciga, Klaudia
Lackner, Jurgen
Powiązania:: https://bibliotekanauki.pl/articles/1844973.pdf
Data publikacji:: 2020
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:: thin layers
migration channels
laser ablation
microstructure
Opis:: The work focused on developing functional coatings on titanium substrates that would facilitate the integration with the cardiac tissue and with a specific form of connective tissue like blood. Surface modifications consisted in the laser evaporation of part of the biocompatible layer, thus creating a suitable environment for a particular tissue. For the myocardium integration, the metal surface was refined by biohemocompatible coatings. Such surfaces were the starting point for further modifications in the form of channels. The channeled surfaces enabled a controlled cell migration and proliferation. The interaction of endothelial cells with the material was highly dependent on the surface characteristics such as: topography, microstructure or mechanical properties. The controlled cellular response was achieved by modifying the surface to obtain a network of wells or channels of different dimensions via the laser interference lithography. This technique determined a high resolution shape, size and distribution patterns. As a result, it was possible to control cells in the scale corresponding to biological processes. The surface periodization ensured the optimal flow of oxygen and nutrients within the biomaterial, which was of a key importance for the cell adhesion and proliferation. The work attempted at producing the surface networks mimicking natural blood vessels. To stimulate the formation of new blood vessel the finishing resorbable synthetic coatings were applied on the surface to act as a drug carrier. Therefore, the initial trial to introduce factors stimulating the blood vessels growth was performed.
Źródło:: Engineering of Biomaterials; 2020, 23, 155; 22-31
1429-7248
Pojawia się w:: Engineering of Biomaterials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 73.

Tytuł:: Effect of Al2O3 decoration on the opto-electrical properties of a porous Si/Cr2O3 composite
Autorzy:: Ghrib, Mondher
Tlili, B.
Razeg, M.
Ouertani, R.
Gaidi, M.
Ezzaouia, H.
Powiązania:: https://bibliotekanauki.pl/articles/1818241.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:: porous Si
microstructure
optical and electrical properties
Opis:: In this work, we present an extensive investigation of the effect of Al₂O₃ decoration on the morphological, structural and opto-electronic properties of a porous Si (Sip)/Cr₂O₃ composite. The Sip layers were prepared by the anodization method. Al₂O₃ and Cr₂O₃ thin films were deposited by physical vapour deposition. The morphological and micro-structural properties of Sip/Cr₂O₃/Al₂O₃ were studied using the scanning electron microscope, energy dispersive X-ray spectroscopy and X-ray diffraction techniques. It was found that Al₂O₃ decoration with different concentration strongly affects the Sip/Cr₂O₃ microstructure mainly at the level of porosity. Variable angle spectroscopic ellipsometry demonstrates a strong correlation between optical constants (n and k) of Sip/Cr₂O₃/Al₂O₃ and microstructure properties. Dielectric properties of Sip/Cr₂O₃/Al₂O₃ such as electrical conductivity and conduction mechanism were explored using impedance spectroscopy over the temperature interval ranging from 340 to 410°C. A semiconductor to the metallic transition has been observed at high frequency.
Źródło:: Opto-Electronics Review; 2020, 28, 3; 155 --163
1230-3402
Pojawia się w:: Opto-Electronics Review
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 74.

Tytuł:: Assessment of structure of plate implants used in mandibular osteosynthees
Ocena struktury implantów płytkowych stosowanych do zespoleń żuchwy
Autorzy:: Szust, A.
Dudziński, W.
Szalkowska, M.
Powiązania:: https://bibliotekanauki.pl/articles/261795.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Wrocławska. Wydział Podstawowych Problemów Techniki. Katedra Inżynierii Biomedycznej
Tematy:: plate implant
microstructure
SEM
implant płytkowy
mikrostruktura
Opis:: Titanium plate implants used in osteotomy and osteosynthesis of mandible were studied. These medical procedures are planned and their goal is shortening or extending the ramus of mandible. Material used for manufacturing of miniplates – titanium and its alloys – is a basic biomaterial. In this paper, we present results of macro- and microscopic examination of mini plates made from technically pure titanium – grade 2. These are typical implants used in mandible osteosynthesis. Straight 4- and 5-hole plates and partially open 6-hole plate were investigated. Structural analysis was conducted on used plates – removed from patient’s body after completion of treatment or in result of plate fracture during treatment. Comparative microstructure examination of brand new, unused plates was also conducted.
Przedmiotem badań były tytanowe implanty płytkowe stosowane do zabiegów osteotomii i osteosyntezy kości żuchwy. Zabieg taki jest zabiegiem planowanym, mającym na celu skrócenie lub wydłużenie gałęzi kości żuchwy. Materiał stosowany do wytwarzania minipłytek, tytan i jego stopy, jest podstawowym materiałem z grupy biomateriałów używanych do produkcji implantów. W pracy przedstawiono wyniki badań makroi mikroskopowych mini płytek wykonanych z czystego technicznie tytanu – grade 2. Były to typowe implanty stosowane do osteosyntezy kości żuchwy. Przebadano płytki proste 4 i 5 oczkowe, oraz płytkę częściowo otwartą 6 oczkową. Analiza strukturalna została przeprowadzona na płytkach używanych – usuniętych z ciała pacjenta po zakończeniu leczenia, lub na skutek pęknięcia płytki w czasie trwania leczenia. Wykonano także badania porównawcze dla takich samych płytek nowych.
Źródło:: Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna; 2016, 22, 3; 172-179
1234-5563
Pojawia się w:: Acta Bio-Optica et Informatica Medica. Inżynieria Biomedyczna
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 75.

Tytuł:: Microstructure analysis in the creep process of a gas turbine blade of the turbine engine
Autorzy:: Błachnio, J.
Kułaszka, A.
Ziętara, M.
Czyrska-Filemonowicz, A.
Powiązania:: https://bibliotekanauki.pl/articles/133291.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Naukowe Silników Spalinowych
Tematy:: turbine engine
turbine blade
loads
microstructure
rafting
Opis:: The technical condition of gas turbine blades of the turbine engine has a significant impact on the reliability and life span of the turbine and the entire engine. In order to assess the blades’ technical condition, a visual method, with the use of optoelectronic devices, is used. In order to verify this assessment, metallographic tests are conducted. The paper presents the results of microstructural tests of the turbine rotor blades made of nickel-based monocrystalline super alloys. The aim of these tests was to determine the consequences of impacting high exhaust gas temperature and stresses occurring during operation on the stability of the blade microstructure. The progress level of the blade microstructure changes in the post-operational stage for different sections towards the blade vertical axis and was compared with the blade microstructure on delivery made of the same super alloy. A varied degree of the microstructure degradation for different blade sections was shown. The changes typical of the high-temperature creep process – γ' phase directional growth (rafting), were observed only for the thinnest walls of the upper section of the turbine blade leaf.
Źródło:: Combustion Engines; 2016, 55, 2; 41-45
2300-9896
2658-1442
Pojawia się w:: Combustion Engines
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 76.

Tytuł:: Microstructure and Mechanical Properties of Friction Stir Welded Joints between Commercially Pure Copper and Al 6351 Alloy
Autorzy:: Sinha, V. C.
Kundu, S.
Chatterjee, S.
Powiązania:: https://bibliotekanauki.pl/articles/350852.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: friction stir welding
tensile strength
microstructure
intermetallics
Opis:: In the present study, the effect of tool rotational speed on microstructure and mechanical properties of friction stir welded joints between commercially pure copper and 6351 Al alloy was carried out in the range of tool rotational speeds of 300-900 rpm in steps of 150 rpm at 30 mm/minutes travel speed. Up to 450 rpm, the interface of the joints is free from intermetallics and Al₄ Cu₉ intermetallic has been observed at the stir zone. However, Al₄ Cu₉ intermetallic was observed both at the interface and the stir zone at 600 rpm. At 750 and 900 rpm tool rotational speed, the layers of AlCu, Al₂ Cu₃ and Al₄ Cu₉ intermetallics were observed at the interface and only Al₄ Cu₉ intermetallics has been observed in the stir zone. The maximum ultimate tensile strength of ~207 MPa and yield strength of ~168 MPa along with ~6.2% elongation at fracture of the joint have been obtained when processed at 450 rpm tool rotational speed.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 3; 1819-1825
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 77.

Tytuł:: Modification of Aluminium-Silicon Near-Eutectic Alloy with Use of Electrolysis of Sodium Salt
Autorzy:: Białobrzeski, A.
Pezda, J.
Jarco, A.
Powiązania:: https://bibliotekanauki.pl/articles/351019.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Al-Si alloys
electrolysis
tensile strength
microstructure
Opis:: The present work discusses results of preliminary tests concerning the technology of continuous dosage of sodium to a metallic bath from the aspect of modification of EN AC-44200 alloy, through the use of a multiple compound (salt) of sodium. The technology consists in continuous electrolysis of sodium salts occurring directly in a crucible with liquid alloy. As a measure of the degree of alloy modification over the course of testing, the ultimate tensile strength (UTS or Rm) and analysis of microstructure are taken, which confirm the obtained effects of the modification on the investigated alloy. Assurance of stable parameters during the process of continuous modification with sodium, taking into consideration the fact of complex physical-chemical phenomena, requires additional tests aimed at their optimization and determination of a possibility of implementation of such technology in metallurgical processes.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 4; 2371-2374
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 78.

Tytuł:: Influence of Mg Addition on Crystallisation Kinetics and Structure of the Zn-Al-Cu Alloy
Autorzy:: Krupiński, M.
Labisz, K.
Tański, T.
Krupińska, B.
Król, M.
Polok-Rubiniec, M.
Powiązania:: https://bibliotekanauki.pl/articles/351696.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: casting
metallography
modification
cast zinc alloys
microstructure
Opis:: In this work the effect of Mg addition on structure as well as kinetics of crystallisation of Zn-Al-Cu cast alloy was presented. To the zinc alloy was added 0.1% mass of Mg. The alloy was cast into a metal mould. Thermo-derivative analysis was performed using the UMSA platform (Universal Metallurgical Simulator and Analyzer). The investigated alloys were freely cooled down with a rate of 0.1°C s^-1. For the structure analysis were used results obtained using light microscopy, scanning and transmission electron microscopy.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 2A; 785-790
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 79.

Tytuł:: Effect of Thermomechanical Controlled Processing and Quenching & Tempering on the Structure and Properties of Bainite-Martensite Steels
Autorzy:: Mandal, G.
Ghosh, S. K.
Chatterjee, S.
Powiązania:: https://bibliotekanauki.pl/articles/353508.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: steels
TMCP
heat treatment
microstructure
mechanical properties
Opis:: In the present time, advanced high strength steel (AHSS) has secured a dominant place in the automobile sector due to its high strength and good toughness along with the reduced weight of car body which results in increased fuel efficiency, controlled emission of greenhouse gases and increased passengers’ safety. In the present study, four new advanced high strength steels (AHSS) have been developed using three different processing routes, i.e., thermomechanical controlled processing (TMCP), quenching treatment (Q_T ), and quenching & tempering (Q&T) processes, respectively. The current steels have achieved a better combination of the high level of strength with reasonable ductility in case of TMCP as compared to the other processing conditions. The achievable ultrahigh strength is primarily attributed to mixed microstructure comprising lower bainite and lath martensite as well as grain refinement and precipitation hardening.
Źródło:: Archives of Metallurgy and Materials; 2020, 65, 2; 861-868
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 80.

Tytuł:: The Influence of Treatment Parameters on the Microstructure, Properties and Bend Angle of Laser Formed Construction Bars
Autorzy:: Kurp, P.
Mucha, Z.
Tofil, S.
Mulczyk, K.
Powiązania:: https://bibliotekanauki.pl/articles/353966.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: laser forming
laser treatment
microstructure
Fourier number
Opis:: In this paper, the authors presented the research on laser formed construction bars made of C20 steel on the example of the T-shape. The CO₂ TRUMPF TruFlow 6000 laser was used in the research. The influence of the laser treatment parameters (the power and speed of the heat source) on the volume of the bend angle, structure and properties of the elements (hardness and tensile strength) was examined. On the basis of the results obtained from the conducted experiments, the authors suggested a way of selecting treatment parameters so that the element should meet the strength assumptions at the allowable time of its implementation.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 2B; 1151-1156
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 81.

Tytuł:: Microstructure and properties of tin bronzes produced by the SPD method
Autorzy:: Sobota, J.
Rodak, K.
Nowak, M.
Powiązania:: https://bibliotekanauki.pl/articles/355126.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: tin bronzes
KOBO
microstructure
mechanical properties
corrosion
Opis:: In this article the structural and mechanical properties of grain refinement of Cu-Sn alloys with tin content of 10%, 15% and 20% using the KOBO method have been presented. The direct extrusion by KOBO (name from the combination of the first two letters of the names of its inventors – A. Korbel and W. Bochniak) method employs, during the course of the whole process, a phenomenon of permanent change of strain travel, realized by a periodical, two-sided, plastic metal torsion. Moreover the aim of this work was to study corrosion resistance. The microstructure investigations were performed using an optical microscope Olimpus GX71, a scanning electron microscope (SEM) and a scanning transmission electron microscope (STEM). The mechanical properties were determined with INSTRON 4505/5500 machine. Corrosion tests were performed using «Autolab» set – potentiostat/galvanostat from EcoChemie B.V. with GPES software ver. 4.9. The obtained results showed possibility of KOBO deformation of Cu-Sn casting alloys. KOBO processing contributed to the refinement of grains and improved mechanical properties of the alloys. The addition of tin significantly improved the hardness. Meanwhile, with the increase of tin content the tensile strength and yield strength of alloys decrease gradually. Ductility is controlled by eutectoid composition and especially δ phase, because they initiate nucleation of void at the particle/matrix interface. No significant differences in the corrosion resistance between cast and KOBO processed materials were found.
Źródło:: Archives of Metallurgy and Materials; 2019, 64, 1; 95-102
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 82.

Tytuł:: Forecasting the Particle Diameter Size Distribution in P92 (X10CrWMoVNb9-2) Steel After Long-Term Ageing at 600 and 650°C
Autorzy:: Zieliński, A.
Sroka, M.
Miczka, M.
Śliwa, A.
Powiązania:: https://bibliotekanauki.pl/articles/355265.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: P92 steel
microstructure
precipitates
statistics
forecasting
Opis:: The investigations on microstructure of P92 steel in the as-received condition and after 10⁵h ageing at 600 and 650°C were carried out. For the recorded images of microstructure, the quantitative analysis of precipitates was performed. On that basis, a statistical analysis of collected data was made with the aim of estimating parameters of selected theoretical statistical distribution. Then, the forecast for average precipitate diameter and standard deviation of such a distribution for the time of 1,5*10⁵h at 600 and 650°C was calculated. The obtained results of investigations confirm the possibility of using, in evaluation of degradation degree for materials in use, the forecasting methods derived from mathematical statistics, in particular the theory of stochastic processes and methods of forecasting by analogy.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 2A; 753-760
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 83.

Tytuł:: The equal channel angular extrusion process of multiphase high strength aluminium bronze
Proces równokanałowego wyciskania kątowego wysokowytrzymałych wielofazowych brązów aluminiowych
Autorzy:: Gronostajski, Z.
Hawryluk, M.
Kuziak, R.
Radwański, K.
Skubiszewski, T.
Zwierzchowski, M.
Powiązania:: https://bibliotekanauki.pl/articles/355856.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: aluminium bronzes
ECAP
strain
microstructure
grain size
Opis:: The aim of the research was to determine the deformation condition of ECAP process of multiphase high strength aluminium bronze BA1032. The studies have indicated that it is possible to deform multiphase aluminium bronze BA1032 in the ECAP process at a temperature of 400°C and die angle Φ=110°. The deformation of the bronzes at lower temperatures encounters some difficulties - cracks appear which make repeated ECAP impossible. The cracks appear on the top surface of the samples where it contacts the surface of the outlet channel. FEM simulations show that the largest plastic strains occur in this area. The proposed ECAP method of large plastic deformations as applied to the investigated aluminium bronzes makes it possible to obtain very strong refinement especially of eutectoid α+ γ2.
Celem pracy było określenie warunków odkształcania w procesie ECAP wysokowytrzymałych wielofazowych brązów aluminiowych. Przeprowadzone badania wskazują na możliwość odkształcania wielofazowych brazów aluminiowych w tym procesie w temperaturze 400 °C dla kąta matrycy Φ=110°. Pewne trudności sprawia odkształcanie brązu w niższych temperaturach, gdyż pojawiają się wówczas pęknięcia, które uniemożliwiają prowadzenie procesu wielokrotnego przeciskania próbek przez kanał katowy. Pęknięcia pojawiaja sie na górnej powierzchni próbek w miejscu kontaktu z powierzchnią kanału wyjsciowego. Jak wykazuje symulacje MES w miejscu tym występują największe odkształcenia plastyczne. Zastosowana metoda dużych odkształceń plastycznych ECAP w przypadku badanych brazów aluminiowych pozwala uzyskać bardzo silne rozdrobnienie głównie eutektoidu α+ γ 2.
Źródło:: Archives of Metallurgy and Materials; 2012, 57, 4; 897-909
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 84.

Tytuł:: Influence of die forging parameters on the microstructure and phase composition of Inconel 718 alloy
Wpływ warunków kucia matrycowego na mikrostrukturę oraz skład fazowy stopu Inconel 718
Autorzy:: Bunsch, A.
Kowalska, J.
Witkowska, M.
Powiązania:: https://bibliotekanauki.pl/articles/355862.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Inconel 718
microstructure
texture
phase analysis
recrystallization
Opis:: The object of the present investigation was Inconel 718 alloy. The material in the initial state and after forging at the temperatures of 1100°C and 1000°C was examined. Diffraction analyses indicate that a nickel-based γ solid solution is a dominating phase in the alloy (so-called nickel austenite). Apart from a solid solution, which constitutes the matrix, certain volume fractions of the other phase were detected e.g. δ phase and carbides. It was found that, due to thermo-mechanical-treatment at both temperatures, the phase composition of Inconel 718 was considerably changed in comparison to the initial state. On the contrary, differences in the temperature of forging did not significantly influence the alloy constitution. However, both of the temperatures of forging result in distinct texture intensity. Microstructure observations indicate that forging at 1000C° led to recrystallization by creation of the new recrystallizated grains near or on the grain boundaries of existing deformed grains. After forging at 1100°C, the microstructure was fully recrystallized at the whole volume of the material.
W pracy przedstawiono wyniki badan wykonanych na stopie niklu Inconel 718. Przebadano materiał w stanie wyjściowym i po kuciu w temperaturach 1100 i 1000°C. Wykonane badania dyfrakcyjne wskazują, ze faza dominującą w stopie jest faza γ roztwór Fe w Ni, często nazywany austenitem niklowym. Oprócz tej fazy, w stopie występują takie fazy jak δ oraz węgliki. Proces kucia w porównaniu do stanu wyjściowego wpływa na skład fazowy (następuje rozpuszczenie niektórych faz i być może przesycenie osnowy), natomiast różnica w temperaturze przeróbki plastycznej nie wpłynęła znacząco na skład fazowy. Obserwacje mikrostruktury wskazują, ze kucie w temperaturze 1100°C prowadzi do pełnej rekrystalizacji dynamicznej, zaś w temperaturze 1000°C rekrystalizacja zachodzi tylko poprzez tworzenie nowych ziarn na granicach ziarn lub w obszarach przy granicach istniejących odkształconych ziarn. Równocześnie, obserwuje się różnice w stopniu steksturowania materiału.
Źródło:: Archives of Metallurgy and Materials; 2012, 57, 4; 929-935
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 85.

Tytuł:: Effect of Variable Manganese Content on Microstructure of Al-Cu Alloys
Autorzy:: Stąpór, S.
Górny, M.
Kawalec, M.
Gracz, B.
Powiązania:: https://bibliotekanauki.pl/articles/355992.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Al-Cu-Mn alloys
microstructure
macrostructure
DSC
Opis:: The presented access the influence of Mn content (0-0.94 wt.%) on the course of the cooling curves, phase transformation, macrostructure, and microstructure of Al-Cu alloys for three series: initial (Series I), with the addition of an AlTi master (Series II), and modified with AlTi5B1 (Series III). The maximum degree of undercooling ΔT was determined based on the cooling curves. The surface density of the grains (N_A ) was determined and associated with the inverse of solidification interval 1/ΔT_k . Titanium (contained in the charge materials as well as the modifier) has a significant effect on the grinding of the primary grains in the tested alloys. A DSC thermal analysis allowed for the determination of phase transition temperatures under conditions close to equilibrium. For series II and III, the number of grains decreases above 0.2 wt.% Mn with a simultaneous increase in solidification interval 1/ΔT₂ . The presence of Al₂ Cu eutectics as well as the Cu-, Fe-, and Mn-containing phases in the examined samples was demonstrated using scanning electron microscopy.
Źródło:: Archives of Metallurgy and Materials; 2020, 65, 4; 1377-1383
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 86.

Tytuł:: Fabrication and Investigation of Thermal and Wear Properties of Zinc Novel Coatings Reinforced with Nano-Al2O3 and Cr2O3 Particles
Autorzy:: Popoola, A. P. I.
Malatji, N.
Fayomi, O. S. I.
Powiązania:: https://bibliotekanauki.pl/articles/356056.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: microstructure
corrosion
nanocomposite coatings
thermal stability
tribology
Opis:: The study of the thermal, wear and corrosion properties of developed nanocomposite coatings of Zn-Al₂O₃ and Zn-Cr₂O₃ was carried out. The coatings were produced by electrodeposition technique from chloride acidic bath. Laboratory tube furnace was used for the thermal analysis. The wear test was performed using CETR tribo-tester dry reciprocating tester. The hardness properties were investigated using diamond base Dura microhardness tester. Scanning electron microscope (SEM) affixed with energy dispersive spectrometry was used to study the morphological characteristics, before and after wear deformation. The corrosion degradation behavior was observed using linear polarization technique in 3.5% NaCl. In all the interaction, the effects of the incorporated Al₂O₃ and Cr₂O₃ nanoparticulates on zinc rich coatings were found to have an excellent influence on the wear, corrosion and thermal stability properties. The fabrication and properties exhibited by the alloys were therefore found to be satisfactory and shows good predictability and applicability.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 3; 1671-1676
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 87.

Tytuł:: Influence of Ceramic Particles on the Microstructure and Mechanical Properties of SAC305 Lead-Free Soldering Material
Autorzy:: Kumar, Manoj Pal
Gergely, G.
Koncz-Horvath, D.
Gacsi, Z.
Powiązania:: https://bibliotekanauki.pl/articles/356293.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: composite solder
SiC particles
microstructure
wettability
microhardness
Opis:: In this study, silicon carbide (SiC) reinforced lead-free solder (SAC305) was prepared by the powder metallurgy method. In this method SAC305 powder and SiC powder were milled, compressed and sintered to prepare composite solder. The composite solders were characterized by optical and scanning electron microscopy for the microstructural investigation and mechanical test. Addition of 1.5 wt.% and 2 wt.% ceramic reinforcement to the composite increased compressive strengths and microhardness up to 38% and 68% compared to those of the monolithic sample. In addition, the ceramic particles caused an up to 55% decrease in the wetting angle between the substrate and the composite solder and porosity was always increased with increase of SiC particles.
Źródło:: Archives of Metallurgy and Materials; 2019, 64, 2; 603-606
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 88.

Tytuł:: Manufacturing and Wear Properties of SiC Coating Layer on Zr alloy Fabricated by Vacuum Kinetic Spray Process
Autorzy:: Ham, Gi-Su
Kim, Kyu-Sik
Lee, Kee-Ahn
Powiązania:: https://bibliotekanauki.pl/articles/356701.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: vacuum kinetic spray
silicon carbide
microstructure
wear
Opis:: This study manufactured a SiC coating layer using the vacuum kinetic spray process and investigated its microstructure and wear properties. SiC powder feedstock with a angular shape and average particle size of 37.4 μm was used to manufacture an SiC coating layer at room temperature in two different process conditions (with different degrees of vacuum). The thickness of the manufactured coating layers were approximately 82.4 μm and 129.4 μm, forming a very thick coating layers. The SiC coating layers consisted of α-SiC and β-SiC phases, which are identical to the feedstock. Cross-sectional observation confirmed that the SiC coating layer formed a dense structure. In order to investigate the wear properties, ball crater tests were performed. The wear test results confirmed that the SiC coating layer with the best wear resistance achieved approximately 4.16 times greater wear resistance compared to the Zr alloy. This study observed the wear surface of the vacuum kinetic sprayed SiC coating layer and identified its wear mechanism. In addition, the potential applications of the SiC coating layer manufactured using the new process were also discussed.
Źródło:: Archives of Metallurgy and Materials; 2019, 64, 2; 519-523
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 89.

Tytuł:: Analiza polsko-rosyjskich i rosyjsko-polskich słowników specjalistycznych wydanych w latach 1990–2012
Autorzy:: Klejnowska-Borowska, Martyna
Powiązania:: https://bibliotekanauki.pl/articles/546128.pdf
Data publikacji:: 2014
Wydawca:: Uniwersytet w Białymstoku. Wydawnictwo Uniwersytetu w Białymstoku
Tematy:: terminography
terminographic analysis
bilingual dictionaries
macrostructure
microstructure
Opis:: Martyna Klejnowska-Borowska - Uniwersytet Warszawski. Analiza przedstawiona w niniejszym artykule została oparta na modelu analizy terminograficznej autorstwa M. Łukasika (2007, 2010), który badał polsko-angielskie i angielsko-polskie słowniki specjalistyczne wydane w latach 1990–2006. Autor przeanalizował około 600 słowników dwu- i wielojęzycznych, dzięki czemu powstała adnotowana bibliografia. Ponadto dzięki badaniom opracowana została typologia słowników specjalistycznych, a dzięki analizie kwantytatywnej wykryte zostały lakuny terminograficzne w zakresie języka polskiego i angielskiego na polskim rynku wydawniczym. Innym ważnym rezultatem badania okazało się opracowanie prototypu najbardziej popularnego dzieła terminograficznego w zakresie polsko-angielskiej i angielsko-polskiej terminografii.
The article presents the analysis of Polish-Russian and Russian-Polish terminological dictionaries published in Poland between 1990 and 2012. The paper is divided into three parts. The first part presents the analysis of macrostructure parameters which, inter alia, included: the way the lexicon is organized: alphabetically or thematically; language format; dictionary type (glossaries, dictionaries of acronyms, terminological dictionaries: explanatory terminological dictionaries, encyclopedic terminological dictionaries, hybrid terminological dictionaries and thesauruses); bibliography references; indexes; attachments; size of a dictionary and its thematic scope; field(s) of science included in dictionaries. The second part deals with microstructure parameters such as: grammatical information, the dictionary definitions, accent marks. Finally, some faults of the analyzed terminological dictionaries are revealed.
Настоящая статья посвящена анализу польско-русских и русско-польских терминологи- ческих словарей изданных в Польше в 1990–2012 гг. Статья состоит из трех частей. В первой части представлен анализ таких параметров макроструктуры словаря как: расположение словарных статей (алфавитный или тематический порядок); языковой формат; вид словаря (глоссарий, словарь акронимов, терминологический словарь: объяснительный терминологический словарь, энциклопедический терминологический словарь, гибридный терминологический словарь, тезаурус); библиография; индексы; приложения; объем словаря и его предмет; отрасли, которые охватывает словарь. Вторая часть посвящена анализу параметров микроструктуры, к которым относятся: грамматическая информация; дефиниция; ударение. Последняя часть представляет ошибки, выступающие в проанализированных терминологических словарях.
Źródło:: Linguodidactica; 2014, 18
1731-6332
Pojawia się w:: Linguodidactica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 90.

Tytuł:: Macrostructures and microstructures of multilingual LSP dictionaries
Autorzy:: Zagórska, Anna
Powiązania:: https://bibliotekanauki.pl/articles/463472.pdf
Data publikacji:: 2017
Wydawca:: Uniwersytet Warszawski. Wydział Lingwistyki Stosowanej
Tematy:: Lexicography
macrostucture
microstructure
multilingual dictionary
LSP dictionary
Opis:: The aim of the present article is to provide an overview on selected macrostructural and microstructural choices made by the authors of multilingual LSP dictionaries. Particular attention is devoted to the headwords and the arrangement and content of dictionary entries. The above-mentioned questions are discussed based on several multilingual LSP dictionaries which have been published in Poland in 1991– 2012.
Źródło:: Lingwistyka Stosowana / Applied Linguistics / Angewandte Linguistik; 2017, 21; 187-199
2080-4814
Pojawia się w:: Lingwistyka Stosowana / Applied Linguistics / Angewandte Linguistik
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 91.

Tytuł:: An analysis of abstracts in medical and economics journals: Microstructure and practical applications
Autorzy:: Mureşan, Oana
Kic-Drgas, Joanna
Powiązania:: https://bibliotekanauki.pl/articles/911967.pdf
Data publikacji:: 2019-07-29
Wydawca:: Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:: abstract
LSP
ESP
microstructure
economics
medicine
journal
Opis:: Writing abstracts, both in a professional and academic environment, is a crucialskill, reflecting the ability to think synthetically and express thoughts in a concise way. Due to the rising popularity of indexing scientific papers in different databases, abstracts can determine the readability of a paper and its future quotation rate. This paper presents the results of an analysis of the microstructure of 40 abstracts from prestigious impact factor medical and economics journals, offering guidelines for designing abstract writing exercises in foreign language courses for specific purposes
Źródło:: Glottodidactica. An International Journal of Applied Linguistics; 2019, 46, 1; 109-125
0072-4769
Pojawia się w:: Glottodidactica. An International Journal of Applied Linguistics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 92.

Tytuł:: Quality of Multilingual Specialised Lexicography in Poland
Autorzy:: Łukasik, Marek Wojciech
Powiązania:: https://bibliotekanauki.pl/articles/677094.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Instytut Slawistyki PAN
Tematy:: terminography
macrostructure
microstructure
metaterminography
metalexicography
multilingual
dictionary
Opis:: Quality of Multilingual Specialised Lexicography in PolandThe aim of this paper is to evaluate the state of multilingual specialised lexicography in Poland over a period of almost 70 years. Based on the analysis of macro- and microstructures of multilingual dictionaries published in Poland since 1945, the study offers a thorough insight into the key parameters of such works, including their general lexicographic structure, presentation of the content as well as potential usefulness for users. Compared with the achievements of theoretical lexicography, the terminographic analysis has enabled the author to draw meaningful conclusions and put forward applicative proposals for future dictionaries.
Źródło:: Cognitive Studies; 2015, 15
2392-2397
Pojawia się w:: Cognitive Studies
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 93.

Tytuł:: Microstructure of Hot-Deformed Cu-3Ti Alloy
Autorzy:: Szkliniarz, A.
Szkliniarz, W.
Blacha, L.
Siwiec, G.
Powiązania:: https://bibliotekanauki.pl/articles/352283.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: copper-titanium alloy
hot deformation
microstructure
recrystallization
Opis:: In the paper, results of investigations regarding temperature and strain rate effects on hot-deformed Cu-3Ti alloy microstructure are presented. Evaluation of the alloy microstructure was performed with the use of a Gleeble HDS-V40 thermal-mechanical simulator on samples subjected to uniaxial hot compression within 700 to 900ºC and at the strain rate of 0.1, 1.0 or 10.0 s^-1 until 70% (1.2) strain. It was found that within the analyzed temperature and strain rate ranges, the alloy deformation led to partial or complete recrystallization of its structure and to multiple refinement of the initial grains. The recrystallization level and the average diameter of recrystallized grains increase with growing temperature and strain rate. It was shown that entirely recrystallized, fine-grained alloy structure could be obtained following deformation at the strain rate of min 10.0 s^-1 and the temperature of 800°C or higher.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 1; 347-352
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 94.

Tytuł:: Growth and Characterisation of Pulsed-Laser Deposited Tin Thin Films on Cube-Textured Copper at Different Temperatures
Autorzy:: Szwachta, G.
Gajewska, M.
Kąc, S.
Powiązania:: https://bibliotekanauki.pl/articles/352365.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: thin films
coated conductors
deposition
PLD
microstructure
Opis:: High-quality titanium nitride thin films have been grown on a cube-textured copper surface via pulsed laser deposition. The growth of TiN thin films has been very sensitive to pre-treatment procedure and substrate temperature. It is difficult to grow heteroexpitaxial TiN films directly on copper tape due to large differences in lattice constants, thermal expansion coefficients of the two materials as well as polycrystalline structure of substrate. The X-Ray diffraction measurement revealed presence of high peaks belonged to TiN(200) and TiN(111) thin films, depending on used etcher of copper surface. The electron diffraction patterns of TiN(200)/Cu films confirmed the single-crystal nature of the films with cube-on-cube epitaxy. The high-resolution microscopy on our films revealed sharp interfaces between copper and titanium nitride with no presence of interfacial reaction.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 2B; 1031-1038
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 95.

Tytuł:: Study on Improvement of Surface Properties of Low Carbon Steel Using Laser Cladding
Autorzy:: Kim, Cheol-Woo
Yoo, Hyo-Sang
Jeon, Jae-Yeol
Cho, Kyun-Taek
Choi, Se-Weon
Powiązania:: https://bibliotekanauki.pl/articles/2048888.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: laser cladding
vickers hardness
microstructure
surface treatment
Opis:: Laser cladding is a method that can be applied to repair the crack and break on the mold and die surfaces, as well as generate new attributes on the surface to improve toughness, hardness, and corrosion resistance. It is used to extend the life of the mold. It also has the advantages of superior bonding strength and precision coating on a local area compared with the conventional thermal spraying technology. In this study, we investigated the effect of cladding on low carbon alloy steel using 18%Cr-2.5%Ni-Fe powder (Rockit404), which showed high hardness on the die surface. The process conditions were performed in an argon atmosphere using a diode laser source specialized for 900-1070 nm, and the output conditions were 5, 6, and 10 kW, respectively. After the cladding was completed, the surface coating layer’s shape, the hardness according to the cross-section’s thickness, and the microstructure were analyzed.
Źródło:: Archives of Metallurgy and Materials; 2021, 66, 4; 1033-1036
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 96.

Tytuł:: An Analysis of the Microstructure, Macrostructure and Microhardness of Nicr-Ir Joints Produced by Laser Welding with and without Preheat
Autorzy:: Różowicz, S.
Tofil, S.
Zrak, A.
Powiązania:: https://bibliotekanauki.pl/articles/958213.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: microstructure
microhardness
microjoint
laser welding
refractory metals
Opis:: This paper discusses some of the basic problems involved in laser welding of dissimilar materials with significant differences in melting points. It focuses on the micro and macrostructure of laser welded NiCr-Ir microjoints used in central spark plug electrodes. The joints were produced by welding with and without preheat using an Nd,YAG laser. The structure and composition of the welded joints were analyzed by means of a light microscope (LM) and a scanning electron microscope (SEM) equipped with an energy dispersive X-ray (EDX) spectrometer. The microhardness of the weld area was also studied.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 2B; 1157-1162
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 97.

Tytuł:: Strukturen im Wörterbuch als Schlüsselwörter
Autorzy:: Konieczna-Serafin, Joanna
Powiązania:: https://bibliotekanauki.pl/articles/474026.pdf
Data publikacji:: 2018
Wydawca:: Uniwersytet Warszawski i Uniwersytet Rzeszowski
Tematy:: dictionary structure, macrostructure, microstructure, mediostructure, dictionary headwords
Opis:: The article constitutes an attempt to examine dictionary structures functioning as keywords. Here, the term keyword is understood as a key to the knowledge represented by lexicographic data. The study aims to investigate which of the following, namely, macro-, micro- or mediostructure, is used for conveying linguistic and encyclopedic informations in a dictionary. Within this framework, ways in which the said structures are correlated with one another and the access path of a dictionary are presented. The main objects of investigation are German-Polish and Polish-German dictionaries of specialist economic terms.
Źródło:: tekst i dyskurs - text und diskurs; 2018, 11; 449-461
1899-0983
Pojawia się w:: tekst i dyskurs - text und diskurs
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 98.

Tytuł:: Effects of the Coiling Temperature and Anisotropy on the Tensile Properties of High-Strength API X70 Linepipe Steel
Autorzy:: Oh, Dong-Kyu
Shin, Seung-Hyeok
Lee, Sang-Min
Hwang, Byoungchul
Powiązania:: https://bibliotekanauki.pl/articles/2174576.pdf
Data publikacji:: 2022
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: linepipe steels
anisotropy
tensile property
texture
microstructure
Opis:: In this study, the effect of the coiling temperature on the tensile properties of API X70 linepipe steel plates is investigated in terms of the microstructure and related anisotropy. Two coiling temperatures are selected to control the microstructure and tensile properties. The API X70 linepipe steels consist mostly of ferritic microstructures such as polygonal ferrite, acicular ferrite, granular bainite, and pearlite irrespective of the coiling temperature. In order to evaluate the anisotropy in the tensile properties, tensile tests in various directions, in this case 0° (rolling direction), 30°, 45° (diagonal direction), 60°, and 90° (transverse direction) are conducted. As the higher coiling temperature, the larger amount of pearlite is formed, resulting in higher strength and better deformability. The steel has higher ductility and lower strength in the rolling direction than in the transverse direction due to the development of γ-fiber, particularly the {111}<112> texture.
Źródło:: Archives of Metallurgy and Materials; 2022, 67, 4; 1487--1490
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 99.

Tytuł:: Microstructure and magnetic properties of amorphous Fe51Co12Si16B8Mo5P8 alloy
Autorzy:: Hasiak, M.
Miglierini, M.
Amini, N.
Bujdoš, M.
Powiązania:: https://bibliotekanauki.pl/articles/147218.pdf
Data publikacji:: 2017
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: microstructure
Mössbauer spectroscopy
magnetic properties
Curie point
Opis:: Microstructure and thermomagnetic characteristics of the amorphous Fe51Co12Si16B8Mo5P8 alloy in the as-quenched state and after 1 h of annealing at 573 K and 773 K are studied. The structural investigations performed by Mössbauer spectroscopy and X-ray diffractometry confirmed the amorphous structure of the analysed materials. An increase in the annealing temperature up to 773 K does not lead to crystallization of the amorphous alloy. Only structural rearrangement that causes changes in the topological short-range order and annealing out of free volume is observed. This behaviour was confi rmed by modifications of the shapes of hyperfi ne field distributions derived from the corresponding Mössbauer spectra of the investigated alloys. The Curie temperatures of the as-quenched and annealed Fe51Co12Si16B8Mo5P8 alloy at 573 and 773 K are 400, 405 and 421 K, respectively.
Źródło:: Nukleonika; 2017, 62, 2; 85-89
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 100.

Tytuł:: Modern micropattern gas detectors
Autorzy:: Bochenek, M.
Koperny, S.
Kowalski, T. Z.
Powiązania:: https://bibliotekanauki.pl/articles/148102.pdf
Data publikacji:: 2008
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: microstructure detector
microstrip
GEM
MICROMEGAS
capillary plate
Opis:: In all measurement systems of radiation, the detector is the most important part. We can say that it is the heart of these systems. Gas detectors are still the most popular type of detector. Modern technologies allow manufacturing gas detectors having a very good energy and position (2D) resolution, high efficiency, large effective area, small count rate effect, radiation hardness, good signal-to-noise ratio and not complicated structure. These detectors are very fast and can stably work for a long period of time. One advantage of gas detectors is the possibility to read not only charge, but also UV light generated in the detector. In this paper we want to make a review of construction, mechanical properties, performance and possible applications of the following so-called micropattern gas detectors (MPGD): microstrip gas chamber (MSGC), gas electron multiplier (GEM), MICRO-MEsh GAseous Structure (MICROMEGAS) and capillary plate detector (CP).
Źródło:: Nukleonika; 2008, 53, suppl. 2; 25-28
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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