Article ID Journal Published Year Pages File Type
7974586 Materials Science and Engineering: A 2018 50 Pages PDF
Abstract
After semi-solid processing the thixo-cast microstructure consisted of a unique composition of globular grains with a B2-ordered body centered cubic structure (BCC) within coherent nano-cuboidal precipitations (average size of 60 nm). The grains contained near equiatomic concentrations of Al, Co, Cr and Ni. They were surrounded by a Cu-enriched homogeneously distributed solid solution with an L12-ordered structure and Co-Cr nano-precipitations. The complex microstructure was responsible for the high strength and moderate ductility at room temperature, which was confirmed by compression test results. The thixo-cast revealed a yield strength of 1580 MPa, while its compression strength at 6% of strain reached 2070 MPa at an average hardness of 581 HV. The obtained values of yield strength and hardness were about 20% higher than those of the ingot material after direct casting. The melting behavior, microstructure and mechanical properties obtained make the AlCoCrCuNi HEA a promising material for thixoforming.
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Physical Sciences and Engineering Materials Science Materials Science (General)
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