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Wyświetlanie 1-15 z 119
Tytuł:
Microstructural and micromechanical tests of titanium biomaterials intended for prosthetic reconstructions
Autorzy:
Ryniewicz, A. M.
Bojko, Ł.
Ryniewicz, W. I.
Powiązania:
https://bibliotekanauki.pl/articles/307469.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
CAD/CAM
protetyka stomatologiczna
DMLS
mikrostruktura
mikrotwardość
tytan
stop tytanu
CAD/CAM system
dental prosthetics
direct metal laser sintering
microstructure
microhardness
titanium
titanium alloy
Opis:
Purpose: The aim of the present paper was a question of structural identification and evaluation of strength parameters of Titanium (Ticp – grade 2) and its alloy (Ti6Al4V) which are used to serve as a base for those permanent prosthetic supplements which are later manufactured employing CAD/CAM systems. Methods: Microstructural tests of Ticp and Ti6Al4V were conducted using an optical microscope as well as a scanning microscope. Hardness was measured with the Vickers method. Micromechanical properties of samples: microhardness and Young’s modulus value, were measured with the Oliver and Pharr method. Results: Based on studies using optical microscopy it was observed that the Ticp from the milling technology had a single phase, granular microstructure. The Ti64 alloy had a two-phase, fine-grained microstructure with an acicular-lamellar character. The results of scanning tests show that titanium Ticp had a single phase structure. On its grain there was visible acicular martensite. The structure of the two phase Ti64 alloy consists of a β matrix as well as released α phase deposits in the shape of extended needles. Micromechanical tests demonstrated that the alloy of Ti64 in both methods showed twice as high the microhardness as Ticp. In studies of Young’s modulus of Ti64 alloy DMLS technology have lower value than titanium milling technology. Conclusions: According to the results obtained, the following conclusion has been drawn: when strength aspect is discussed, the DMLS method is a preferred one in manufacturing load structures in dentistry and may be an alternate way for the CAD/CAM system used in decrement processing.
Źródło:
Acta of Bioengineering and Biomechanics; 2016, 18, 1; 121-127
1509-409X
2450-6303
Pojawia się w:
Acta of Bioengineering and Biomechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The character of the structure formation of model alloys of the Fe-Cr-(Zr, Zr-B) system synthesized by powder metallurgy
Autorzy:
Duriagina, Z. A.
Romanyshyn, M. R.
Kulyk, V. V.
Kovbasiuk, T. M.
Trostianchyn, A. M.
Lemishka, I. A.
Powiązania:
https://bibliotekanauki.pl/articles/366907.pdf
Data publikacji:
2020
Wydawca:
Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:
model alloys
phase diagram
microstructure
microhardness
XRD analysis
stop modelowy
diagram fazowy
mikrostruktura
mikrotwardość
analiza XRD
Opis:
Purpose: The purpose of the work is to synthesize and investigate the character of structure formation, phase composition and properties of model alloys Fe75Cr25, Fe70Cr25Zr5, and Fe69Cr25Zr5B1. Design/methodology/approach: Model alloys are created using traditional powder metallurgy approaches. The sintering process was carried out in an electric arc furnace with a tungsten cathode in a purified argon atmosphere under a pressure of 6·104 Pa on a water cooled copper anode. Annealing of sintered alloys was carried out at a temperature of 800°C for 3 h in an electrocorundum tube. The XRD analysis was performed on diffractometers DRON-3.0M and DRON-4.0M. Microstructure study and phase identification were performed on a REMMA-102-02 scanning electron microscope. The microhardness was measured on a PMT-3M microhardness meter. Findings: When alloying a model alloy of the Fe-Cr system with zirconium in an amount of up to 5%, it is possible to obtain a microstructure of a composite type consisting of a mechanical mixture of a basic Fe2(Cr) solid solution, solid solutions based on Laves phases and dispersive precipitates of these phases of Fe2Zr and FeCrZr compositions. In alloys of such systems or in coatings formed based on such systems, an increase in hardness and wear resistance and creep resistance at a temperature about 800°C will be reached. Research limitations/implications: The obtained results were verified during laser doping with powder mixtures of appropriate composition on stainless steels of ferrite and ferrite-martensitic classes. Practical implications: The character of the structure formation of model alloys and the determined phase transformations in the Fe-Cr, Fe-Cr-Zr, and Fe-Cr-B-Zr systems can be used to improve the chemical composition of alloying plasters during the formation of ferrite and ferrite-martensitic stainless steel coatings. Originality/value: The model alloys were synthesized and their phase composition and microstructure were studied; also, their microhardness was measured. The influence of the chemical composition of the studied materials on the character of structure formation and their properties was analysed.
Źródło:
Journal of Achievements in Materials and Manufacturing Engineering; 2020, 100, 2; 49-57
1734-8412
Pojawia się w:
Journal of Achievements in Materials and Manufacturing Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Morphology and Material Properties of Carbides in High (24%) Chromium Cast Iron
Autorzy:
Orłowicz, A. W.
Mróz, M.
Tupaj, M.
Trytek, A.
Jacek, M.
Radoń, M.
Powiązania:
https://bibliotekanauki.pl/articles/947498.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high chromium cast iron
microstructure
material properties
nanoindentation test
żeliwo wysokochromowe
mikrostruktura
właściwości materiału
próba nanoindentacji
Opis:
The present paper is a presentation of results of a study on morphology, chemical composition, material properties (HVIT, HIT, EIT), and nanoindentation elastic and plastic work for carbide precipitates in chromium cast iron containing 24% Cr. It has been found that the carbides differ in chemical composition, as well as in morphology and values characterizing their material properties. The carbides containing the most chromium which had the shape of thick and long needles were characterized with highest values of the analyzed material properties.
Źródło:
Archives of Foundry Engineering; 2018, 18, 1; 77-80
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research into morphology and properties of TiO2 – NiAl atmospheric plasma sprayed coating
Autorzy:
Maruszczyk, A.
Dudek, A.
Szala, M.
Powiązania:
https://bibliotekanauki.pl/articles/102426.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
microstructure
titania
TiO2–NiAl
atmospheric plasma spray
TiO2 coating
lamellae
microhardness
porosity
Opis:
Titania (TiO2) based coatings are ceramic products with unique properties that make them widely applicable (e.g. in automotive industry, optoelectronics, chemical processing or medicine). Atmospheric plasma spray process enables to deposit TiO2 with addition of NiAl feedstock material which has an influence on coating cohesion and adhesion to substrate. However, the literature and technical notes give little information about parameters of spraying of TiO2-10 wt.% NiAl feedstock powders enables producing coating without nonuniformities including cracks and delamination form substrate. The aim of the work was to verify the parameters of plasma spraying by evaluation of the morphology and properties of manufactured the TiO2-10 wt.% NiAl coatings. Titania based coatings were deposited by means of atmospheric plasma sprayed on steel substrate using TiO2-10 wt.% NiAl feedstock powders. Morphology and microstructure were examined using light optical microscope (LOM) and scanning electron microscope (SEM). Coating chemical composition were analysed by means of SEM-EDS method. Coating surface topography and Knoop microhardness were determined. Porosity and thickness were evaluated by using quantities image analysis programme. Plasma spraying parameters used in our research allow to obtain uniform coating without cracks and delamination at coating-substrate interface. It acknowledges that uniformity of coating technological properties as well manufactured coatings can be put to wear tests, such as high temperature oxidation, corrosion, erosion or cavitation erosion resistance evaluation.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 3; 204-210
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Different Torsion Pitch on Microstructural Evolution and Strengthening Mechanism of Al Wires
Autorzy:
Sedighi, M.
Vaezi, A.
Pourbashiri, M.
Powiązania:
https://bibliotekanauki.pl/articles/351811.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
torsion deformation
tensile test
micro hardness
microstructure
Al wire
Opis:
This paper focused on the effect of pure torsion deformation and various torsion pitches on the mechanical properties of the commercial pure Al wires which has not been examined so far. The initial wires with diameter of 4 mm have been torsion deformed to different pitch length (PL). In order to investigate the effect of gradient microstructure caused by torsion deformation, three different pitch length of 15 mm, 20 mm and 30 mm are considered. The results revealed that the level of grain refinement is correlated with the amount of induced plastic shear strain by torsion deformation. For the wire with pitch length of 15 mm, the grain sizes decreased to about 106 μm and 47 μm in the wire center and edge from the initial size of about 150 μm of the annealed wire. The micro-hardness measurement results show a gradient distribution of hardness from the wire center to the wire surface that confirmed the increasing trend of plastic shear strain obtained by FE simulations. The hardness of annealed sample (35 HV) is increased up to 73 HV at the wire surface for the smallest pitch length. The yield and ultimate tensile strength of the torsion deformed wires are also increased up to about 85 MPa and 152 MPa from the initial values of 38 MPa and 103 MPa of the annealed one respectively while the maximum elongation reduced significantly.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 2; 625-632
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation between shape factor and mechanical properties of graphitic cast irons
Autorzy:
Vasko, A.
Vasko, M.
Powiązania:
https://bibliotekanauki.pl/articles/973009.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Menedżerów Jakości i Produkcji
Tematy:
shape factor
cast iron
graphite
microstructure
mechanical properties
współczynnik kształtu
żeliwo
grafit
mikrostruktury materiałów
właściwości mechaniczne
Opis:
The evaluation of shape factor (circularity) is a subject of interest in many fields of applications such as medicine and industrial processes. The shape factor plays an important role in materials science as a way to understand the relationship between microstructure and mechanical properties of technical materials. The paper deals with measurement of shape factor of graphitic particles with the aim to understand the influence of microstructure (especially shape of graphite) on mechanical properties of graphitic cast irons.
Źródło:
Production Engineering Archives; 2016, 11, 2; 11-14
2353-5156
2353-7779
Pojawia się w:
Production Engineering Archives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Plastic Deformation on CCT-Diagram of Multi-Phase Forging Steel
Autorzy:
Wojtach, A.
Opiela, M.
Powiązania:
https://bibliotekanauki.pl/articles/2023786.pdf
Data publikacji:
2021
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
microstructure
multi-phase steels
CCT diagram
supercooled austenite
mikrostruktura
stale wielofazowe
diagram CCT
austenit przechłodzony
Opis:
The paper presents the results of research on the influence of plastic deformation and cooling conditions on microstructure, hardness and a shape of CCT-diagram (Continuous Cooling Transformations) of newly developed multi-phase steel assigned for die forgings, combining high strength, crack resistance and fatigue strength. The diagrams of undeformed and plastically deformed supercooled austenite transformations of steel, containing 0.175% C, 1.87% Mn, 1.0% Si, 0.22% Mo as well as Ti and V microadditions in concentration of 0.031% and 0.022%, respectively, were determined. Dilatometric tests were performed using a Bahr 805 A/D dilatometer. Specimens were austenitized at the temperature of 1000°C for 300 s and successively cooled to ambient temperature at a rate ranging from 60°C/s to 0.1°C/s. In order to determine the influence of plastic deformation on the shape of CCT-diagram, samples were deformed at the temperature of 1000°C, using a 50% degree of deformation, and then cooled in the same rate range as the samples which were not plastically deformed. The tests showed the following temperature results: Ac3 = 960°C, Ac1 = 832°C and a relatively low MS temperature equal 330°C. Plastic deformation of steel at the temperature of 1000°C, prior to the beginning of phase transformations, leads to significant increase in the ferritic transformation range, shifting the temperature of the beginning of this transformation to higher temperature in the entire range of cooling rates. It was also revealed that the specimens, plastically deformed at the austenitizing temperature, exhibit higher hardness compared to the specimens which were not plastically deformed, cooled with the same cooling rate. The elaborated CCT-diagrams of supercooled austenite transformations constitute the basis for correct development of the conditions of thermo-mechanical treatment of forgings from the tested steel.
Źródło:
Advances in Science and Technology. Research Journal; 2021, 15, 4; 72-80
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermomechanical properties of polyamide 6 with addition of fly ash from biomass
Autorzy:
Gnatowski, A.
Chyra, M.
Powiązania:
https://bibliotekanauki.pl/articles/105830.pdf
Data publikacji:
2017
Wydawca:
Centrum Badań i Innowacji Pro-Akademia
Tematy:
polyamide
composites
fly ash
thermomechanical properties
colour
microstructure
poliamid
kompozyty
popiół lotny
właściwości termomechaniczne
kolor
mikrostruktura
Opis:
Modification of polymer materials by various kinds of fillers is presently applied very often in massive production. This is due to the need for materials with better properties and lower prices for parts. One of the newest solutions is the filling of polymers with fly ash. This results in a change in products properties and reduction the amount of waste in the form of ashes. This article shows the results of investigations of thermomechanical properties of polyamide 6 modified by fly ash from the combustion of biomass. Comparative analysis of unfilled polyamide and polyamide composites with the addition of 5%, 10% and 15% of fly ash was performed. The specimens were obtained using injection moulding technology. The commercial name for the Polyamide 6 used in this study is TARNAMID T-27 and was manufactured by Zakłady Azotowe Tarnów. Fly ash manufactured by GDF Suez Energia Polska S.A. was applied as a filler. The investigations of mechanical properties were made using a harness by pressing ball method, impact strength by Charpy method and tensile strength. Differential scanning calorimetry (DSC), softening temperature by Vicat, and colour investigations were also performed. Pictures of microstructure were made.
Źródło:
Acta Innovations; 2017, 25; 38-46
2300-5599
Pojawia się w:
Acta Innovations
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Manufacturing with Application of Gpi Method and Selected Properties of Al Matrix Composites Reinforced Unidirectionally and Three-Directionally with Carbon Fibres
Wytwarzanie metodą infiltracji gazowej i wybrane własności kompozytów na osnowie aluminium, umocnionych jedno i trójkierunkowo włóknami węglowymi
Autorzy:
Wojtaszek, M.
Czulak, A.
Powiązania:
https://bibliotekanauki.pl/articles/356678.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminium matrix composites
carbon fibres
gas pressure infiltration
autoclave
microstructure
dilatometry
wear resistance
non-destructive testing
kompozyt z osnową aluminiową
włókna węglowe
infiltracja gazowa
mikrostruktura
dylatometria
odporność na zużycie
badania nieniszczące
Opis:
The discussion of the possibility of application of the GPI (gas pressure infiltration) process to the manufacturing of composites based on selected aluminium alloys reinforced with carbon fibres coated with nickel protective layer, as well as the determination of selected properties of materials obtained using this technique, is presented in the article. The composites reinforced unidirectionally (UD) were produced, the suitable volume fraction of fibres was determined and the proper forming parameters were established. Basing on the obtained results, with application of the same components, the composites reinforced three-directionally (3D) were subjected to infiltration. The preforms were designed and prepared using plaiting and joining methods. The GPI process parameters were verified for the assumed fibre arrangement. Thermal expansion of matrix alloys and composites obtained with application of most favourable parameters was determined and the influence of fibre arrangement and chemical composition of the matrix on the obtained results was analysed. The comparative abrasion tests with application of different velocities were performed for the selected alloy and the composite reinforced unidirectionally. In order to evaluate the changes taking place in the matrix during infiltration, the analysis of chemical composition of composites was performed for materials reinforced unidirectionally, as an example. The correctness of distribution of fibres in the composite matrix was also evaluated by means of microstructure observation as well as non-destructive testing with application of computed tomography technique. The results obtained during the investigations provide information concerning suitability and limitations of the GPI method to the manufacturing of light structural parts from the proposed components.
W pracy podjęto próbę oceny możliwości stosowania procesu infiltracji gazowej do wytwarzania kompozytów na osnowie wybranych stopów aluminium, umocnionych włóknami węglowymi pokrytymi warstwą ochronną niklu a także określenia wybranych właściwości otrzymanych w ten sposób materiałów. Wykonano kompozyty umocnione jednokierunkowo, określono odpowiedni dla nich udział objętościowy włókien i wyznaczono właściwe parametry ich formowania. W oparciu o otrzymane wyniki oraz stosując te same komponenty przeprowadzono proces infiltracji kompozytów umocnionych trójkierunkowo. Do tego celu zaprojektowano i przygotowano preformy z wykorzystaniem metod wyplatania oraz łączenia. Parametry procesu GPI zweryfikowano dla tak przyjętego układu włókien. Określono rozszerzalność termiczną stopów osnowy oraz kompozytów otrzymanych przy zastosowaniu najkorzystniejszych parametrów, ocenie poddano wpływ ułożenia włókien oraz składu chemicznego osnowy na otrzymane wyniki. Dla wybranego stopu i otrzymanego na jego osnowie kompozytu umocnionego jednokierunkowo wykonano porównawcze badania odporności na zużycie ścierne, które prowadzono przy różnej prędkości realizacji testów. W celu oszacowania zmian zachodzących w osnowie podczas infiltracji wykonano na przykładzie tworzyw umocnionych jednokierunkowo analizę składu chemicznego kompozytów. Ocenie poddano także poprawność rozlokowania włókien w osnowie kompozytów, prowadząc w tym celu obserwacje mikrostruktury oraz badania nieniszczące z wykorzystaniem metody tomografii komputerowej. Otrzymane podczas badań wyniki stanowią informację na temat przydatności i ograniczeń w stosowaniu metody GPI do wytwarzania z zaproponowanych komponentów elementów lekkich konstrukcji.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 4; 1539-1546
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effect of Long-Term Impact of Elevated Temperature on Changes in Microstructure and Mechanical Properties of HR3C Steel
Autorzy:
Zieliński, A.
Sroka, M.
Hernas, A.
Kremzer, M.
Powiązania:
https://bibliotekanauki.pl/articles/353972.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
HR3C steel
high temperature aging
microstructure
mechanical properties
Opis:
The HR3C is a new steel for pressure components used in the construction of boilers with supercritical working parameters. In the HR3C steel, due to adding Nb and N, the compounds such as MX, CrNbN and M23C6 precipitate during service at elevated temperature, resulting in changes in mechanical properties. This paper presents the results of microstructure investigations after ageing at 650, 700 and 750°C for 5,000 h. The microstructure investigations were carried out using scanning and transmission electron microscopy. The qualitative and quantitative identification of the existing precipitates was carried out using X-ray analysis of phase composition. The effect elevated temperature on microstructure and mechanical properties of the examined steel was described.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2A; 761-766
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Characterization of the reactivity of mineral additions by different microstructural and mechanical approaches
Autorzy:
Bouglada, M. S.
Naceri, A.
Baheddi, M.
Powiązania:
https://bibliotekanauki.pl/articles/89206.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
reactivity
pozzolanicity
mineral additions
physico-chemical properties
microstructure
Opis:
This paper presents an experimental study aimed at evaluating the reactivity of natural and industrial local mineral additions (pozzolan, slag and limestone) by different microstructural and mechanical approaches. Binary, ternary and quaternary cement compositions were prepared with partial replacement of the clinker by additions limited to 20%, according to CEM II / A cement specifications. The reactivity during the hydration process is characterized by the hydraulic power of the additions to react with the water and the hydrates of the cement and the pozzolanic capability of fixing the portlandite to form new mineral phases which contribute to the resistance as much as the hydrated products of cement. An experimental methodology was established for the reactivity illustration of the additions by a microstructural approach based on a study of the physicochemical and microstructural properties realized by X-ray diffraction (XRD), the scanning electron microscopy (SEM) on pastes. Further, thermogravimetric analysis (TGA), mercury microporosity (MIP) on mortars at 28 days of age was performed. A mechanical approach based on compressive strength at 2, 7 and 28 days to determine the activity index according to ASTM C 618 has been undertaken. The results obtained show a good correlation between the microporosity, X-ray diffraction and the resistance activity index, in particular for the slag, as for the thermogravimetric analysis that clearly confirms the pozzolanic activity of the pozzolan addition. As for mechanical performance, a binary mortar with 20% slag showed a better compressive strength at 28 days (49.40 MPa) with a reactivity index (87.90%) compared to the control mortar. Further, the slag developed better resistance (49.53 MPa) in combination with the other additions for quaternary mortars (pozzolan, limestone and slag) with an optimal rate of 5, 5 and 10%, respectively. Nevertheless, the pozzolan showed better compressive strength values compared to the slag for the binary mortars at young age 2 and 7 days of 25.67 and 32.07 MPa, respectively.
Źródło:
Mining Science; 2018, 25; 129-146
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
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 (Eg) 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
Artykuł
Tytuł:
Numerical and experimental analysis of isothermal forging process of ribbed plates made of 2099 aluminium alloy for aircraft structures
Analiza numeryczna i doświadczalna procesu kucia izotermicznego płyt żebrowanych ze stopu aluminium 2099 do konstrukcji lotniczych
Autorzy:
Baran-Sadleja, A.
Łukaszek-Sołek, A.
Motyka, M.
Powiązania:
https://bibliotekanauki.pl/articles/175707.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
FEM numerical simulation
isothermal forging
Al-Cu-Li-Zn-Mg alloys
microstructure
aircraft structures
symulacja numeryczna MES
kucie izotermiczne
stopy Al-Cu-Li-Zn-Mg
mikrostruktura
konstrukcje lotnicze
Opis:
The analysis of isothermal forging process of ribbed plates made of multicomponent (Al-Cu-Li-Zn-Mg system) third generation 2099 aluminium alloy is presented in the paper. Numerical simulation of forging was performed by finite elements method (FEM) using the QForm v.7 commercial software. Obtained results were the base for selection of conditions of isothermal forging for examined aluminium alloy. It was assumed in the work that ribbed plates could be produced by one-step forging. The isothermal forging at the temperature of 450ºC was conducted on designed test bed. Satisfactory shape accuracy and high quality surface of the forging were found. Evaluation of alloy’s microstructure before (T-83 condition) and after forging was performed by microscopic examination. It was found that obtained results of numerical simulation and experimental research can be a base for elaboration of industrial process of plastic forming of complex geometry flat structural parts made of 2099 aluminium alloy.
W pracy przedstawiono analizę wyników badań procesu kucia izotermicznego płyt żebrowanych z wieloskładnikowego (układ Al-Cu-Li-Zn-Mg) stopu aluminium trzeciej generacji 2099. Symulacje numeryczne kucia wykonano metodą elementów skończonych (MES) z zastosowaniem komercyjnego programu QForm v.7. Uzyskane wyniki były podstawą doboru warunków próby kucia izotermicznego badanego stopu aluminium. W badaniach przyjęto założenie, że jest możliwe kucie matrycowe płyt żebrowanych wykonanych w jednej operacji. Próbę kucia izotermicznego w temperaturze 450ºC prowadzono na zaprojektowanym stanowisku badawczym. Stwierdzono zadowalającą dokładność kształtu i wysoką jakość powierzchni wykonanej odkuwki. W badaniach mikroskopowych dokonano oceny mikrostruktury stopu przed (w stanie T-83) i po procesie kucia. Stwierdzono, że wyniki symulacji numerycznej i badań eksperymentalnych mogą stanowić podstawę opracowania warunków przemysłowego kształtowania plastycznego panelowych elementów konstrukcyjnych o złożonej geometrii ze stopu aluminium 2099.
Źródło:
Advances in Manufacturing Science and Technology; 2016, 40, 3; 61-72
0137-4478
Pojawia się w:
Advances in Manufacturing Science and Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 119

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