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Tytuł:
Challenges of Using Elemental Nickel and Titanium Powders for the Fabrication of Monolithic NiTi Parts
Autorzy:
Farvizi, M.
Powiązania:
https://bibliotekanauki.pl/articles/958198.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
hot isostatic pressing
NiTi
mechanical alloying
microstructure
mechanical properties
Opis:
Due to its interesting properties and wide applications in different industries, fabrication of monolithic NiTi with cost-effective methods is an important and attractive issue. One of the economic ways to fabricate NiTi is employing elemental nickel and titanium powders. In this study, effects of using elemental powders as a precursor on the microstructure and mechanical properties of HIP-consolidated NiTi samples will be explored. The result of XRD analysis showed that after HIP process an interwoven structure which consists of NiTi2, Ni3Ti and B2-B19′ NiTi evolves. The formation of NiTi2/Ni3Ti intermetallics is thermodynamically favored which affects different aspects of this alloy: (i) it alters martensitic transformation temperatures; (ii) restricts essential properties of this alloy such as PE and SME, (iii) increases hardness, and (iv) yields to premature fracture at small strains during tensile tests.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1075-1079
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
Tytuł:
Preparation and Evaluation of Properties of Cast Metallic Foams with Regular Inner Structure
Autorzy:
Lichý, P.
Elbel, T.
Kroupová, I.
Radkovský, F.
Powiązania:
https://bibliotekanauki.pl/articles/353931.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
metallic foams
casting
microstructure
mechanical properties
Opis:
Lately we encounter still more new applications of metallic foams, as well as possible methods of their manufacture. These metallic materials have specific properties, such as large rigidity at low density, in some cases high thermal conductivity, capability to absorb energy, etc. The work is focused on the preparation of these materials using conventional casting technology, which ensures rapid and economically feasible method for production of shaped components. In the experimental part we studied conditions of casting of metallic foams with a regular structure made of ferrous and non-ferrous alloys. For thus obtained castings we evaluated the achieved microstructure and mechanical properties, which determine the possible use of these materials. The samples were subjected to compression tests, by which we investigated deformation behaviour of selected materials and determined the value of energy absorption.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 3; 1643-1646
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Optimization of T-6 cycle and Characterization of Si3N4 Reinforced High Strength Aluminum Metal Matrix Composites
Autorzy:
Kumar, Ashish
Rana, Ravindra Singh
Purohit, Rajesh
Namdev, Anurag
Powiązania:
https://bibliotekanauki.pl/articles/28099516.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
stir casting
microstructure
mechanical properties
optimization
fractography
Opis:
In this research, AA7068/Si3N4 composites were fabricated through stir casting with the attachment of ultrasonic treatment. The quenching medium and aging duration significantly influenced the hardness of Al alloy samples. Peak hardness was achieved after 12 h of artificial aging at the temperature of 140°C. The addition of nano Si3N4 significantly refined the microstructure of unreinforced AA7068. The dispersion of intermetallic compounds (MgZn2) and grain boundary discontinuation were noticed after the T-6 heat treatment. Ultimate tensile strength, yield strength, and hardness were improved by 70.95%, 76.19%, and 44.33%, respectively, with the addition of 1.5 weight % Si3N4 compared to as-cast alloy due to the combined effect of heat treatment, hall-Petch, Orowan, thermal miss match, load-bearing strengthening mechanisms and uniform dispersion of reinforcement. A reduction in percentage elongation was noticed due to composites’ brittle nature by the effect of ceramic Si3N4 particles’ inclusion. The fracture surfaces reveal ductile failure for alloy and mixed-mode failure in the case of composites.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 2; 775--783
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Thermomechanical Controlled Processing and Quenching & Tempering on the Structure and Properties of Bainite-Martensite Steels
Autorzy:
Mandal, G.
Ghosh, S. K.
Chatterjee, S.
Powiązania:
https://bibliotekanauki.pl/articles/353508.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
steels
TMCP
heat treatment
microstructure
mechanical properties
Opis:
In the present time, advanced high strength steel (AHSS) has secured a dominant place in the automobile sector due to its high strength and good toughness along with the reduced weight of car body which results in increased fuel efficiency, controlled emission of greenhouse gases and increased passengers’ safety. In the present study, four new advanced high strength steels (AHSS) have been developed using three different processing routes, i.e., thermomechanical controlled processing (TMCP), quenching treatment (QT ), and quenching & tempering (Q&T) processes, respectively. The current steels have achieved a better combination of the high level of strength with reasonable ductility in case of TMCP as compared to the other processing conditions. The achievable ultrahigh strength is primarily attributed to mixed microstructure comprising lower bainite and lath martensite as well as grain refinement and precipitation hardening.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 2; 861-868
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Effect of synergic controlled pulsed and manual gas metal ARC welding processes on mechanical and metallurgical properties of AISI 430 ferritic stainless steel
Wpływ automatycznego i ręcznego spawania elektrodą topliwą na właściwości mechaniczne i metalurgiczne ferrytycznej stali nierdzewnej AISI 430
Autorzy:
Teker, T
Powiązania:
https://bibliotekanauki.pl/articles/351007.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
welding
mechanical
microstructure
spawanie
własności mechaniczne
mikrostruktura
Opis:
The gas metal arc is widely used in manufacturing industries because of the high metal deposition rate and ease of automation with better weld quality at permissible cost than other welding processes in joining similar and dissimilar metals. AISI 430 steel is normally difficult to weld by melting methods, due to the associated problems such as grain growth. For this purpose, AISI 430 ferritic stainless steel couples of 10 mm thick were welded by the synergic controlled pulsed (GMAW-P) and manual gas metal arc (GMAW) welding techniques. The interface appearances of the welded specimens were examined by scanning electron microscopy (SEM). Structural changes in the weld zone were analysed by energy dispersive spectrometry (EDS) and X-ray diffraction (X-RD). Microhardness, notch charpy and tensile tests were conducted to determine the mechanical properties of specimens. Accordingly, the best result was obtained from the GMAW-P technique.
Spawanie elektrodą topliwą w osłonie gazów aktywnych jest szeroko stosowane w przemyśle wytwórczym, ze względu na wysokie tempo osadzania metalu i łatwość automatyzacji oraz lepszą jakości spoiny przy dopuszczalnych kosztach niż w wypadku innych procesów spawania podobnych i różnych metali. Stal AISI 430 jest trudna do spawania metodami nadtapiania (z elektrodą nietopliwą), ze względu na związane z nimi problemy takie jak wzrost ziarna. Elementy ze stali ferrytycznej AISI 430 o grubości 10 mm zostały zespawane techniką GMAW-P i GMAW. Do badania morfologii spawanych próbek wykorzystano metodę skaningowej mikroskopii elektronowej (SEM). Zmiany strukturalne w strefie spoiny analizowano metodą spektrometrii z dyspersją energii (EDS) i dyfrakcji rentgenowskiej (X-RD). Pomiary mikrotwardości, udamości i próby rozciągania przeprowadzono w celu określenia właściwości mechanicznych próbek. Stwierdzono, że najlepszy wynik uzyskano dla spoin wytworzonych techniką GMAW-P.
Źródło:
Archives of Metallurgy and Materials; 2013, 58, 4; 1029-1035
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion Behavior of FeAl and Fe3Al Based Fe-Al-C Alloys in Sulfuric Acid
Autorzy:
Silva, A. P.
Brito, P. P.
Martins, N.
Powiązania:
https://bibliotekanauki.pl/articles/2134209.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
iron aluminides
microstructure
mechanical properties
corrosion resistance
Opis:
Iron aluminides are iron-aluminum alloys that have excellent resistance to oxidation at high temperatures with low density, high resistance/weight ratio and a low manufacturing cost. Due to its characteristics, these alloys are presented as an option to replace stainless steels in certain applications. This works intends report the casting process and subsequent analyses involving microstructure, mechanical properties, and corrosion resistance of two Fe-Al-C alloys (Fe-11wt%Al and Fe-25wt%Al, containing 0.31-0.37%C), which were prepared in an induction furnace and poured in a permanent mold. Samples of these alloys were characterized and presented elevated hardness values of 37 HRC (alloy Fe-11wt%Al) and 49.6HRC (alloy Fe-25wt%Al) and microstructure with aluminides type Fe3Al and FeAl and also carbides type K. The Fe-11wt%Al alloy exhibited superior resistance to uniform corrosion, although both Fe-Al-C alloys exhibited significantly higher corrosion rates compared to a binary iron aluminide in 0.5M H2SO4 containing naturally dissolved oxygen.
Źródło:
Archives of Foundry Engineering; 2022, 22, 2; 77--82
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Fabrication and Different Characterization of Graphene Nano Platelets Reinforced Epoxy Nano Composites
Autorzy:
Namdev, Anurag
Purohit, R.
Telang, A.
Kumar, A.
Powiązania:
https://bibliotekanauki.pl/articles/28099532.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
nano polymer composite
microstructure
GNP
epoxy
mechanical properties
Opis:
In this research, Graphene nanoplatelets (GNP) reinforced epoxy nano composites were fabricated via magnetic stirrer and ultra sonification assisted hand layup method. The impact of different weight percentage of GNP (0, 0.25, 0.50, and 1.0%) on different characteristics of nano composites was evaluated. The microstructure analysis of developed nano composite was determined by Field emission scanning electron microscopy. It was examined that epoxy nano composites containing 0.5 wt.% GNP have the highest tensile, flexural, and impact strength compared to neat epoxy. The reduction in tensile and flexural strength is achieved at 1% of GNP. Adding more nanofiller to a certain limit causes non-uniform dispersion and agglomeration of nanoparticles, which results in a reduction in properties. The 1% GNP reinforced nano composite has the highest value of shore hardness.
Źródło:
Archives of Metallurgy and Materials; 2023, 68, 2; 823--832
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Microstructure and Mechanical Properties of as Cast Al-6.5Mg-1.5Zn-0.5Fe Alloy Followed by Cold Rolling and Subsequent Annealing
Autorzy:
Lee, Seong-Hee
Powiązania:
https://bibliotekanauki.pl/articles/356133.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
aluminum alloy
cold rolling
annealing
microstructure
mechanical properties
Opis:
Microstructures and mechanical properties of as-cast Al-6.5Mg-1.5Zn-0.5Fe alloys newly alloy-designed for the parts of automobile were investigated in detail. The aluminum (Al) sheets of 4 mm thickness, 30 mm width and 100 mm length were reduced to a thickness of 1 mm by multi-pass rolling at ambient temperature and subsequently annealed for 1h at 200~500°C. The as-cast Al sheet was deformed without a formation of so large cracks even at huge rolling reduction of 75%. The recrystallization begun to occur at 250°C, it finished at 350°C. The as-rolled material showed tensile strength of 430 MPa and tensile elongation of 4.7%, however the specimen after annealing at 500°C showed the strength of 305 MPa and the elongation of 32%. The fraction of high angle grain boundaries above 15 degree increased greatly after annealing at high temperatures. These characteristics of the specimens after annealing were discussed in detail.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 3; 875-878
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 178

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