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Spark Plasma Sintering of a Gas Atomized Al7075 Alloy: Microstructure and Properties
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SYSNO ASEP 0468777 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Spark Plasma Sintering of a Gas Atomized Al7075 Alloy: Microstructure and Properties Author(s) Molnárová, O. (CZ)
Málek, P. (CZ)
Lukáč, František (UFP-V) ORCID
Chráska, Tomáš (UFP-V) RID, ORCIDArticle number 1004 Source Title Materials. - : MDPI - ISSN 1996-1944
Roč. 9, č. 12 (2016)Number of pages 15 s. Publication form Online - E Language eng - English Country CH - Switzerland Keywords gas atomized Al7075 alloy ; spark plasma sintering ; microstructure ; microhardness ; high temperature stability Subject RIV JJ - Other Materials R&D Projects GA15-15609S GA ČR - Czech Science Foundation (CSF) Institutional support UFP-V - RVO:61389021 UT WOS 000390953400050 EID SCOPUS 85007410618 DOI https://doi.org/10.3390/ma9121004 Annotation The powder of an Al7075 alloy was prepared by gas atomization. A combination of cellular, columnar, and equiaxed dendritic-like morphology was observed in individual powder particles with continuous layers of intermetallic phases along boundaries. The cells are separated predominantly by high-angle boundaries, the areas with dendritic-like morphology usually have a similar crystallographic orientation. Spark plasma sintering resulted in a fully dense material with a microstructure similar to that of the powder material. The continuous layers of intermetallic phases are replaced by individual particles located along internal boundaries, coarse particles are formed at the surface of original powder particles. Microhardness measurements revealed both artificial and natural ageing behavior similar to that observed in ingot metallurgy material. The minimum microhardness of 81 HV, observed in the sample annealed at 300 °C, reflects the presence of coarse particles. The peak microhardness of 160 HV was observed in the sample annealed at 500 °C and then aged at room temperature. Compression tests confirmed high strength combined with sufficient plasticity. Annealing even at 500 °C does not significantly influence the distribution of grain sizes—about 45% of the area is occupied by grains with the size below 10 µm. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2017
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