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The influence of milling and spark plasma sintering on the microstructure and properties of the Al7075 alloy
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SYSNO ASEP 0489525 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název The influence of milling and spark plasma sintering on the microstructure and properties of the Al7075 alloy Tvůrce(i) Molnárová, O. (CZ)
Málek, P. (CZ)
Veselý, J. (CZ)
Minárik, P. (CZ)
Lukáč, František (UFP-V) ORCID
Chráska, Tomáš (UFP-V) RID, ORCID
Novák, P. (CZ)
Průša, F. (CZ)Číslo článku 547 Zdroj.dok. Materials. - : MDPI
Roč. 11, č. 4 (2018)Poč.str. 18 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. CH - Švýcarsko Klíč. slova gas atomized Al7075 alloy ; mechanical milling ; spark plasma sintering ; microstructure ; microhardness Vědní obor RIV JG - Hutnictví, kovové materiály Obor OECD Materials engineering CEP GA15-15609S GA ČR - Grantová agentura ČR Institucionální podpora UFP-V - RVO:61389021 UT WOS 000434710200089 EID SCOPUS 85045027816 DOI 10.3390/ma11040547 Anotace The compact samples of an Al7075 alloy were prepared by a combination of gas atomization, high energy milling, and spark plasma sintering. The predominantly cellular morphology observed in gas atomized powder particles was completely changed by mechanical milling. The continuous-like intermetallic phases present along intercellular boundaries were destroyed, nevertheless, a small amount of Mg(Zn, Cu, Al)2 phase was observed also in the milled powder. Milling resulted in a severe plastic deformation of the material and led to a reduction of grain size from several μm into the nanocrystalline region. The combination of these microstructural characteristics resulted in abnormally high microhardness values exceeding 300 HV. Consolidation through spark plasma sintering (SPS) resulted in bulk samples with negligible porosity. The heat exposition during SPS led to precipitation of intermetallic phases from the non-equilibrium microstructure of both gas atomized and milled powders. SPS of the milled powder resulted in a recrystallization of the severely deformed structure. An ultra-fine grained structure (grain size close to 500 nm) with grains divided primarily by high-angle boundaries was formed. A simultaneous release of stored deformation energy and an increase in the grain size caused a drop of microhardness to values close to 150 HV. This value was retained even after annealing at 425 °C. Pracoviště Ústav fyziky plazmatu Kontakt Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Rok sběru 2019
Počet záznamů: 1