Skocz do pozycji: 1.

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

/5

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Skocz do pozycji: 2.

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

/5

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Skocz do pozycji: 3.

Tytuł:

Mikrostruktura i właściwości mechaniczne nadstopu INCONEL 625
Microstructure and mechanical properties Microstructure and mechanical properties Microstructure and mechanical properties of Inconel 625 superalloy

Autorzy:

Pakieła, Z.

Powiązania:

https://bibliotekanauki.pl/articles/211938.pdf

Data publikacji:

2010

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Obróbki Plastycznej

Tematy:

nadstop Inconel 625
mikrostruktura
właściwości mechaniczne
Inconel 625 superalloy
microstructure
mechanical properties

Opis:

W referacie przedstawiono wyniki badań mikrostruktury i właściwości blach z superstopu Inconel 625. Przeprowadzono ilościowe pomiary parametrów mikrostruktury i rozkładu wielkości ziarna za pomocą mikroskopii świetlnej i skaningowej mikroskopii elektronowej. Struktury dyslokacyjne badano za pomocą TEM. Badano blachy walcowane na zimno a następnie wyżarzane w różnych temperaturach, celem zbadania przebiegu rekrystalizacji statycznej. Przeprowadzono również próby rozciągania w temperaturze pokojowej i w temperaturach podwyższonych.
Mechanical properties and microstructure of Inconel 625 superalloy metal plates were tested. Light and electron scanning microscopy were used for quantitative description of microstructure and grain size distribution measurement. Dislocations structure was observed by TEM. Cold rolling followed by annealing at different temperatures was performed for static recrystallization investigation. Tensile tests at room and elevated temperatures were also performed.

Źródło:

Obróbka Plastyczna Metali; 2010, 21, 3; 143-154
0867-2628

Pojawia się w:

Obróbka Plastyczna Metali

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

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

/5

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Skocz do pozycji: 5.

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

/5

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Skocz do pozycji: 6.

Tytuł:

Microstructure Control of High-alloyed White Cast Iron

Autorzy:

Kawalec, M.

Powiązania:

https://bibliotekanauki.pl/articles/382878.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

white cast iron
microstructure
vanadium carbide
mechanical properties
microstructure modification
żeliwo białe
mikrostruktury
węglik wanadu
właściwości mechaniczne
modyfikacja mikrostruktury

Opis:

This paper presents the results of studies of high-alloyed white cast iron modified with lanthanum, titanium, and aluminium-strontium. The samples were taken from four melts of high-vanadium cast iron with constant carbon and vanadium content and near-eutectic microstructure into which the tested inoculants were introduced in an amount of 1 wt% respective of the charge weight. The study included a metallographic examinations, mechanical testing, as well as hardness and impact resistance measurements taken on the obtained alloys. Studies have shown that different additives affect both the microstructure and mechanical properties of high-vanadium cast iron.

Źródło:

Archives of Foundry Engineering; 2014, 14, 1; 49-54
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Microstructure of thermoplastic starch polymers

Autorzy:

Mitrus, M

Powiązania:

https://bibliotekanauki.pl/articles/25716.pdf

Data publikacji:

2006

Wydawca:

Polska Akademia Nauk. Instytut Agrofizyki PAN

Tematy:

microstructure
environment pollution
thermoplastic starch polymer
thermoplastic starch
packaging material

Źródło:

International Agrophysics; 2006, 20, 1
0236-8722

Pojawia się w:

International Agrophysics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Survey of Swahili Dictionaries: Elements of the Microstructure

Autorzy:

Wójtowicz, Beata

Powiązania:

https://bibliotekanauki.pl/articles/462524.pdf

Data publikacji:

2016-12-10

Wydawca:

Uniwersytet Warszawski. Wydział Orientalistyczny. Katedra Języków i Kultur Afryki

Tematy:

Swahili dictionaries
bilingual lexicography
microstructure
entry structure

Opis:

The present article investigates several elements of the microstructural level of Swahili bilingual dictionaries. The main emphasis is on the grammatical information, its content and presentation in the various dictionaries chosen for analy-sis. The other components of a dictionary entry analysed in-clude the headword, its citation form, and additionally the pronunciation, usage labels and etymological information not found in every dictionary. We investigate the many ways in which information can be presented to the user, influencing the user-friendliness of a given dictionary.

Źródło:

Studies in African Languages and Cultures; 2016, 50; 41-70
2545-2134
2657-4187

Pojawia się w:

Studies in African Languages and Cultures

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

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

/5

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Skocz do pozycji: 10.

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

/5

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Skocz do pozycji: 11.

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: 12.

Tytuł:

Changes in cotyledon cell microstructure during rapeseed processing before extraction

Autorzy:

Fornal, J.
Sadowska, J.
Winnicki, T.

Powiązania:

https://bibliotekanauki.pl/articles/1372598.pdf

Data publikacji:

1996

Wydawca:

Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie

Tematy:

oil seed
microstructure
extraction
cotyledon
flake
oil processing
mechanical treatment
light microscopy
mechanical property
scanning microscopy
cell microstructure
rapeseed

Opis:

The aim of the research was to evaluate the effect of seed conditioning and flakes steaming (hydrothermal processes) on destruction of cell structure being responsible for seed's mechanical resistance. Commercial rapeseeds were pretreated in different conditions. Seeds of the series A were conditioned at 40°C, flaked and then roasted for 35 min to 94°C. Seeds of the series В were heated up to 80°C, cooled to 49°C, flaked and roasted for 40 min to 97°C. The technological usability and mechanical resistance of control and conditioned seeds were good. The conditioning parameters affected slightly the structure of the series В seeds, only. Distinct changes in the microstructure and particle size of roasted flakes were observed, whereas the microstructure and size of press- -cake particles for both series of seeds were the same. Taking into consideration the requirements for pressing, pretreatment conditions of the series В resulted in more advantageous mechanical properties of flakes.
Poprawne sterowanie dwustopniowym procesem wydobycia oleju utrudnia duża zmienność właściwości mechanicznych nasion rzepaku. Szczególnie podczas ekstrakcji uciążliwa jest kruchość niektórych partii nasion. Różne warunki kondycjonowania nasion i prażenia płatków (procesów hydrotermicznych) mogą wpływać na stopień destrukcji struktury płatków (odpowiadającej za obniżenie odporności mechanicznej nasion) i w ten sposób oddziaływać na zachowanie się nasion rzepaku w procesach mechanicznych. Potraktowano zatem odmiennie dwie partie przemysłowych nasion rzepaku. W serii A nasiona kondycjonowano w temp. 40°C, płatkowano i prażono przez 35 min. W serii В nasiona podgrzewano do 80°C, ochładzano do 49°C i prażono około 40 min (temp. końcowa płatków 97°C). Analizowano przydatność technologiczną (test aglomeracji), odporność mechaniczną nasion (test punktu olejowego), rozkład wielkości cząstek w płatkach (surowych i prażonych) i wytłoku oraz zmiany mikrostruktury przy pomocy mikroskopii skaningowej i świetlnej (preparaty wybarwiane Nile Blue i Calcofluorem). Przydatność technologiczna i odporność mechaniczna nasion kontrolnych i po kondycjonowaniu była dobra (tabl. 1 i 2). Nasiona kontrolne i kondycjonowane serii A miały strukturę nienaruszoną (fot. 1-3). W serii В zaobserwowano niewielkie negatywne oddziaływanie obróbki hydrotermicznej na strukturę nasion (fot. 4). Prażone płatki z serii A mają naruszoną strukturę i dużą ilość otwartych komórek (fot. 5), a w płatkach serii В (oprócz silniej naruszonej struktury) widać większą fragmentację cząstek liścieni, zwiększony stopień otwarcia komórek i duże ilości tłuszczu pokrywającego prawie całą powierzchnię preparatu mikroskopowego (fot. 6 i 7). Mikroskopowy obraz wytłoku pozbawionego znacznej części tłuszczu był identyczny dla obu badanych wersji (fot. 8). Wyniki analizy stopnia rozdrobnienia płatków i wytłoku potwierdziły obserwacje mikroskopowe. Płatkowanie nasion kondycjonowanych A і В dało w obu przypadkach płatki o podobnej wielkości cząstek, natomiast rozkład wielkości cząstek w płatkach prażonych był odmienny. Rozkłady wielkości cząstek wytłoku był identyczne dla obu wersji (rys. 1). Mimo dużych różnic w warunkach obróbki wstępnej serii A i B, mikrostruktura i wielkość cząstek obu wytłoków były takie same, a charakterystyka badanych parametrów pozwoliła przewidywać dobry przebieg ekstrakcji. Stwierdzono natomiast, że warunki obróbki wstępnej serii В mają korzystniejszy wpływ na przygotowanie materiału do tłoczenia.

Źródło:

Polish Journal of Food and Nutrition Sciences; 1996, 05, 3; 25-36
1230-0322
2083-6007

Pojawia się w:

Polish Journal of Food and Nutrition Sciences

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:

Computer simulation of lamellar microstructure
Komputerowa symulacja struktury płytkowej

Autorzy:

Czarski, A.
Matusiewicz, P.

Powiązania:

https://bibliotekanauki.pl/articles/264051.pdf

Data publikacji:

2015

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

lamellar microstructure
pearlite
interlamellar spacing
struktura płytkowa
perlit

Opis:

Other than granular and dispersive microstructures, the lamellar microstructure is one of the most-frequently observed traits in the case of metal alloys. This work defines a geometrical model of a lamellar microstructure and presents its stereological relationships as well as our computer-simulation results for this model. The applied methodology creates – at least from a theoretical point of view – a series of interesting possibilities in the field of quantitative description of this type of microstructure and examinations of the properties of the parameter estimators that quantitatively characterize it.
Mikrostruktura płytkowa to – obok ziarnistej i dyspersyjnej – jedna z najczęściej spotykanych w przypadku stopów metali. W pracy zdefiniowano geometryczny model mikrostruktury płytkowej, przedstawiono dla tego modelu zależności stereologiczne oraz wyniki symulacji komputerowej. Wykorzystana metodologia stwarza – przynajmniej z teoretycznego punktu widzenia – szereg nowych interesujących możliwości w zakresie ilościowego opisu tego typu mikrostruktur i badania własności estymatorów parametrów, które ją ilościowo charakteryzują.

Źródło:

Metallurgy and Foundry Engineering; 2015, 41, 4; 161-169
1230-2325
2300-8377

Pojawia się w:

Metallurgy and Foundry Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 14.

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

/5

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Skocz do pozycji: 15.

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

/5

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Skocz do pozycji: 16.

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

/5

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Skocz do pozycji: 17.

Tytuł:

Simulation of dispersed microstructure
Symulacja mikrostruktury dyspersyjnej

Autorzy:

Czarski, A.

Powiązania:

https://bibliotekanauki.pl/articles/264025.pdf

Data publikacji:

2009

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

struktura dyspersyjna
symulacja
stereologia
generowanie liczb losowych
dispersed microstructure
simulation
stereology
random number generation

Opis:

Stereological description of dispersed microstructure is not an easy problem and is constantly a subject of research [1, 2]. From the practical point of view, the stereological description of this type of microstructures is essential in analyses of such processes as coarsening, spheroidization or in research of relationship between the microstructure and mechanical properties (e.g. bearing steel). The method of computer simulation is a very comfortable and effective way to test properties of stereological parameters of a microstructure. The computer model of a dispersed microstructure presented in the work is based on the following assumptions: (1) particles of dispersed phase are spheres randomly distributed in space; the input data are: number of spheres in unit volume Nv, volume fraction of spheres Vv and distribution of sphere diameters in space (through the probability density function f(D)), (2) the system of spheres is being cut by the cutting planes. As a result of the simulation we obtain the distributions of flat sections' diameters. The correctness of the model performance has been verified considering two cases relating to which we know analytical relations between distribution of spheres in space and distributions of flat sections' diameters: (1) the simulated structure consists of spheres of equal size, (2) spheres are subject to the Rayleigh distribution.
Stereologiczny opis mikrostruktury dyspersyjnej nie należy do zagadnień łatwych i wciąż jest przedmiotem wielu badań. W aspekcie praktycznym poprawny stereologiczny opis tego typu struktur jest niezbędny w analizie procesów koagulacji, sferoidyzacji, w badaniach związków pomiędzy strukturą a własnościami mechanicznymi (np. stale łożyskowe) itd. Bardzo wygodnym i efektywnym sposobem badania własności estymatorów stereologicznych parametrów mikrostruktury jest metoda symulacji komputerowej. Zaprezentowany w pracy komputerowy model struktury dyspersyjnej opiera się na następujących założeniach: (1) cząstki fazy dyspersyjnej są kulami rozmieszczonymi przypadkowo w przestrzeni; zadane są: liczność względna kul Nv, objętość względna kul Vv oraz rozkład średnic kul w przestrzeni (poprzez funkcję gęstości prawdopodobieństwa f(D)), (2) układ kul przecinany jest płaszczyzną tnącą. Jako wynik symulacji otrzymujemy rozkład średnic płaskich przekrojów. Poprawność funkcjonowania modelu zweryfikowano rozpatrując dwa przypadki, w odniesieniu do których znane są analityczne związki pomiędzy rozkładem kul w przestrzeni a rozkładami średnic płaskich przekrojów i długości cięciw: (1) symulowana struktura składa się z kul o jednakowej wielkości, (2) kule podlegają rozkładowi Rayleigha.

Źródło:

Metallurgy and Foundry Engineering; 2009, 35, 2; 129-136
1230-2325
2300-8377

Pojawia się w:

Metallurgy and Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

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

/5

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Skocz do pozycji: 19.

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

/5

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Skocz do pozycji: 20.

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

/5

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Skocz do pozycji: 21.

Tytuł:

Impact of microstructure in modelling physical properties of cereal extrudates

Autorzy:

Rzedzicki, Z.
Blaszczak, W.

Powiązania:

https://bibliotekanauki.pl/articles/26615.pdf

Data publikacji:

2005

Wydawca:

Polska Akademia Nauk. Instytut Agrofizyki PAN

Tematy:

microstructure
physical property
cereal extrudate
modelling
extrusion-cooking
extrudate
cereal

Źródło:

International Agrophysics; 2005, 19, 2
0236-8722

Pojawia się w:

International Agrophysics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

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

/5

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Skocz do pozycji: 23.

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

/5

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Skocz do pozycji: 24.

Tytuł:

Microstructure and Properties of Multifibre Composites

Autorzy:

Głuchowski, W.
Rdzawski, Z.
Domagała-Dubiel, J.
Sobota, J.

Powiązania:

https://bibliotekanauki.pl/articles/356505.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

fibrous composite
copper matrix
microstructure
mechanical properties
electrical properties

Opis:

In the study microstructure and properties of composite multifibre copper-base wires are presented. A decision was made to produce wires with “soft” fibres (Al) and “hard” fibres (Fe). In the study the phenomenon occurring on the border of Al-Cu was also analysed. The produced Cu-Al and Cu-Fe composites presented ordered microstructure with the fibres uniformly distributed in the copper matrix. The composites underwent plastic consolidation to the degree which provided satisfactory mechanical and electrical properties. During the drawing the fibres deformed proportionally with copper matrix therefore their content in the cross section remained unchanged.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 2B; 911-916
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Studies on the microstructure of lupine extrudate

Autorzy:

Rzedzicki, Z.
Fornal, J.

Powiązania:

https://bibliotekanauki.pl/articles/25519.pdf

Data publikacji:

1998

Wydawca:

Polska Akademia Nauk. Instytut Agrofizyki PAN

Tematy:

microstructure
yellow lupin
physical property
chemical property
raw material
hydrothermal process
lupin
extrusion

Źródło:

International Agrophysics; 1998, 12, 2
0236-8722

Pojawia się w:

International Agrophysics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

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

/5

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Skocz do pozycji: 27.

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

/5

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Skocz do pozycji: 28.

Tytuł:

Assessment of the microstructure and mechanical properties of porous gelatin scaffolds

Autorzy:

Morawska-Chochół, Anna

Powiązania:

https://bibliotekanauki.pl/articles/2058382.pdf

Data publikacji:

2021

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

scaffold
microstructure
tissue engineering
gelatin
freeze-drying
mikrostruktura
inżynieria tkankowa
żelatyna

Opis:

Gelatin scaffolds are in the interest of tissue engineering and drug release. The scaffold porosity and microarchitecture are of great importance in proper tissue regeneration. In this work, the freeze-drying method was used to produce the scaffolds. The effect of concentration of the initial gelatin solution and pre- -freezing temperature on the scaffold’s microstructure and microarchitecture (porosity, pores size, shape, and distribution) was evaluated. The mechanical tests of samples were performed. Moreover, the influence of the gentamicin sulphate addition on the gelatin scaffolds microstructure and mechanical properties was also studied. The linear relationship of porosity to the concentration of the initial solution was observed. Therefore, it is possible to obtain a scaffold with a planned porosity. Pores were interconnected with an aspect ratio between 1.5-1.8. For porosity 74 ± 9% the average pore size was 0.7 ± 0.6 mm, with most pores in the range 0.2-0.4 mm. For the samples with porosity 57 ± 14%, the average pore size was 0.2 ± 0.2 mm, with most pores in the range 0.05-0.2 mm. The process of pre-freezing the solution in liquid nitrogen caused the highest porosity of the sample, the smaller pores size and the lower pores size distribution in comparison to the sample pre-frozen in -20°C. The mechanical parameters for all the samples are sufficient for filling bone defects. The addition of a drug to gelatin caused only slight changes in the pore architecture. This material could be applied as a scaffold in the bone loss correlated to bacterial infection.

Źródło:

Engineering of Biomaterials; 2021, 4, 160; 22--27
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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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

/5

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Skocz do pozycji: 30.

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

/5

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Skocz do pozycji: 31.

Tytuł:

Influence of process parameters on the physical properties and microstructure of everlasting pea [Lathyrus sativus] extrudate

Autorzy:

Rzedzicki, Z.
Fornal, J.

Powiązania:

https://bibliotekanauki.pl/articles/24180.pdf

Data publikacji:

1999

Wydawca:

Polska Akademia Nauk. Instytut Agrofizyki PAN

Tematy:

Lathyrus sativus
everlasting pea
raw material
Polska
crude fibre
moisture content
pea
process parameter
extrudate microstructure
microstructure
temperature
physical property
extrusion method

Źródło:

International Agrophysics; 1999, 13, 1
0236-8722

Pojawia się w:

International Agrophysics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Study of Microstructure of Oriented Eutectic Fe-C Alloy

Autorzy:

Trepczyńska-Łent, M.

Powiązania:

https://bibliotekanauki.pl/articles/381607.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

directional solidification
eutectic alloy
microstructure
longitudinal section
transverse section
krzepnięcie
stop eutektyczny
mikrostruktura

Opis:

Fe - 4,25% C alloy was directionally solidified with a constant temperature gradient of G = 33,5 K/mm and growth rate of v = 83,3 μm/s (300 mm/h) using a vacuum Bridgman-type crystal growing facility with liquid metal cooling technique. To reveal more detailed microstructure, the deep etching was made. This was obtained in the process of electrolytic dissolution. The microstructure of the sample was examined on the longitudinal and transverse sections using an Optical Microscope and Scanning Electron Microscope. Using the Electron Backscattered Diffraction technique, phase map and analysis of phase were made. In this paper the analysis of Fe-C alloy eutectic microstructure is presented. Regular eutectic structure was obtained. The fracture surfaces show lamellar structure. Microscopic observation after electrolytic extraction indicates that the grains of longitudinal shape of eutectic cementite have been obtained. These grains are characterized by layered construction with many rounded discontinuities.

Źródło:

Archives of Foundry Engineering; 2018, 18, 1; 123-128
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

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

/5

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Skocz do pozycji: 34.

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

/5

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Skocz do pozycji: 35.

Tytuł:

Formation of microstructure and properties of Cu-3Ti alloy in thermal and thermomechanical processes

Autorzy:

Szkliniarz, A.

Powiązania:

https://bibliotekanauki.pl/articles/355778.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

copper-titanium alloy
microstructure
thermal and thermomechanical processes

Opis:

This paper presents the possibilities of forming the microstructure as well as mechanical properties and electrical conductivity of Cu-3Ti alloy (wt.%) in thermal and thermomechanical processes that are a combination of homogenising treatment, hot and cold working, solution treatment and ageing. Phase composition of the alloy following various stages of processing it into the specified semi-finished product was being determined too. It was demonstrated that the application of cold plastic deformation between solution treatment and ageing could significantly enhance the effect of hardening of the Cu-3Ti alloy without deteriorating its electrical conductivity. It was found that for the investigated alloy the selection of appropriate conditions for homogenising treatment, hot and cold deformation as well as solution treatment and ageing enables to obtain the properties comparable to those of beryllium bronzes.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 1; 223-230
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

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

/5

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Skocz do pozycji: 37.

Tytuł:

Connecting Hunter-Schreger Band microstructure to enamel microwear features: New insights from durophagous carnivores

Autorzy:

Tseng, Z.J.

Powiązania:

https://bibliotekanauki.pl/articles/20238.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Instytut Paleobiologii PAN

Tematy:

microstructure
enamel microwear feature
new insight
durophagous carnivore
Mammalia
Borophagine
Canidae
Hyaenidae
durophagy
bone
cracking
Miocene
Cenozoic
enamel microstructure
insight
paleontology
eating behaviour
animal behaviour
diet

Opis:

Several recent studies have clarified the link between microwear features and diet among living carnivorans, but it is still unclear whether previously interpreted evolutionary trends for dietary specialization, based on examination of enamel microstructure, are consistent with such insights from microwear analysis. This study examined the relationship between microwear and microstructure features using a sample of fossil hyaenids and canids. Hunter−Schreger Bands (HSB) and microwear features were examined at the same magnification level using optical stereomicroscopy. Multiple trials conducted on each specimen showed higher variance of smaller (<0.03 mm) microwear features compared to large (>0.03 mm) features. The number of pits was positively correlated with more derived HSB in both p4 and m1; fossil teeth with derived HSB possessed microwear features similar to patterns found in modern spotted hyenas. Microscopic scratches were not as closely associated with HSB patterns, but large scratches were more tightly linked to HSB than smaller ones on p4. An examination of evolutionary trends in HSB specialization in the two carnivoran lineages showed that derived HSB patterns evolved prior to the highly robust craniodental characteristics typical of later bone−cracking ecomorphologies. Therefore, the increase of hard food in the diet of less specialized hyaenids and canids was accompanied by a mosaic mode of evolution, with microstructural changes preceding key macrostructural morphological adaptations.

Źródło:

Acta Palaeontologica Polonica; 2012, 57, 3
0567-7920

Pojawia się w:

Acta Palaeontologica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Preservation of skeletal microstructure in fossil Scleractinia

Autorzy:

Morycowa, E.

Powiązania:

https://bibliotekanauki.pl/articles/23178.pdf

Data publikacji:

1980

Wydawca:

Polska Akademia Nauk. Instytut Paleobiologii PAN

Źródło:

Acta Palaeontologica Polonica; 1980, 25, 3-4
0567-7920

Pojawia się w:

Acta Palaeontologica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Prediction of Microstructure of Grey Cast Irons by Electrical Resistivity Measurements

Autorzy:

Petrič, M.
Mrvar, P.
Kastelic, S.

Powiązania:

https://bibliotekanauki.pl/articles/354044.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

solidification
grey cast iron
electrical resistivity
graphite shape
microstructure

Opis:

The paper describes the influence of graphite shape, size and amount to electrical properties of different cast irons. Experiments of electrical resistivity measurements were conducted during solidification of four different melts in different time intervals from melt treatment by inoculation and nodularization. Metallographic analyses were made in order to determine the shape, size, distribution and amount of graphite and correlate results with electrical resistivity measurements. It was found out that nodular graphite is giving the lowest electrical resistivity and is decreased during solidification. Electrical resistivity of lamellar cast iron is increased during solidification since lamellas interrupt metal matrix severely. There is no significant difference in resistivity of vermicular cast iron from nodular cast iron. Smaller size of graphite and lower amount of graphite and higher amount of metal matrix also decrease resistivity.

Źródło:

Archives of Metallurgy and Materials; 2019, 64, 1; 365-369
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

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

/5

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Skocz do pozycji: 41.

Tytuł:

Development of Structural Steel Containing 3÷5 wt% Al with Microlaminated Microstructure

Autorzy:

Garbarz, B.
Adamczyk, M.
Niżnik-Harańczyk, B.

Powiązania:

https://bibliotekanauki.pl/articles/351953.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

high strength steel
alloying with aluminium
microlaminated microstructure

Opis:

The aim of this work was to develop basic parameters of hot rolling and controlled cooling technology allowing to obtain the microlaminated (lamellar) microstructure in a lean-alloy structural steel containing 3÷5 wt % Al. Thermo-mechanical rolling tests of two experimental steels were carried out in a semi-industrial line comprising a one – stand reversing rolling mill. The final microstructure of the specimens subjected to rolling in the γ + α stability region characterised with the microlaminated morphology composed of lamellae of ferrite with thickness down to 1 μm or less and lamellae or grains of phases developed during transformation of the austenite. Determined parameters of the thermo-mechanical processing allowed to achieve very attractive mechanical properties of the experimental steels: tensile strength over 1.0 GPa and ductility level (total elongation) better than 15%.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 4; 2309-2315
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

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

/5

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Skocz do pozycji: 43.

Tytuł:

Phosphate replicated and replaced microstructure of molluscan shells from the earliest Cambrian of China

Autorzy:

Feng, W
Sun, W.

Powiązania:

https://bibliotekanauki.pl/articles/21263.pdf

Data publikacji:

2003

Wydawca:

Polska Akademia Nauk. Instytut Paleobiologii PAN

Tematy:

microstructure
fossil
shell
biomineralization
Mollusca
China
mollusc
Cambrian
paleontology

Opis:

The earliest Cambrian Meishucunian phosphoritic succession in eastern Yunnan,China,contains well−preserved molluscan shells that offer insights into the early evolution of skeletonization. Phosphate internal moulds,phosphate replaced originally carbonate shells,and phosphate coatings show lamello−fibrillar structure,prismatic structure,and regularly foliated structure. The lamello−fibrillar structure appears earlier in the fossil record than laminar structures such as nacreous or foliated structures. It has been identified in fossil mollusks,which occur in China as early as the lower phosphate layer of the Zhongyicun Member of the Meishucunian. Therefore,the lamello−fibrillar structure appears to be primitive in mollusks. The lamello−fibrillar and prismatic aragonite is the most common shell material of molluscan skeletons in the Early Cambrian Meishucunian and equivalents around the world. Although the early molluscan microstructure is not so diverse as that of extant mollusks,it may be of use in high rank taxonomic classification as shown by the early conchiferan mollusks discussed here. These mollusks are characterized by the horizontal fibrillae that are layered and parallel,and thereby differ from hyoliths,in which the horizontal fibrillae appear to be in the form of the bundles of fibres that can branch or anastomose.

Źródło:

Acta Palaeontologica Polonica; 2003, 48, 1
0567-7920

Pojawia się w:

Acta Palaeontologica Polonica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Effect of Sb-Modification on the Microstructure and Mechanical Properties of Secondary Alloy 319

Autorzy:

Medlen, D.
Bolibruchova, D.

Powiązania:

https://bibliotekanauki.pl/articles/357012.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

alloy 319
secondary alloy
microstructure
mechanical properties
modification
antimony

Opis:

319 alloy has been selected for the study in the present work due to its wide use in many applications. 319 alloy is used in automotive and aerospace industry for the complicated castings which must comply high strength requirements. In practice, the most common elements with the modifying effect are strontium, sodium and antimony. The addition of these elements leads to a change in the shape of eutectic silicon, resulting in an increase of the mechanical characteristics and the microstructure. An experimental program has been undertaken to explore the effect of antimony on chosen mechanical properties and the microstructure of investigated alloy. An analysis of the results of these experimental works is made in order to determine an optimum Sb (Al-10% Sb) addition to produce material exhibiting desirable properties. Experimental works have showed that the addition of the Al-10% Sb results in similar or even higher mechanical properties than the conventional 319 alloy. Based on the carried out experiments the best combination of mechanical properties has been achieved by the addition of 2 000 ppm Al-10% Sb.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 2A; 553-558
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Microstructure and Mechanical Properties of Joints of Titanium with Stainless Steel Performed using Nickel Filler

Autorzy:

Szwed, B.
Konieczny, M.

Powiązania:

https://bibliotekanauki.pl/articles/357024.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

diffusion brazing; titanium
stainless steel
microstructure
mechanical properties

Opis:

Diffusion brazing was performed between titanium (Grade 2) and stainless steel (X5CrNi18-10) using as a filler a nickel foil at the temperatures of 850, 900, 950 and 1000°C. The microstructure was investigated using light microscopy and scanning electron microscopy equipped with an energy dispersive X-ray system (EDS). The structure of the joints on the titanium side was composed of the eutectoid mixture αTi+Ti₂Ni and layers of intermetallic phases Ti₂Ni, TiNi and TiNi₃. The stainless steel-nickel interface is free from any reaction layer at 850°C, above this temperature thin layer of reaction appears. The microhardness measured across the joints reaches higher values than for titanium and stainless steel, and it achieves value from 260 to 446 HV. The highest shear strength (214 MPa) was achieved for joints brazed at 900°C.

Źródło:

Archives of Metallurgy and Materials; 2016, 61, 2B; 997-1001
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Durability of crystalline phase in concrete microstructure modified by the mineral powders: evaluation by nanoindentation tests

Autorzy:

Rajczakowska, M.
Łydżba, D.

Powiązania:

https://bibliotekanauki.pl/articles/178395.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

nanoindentation
concrete
Internal Crystallization Technology
microstructure
durability

Opis:

This paper presents the nanoindentation investigation of the evolution of concrete microstructure modified by the Internal Crystallization Technology mineral powders. The samples under study were retrieved from a fragment of a circular concrete lining of the vertical mine shaft at a depth of approximately 1,000 m. Due to the aggressive environment and exposure to contaminated water, the internal surface of the structure was deteriorated, decreasing its strength significantly. The mineral powders were applied directly on the surface lining. The specimens were investigated one month, three months and one year after the application of the aforementioned substance in order to verify the time dependence of the strengthening processes and durability of the crystalline phase. The microstructural changes of concrete were assessed with the use of nanoindentation technique. The testing procedure involved including the previously cut specimens in the epoxy resin and grinding and polishing in order to reduce the surface roughness. As a result of the nanoindentation tests the hardness as well as Young’s modulus of the material were evaluated. The results were then compared and statistically analyzed. As a consequence, the disintegration time of the crystalline network in the pores of concrete was identified.

Źródło:

Studia Geotechnica et Mechanica; 2016, 38, 1; 65-74
0137-6365
2083-831X

Pojawia się w:

Studia Geotechnica et Mechanica

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Damage resistance and microstructure of barley kernels

Autorzy:

Fornal, J.
Sadowska, J.
Ornowski, A.
Jelinski, T.
Velikanov, L.

Powiązania:

https://bibliotekanauki.pl/articles/24723.pdf

Data publikacji:

2000

Wydawca:

Polska Akademia Nauk. Instytut Agrofizyki PAN

Tematy:

microstructure
damage susceptibility
barley
Polish cultivar
endosperm
cell wall
mechanical property

Źródło:

International Agrophysics; 2000, 14, 2
0236-8722

Pojawia się w:

International Agrophysics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Microstructure evaluation of laser-welded 600 nickel alloy
Analiza mikrostruktury stopu niklu 600 spawanego wiązką lasera

Autorzy:

Tuz, L.

Powiązania:

https://bibliotekanauki.pl/articles/264259.pdf

Data publikacji:

2016

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

nickel alloys
laser welding
microstructure
stopy niklu
spawanie laserowe
mikrostruktura

Opis:

This paper presents the results of a microstructure analysis of a laser butt-welded 600 nickel alloy. A microstructure evaluation of the joint is carried out with the use of light microscopy and scanning electron microscopy. The results indicate a phase γ with some particles in the grain boundaries in the base metal. In the weld, a cellular-dendritic structure was observed.
W pracy przedstawiono wyniki oceny mikrostruktury złączy spawanych stopu niklu 600. Do oceny struktury wykorzystano mikroskopię świetlną i skaningową mikroskopię elektronową. Uzyskane wyniki wskazują na występowanie w materiale rodzimym struktury fazy γ wraz z niewielką ilością wydzieleń po granicach ziarn. Struktura spoiny ma budowę dendrytyczno-komórkową bez widocznych wydzieleń po granicach.

Źródło:

Metallurgy and Foundry Engineering; 2016, 42, 4; 233-238
1230-2325
2300-8377

Pojawia się w:

Metallurgy and Foundry Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 49.

Tytuł:

Microstructure Study of Diffusion Bonding of Centrifuged Structural Steel-Bronze

Autorzy:

Soflaei, H.
Vahdat, S. E.

Powiązania:

https://bibliotekanauki.pl/articles/382173.pdf

Data publikacji:

2016

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

centrifugal casting
bearings
microstructure
lubrication
diffusion bonding
line scan
odlewanie odśrodkowe
łożyska
mikrostruktura

Opis:

One of the methods to prevent unsuitable lubrication of moving components of devices and machinery is using bi-metal and three-metal bearings. Centrifugal casting process is one of the manufacturing methods that is used for such bearings. In this study, the purpose is microstructure evaluation of the bonding location and length determination of diffusion bond in structural steel-bronze. A mold made of structural steel with inner diameter of 240mm, length of 300mm and thickness of 10mm was coated by a 6mm film of bronze under centrifugal casting process. At first, a bronze ingot with dimension of 5mm×10mm×20mm is located inside of the hollow cylindrical mold and then the two ends of it will be sealed. During mold rotation with the rate of 800 rpm, two high power flames are used for heating the mold under Ar gas atmosphere to melt the bronze ingot at 1000˚C. After 15minutes, the system is cooled rapidly. Results showed that the diffusion bonding of bronze in structural steel to depth of 1.2μm from the bonding line was obtained. In this bonding, copper element was diffused to 50% of its initial concentration.

Źródło:

Archives of Foundry Engineering; 2016, 16, 2; 99-104
1897-3310
2299-2944

Pojawia się w:

Archives of Foundry Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 50.

Tytuł:

Microstructure and Mechanical Properties of Al-3 Vol% CNT Nanocomposites Processed by High-Pressure Torsion

Autorzy:

Asgharzadeh, H.
Kim, H. S.

Powiązania:

https://bibliotekanauki.pl/articles/354004.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

high-pressure torsion
aluminum
CNT
microstructure
mechanical properties

Opis:

Al-3 vol% CNT nanocomposites were processed by high-pressure torsion (HPT) at room temperature under the pressure in the range of 2.5-10 GPa for up to 10 turns. Optical microscopy, scanning electron microscopy, and transmission electron microscopy (TEM) were used to investigate the microstructural evolutions upon HPT. Mechanical properties of the HPT-processed disks were studied using tensile tests and microhardness measurements. The results show gradual evolutions in the density, microstructure, and hardness with increasing the number of turns and applied presure. Nanostructured and elongated Al grains with an average grain thickness of ~40 nm perpendicular to the compression axis of HPT and an aspect ratio of ~3 are formed after 10 turns under 6 GPa. Evaluating the mechanical properties of the 10-turn processed Al/CNT nanocomposites indicates a tensile strength of 321 MPa and a hardness of 122 Hv. The tensile fracture surface of the Al/CNT nanocomposite mostly demonstrates a smooth fracture manner with fine dimples resulting in a low tensile ductility of ~1.5%.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 2B; 1109-1112
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

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