Preparation, Microstructure Evolution and Mechanical Properties of AlCoCrFeNi High-entropy Alloys with Harmonic Heterostructure
XIU Mingqing1,2, LI Tianxin1, ZHANG Guojia1, ZOU Longjiang3, LU Yiping1,2
1 School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China 2 High Entropy Alloys Materials Engineering Research Center (Liaoning Province), Dalian 116024, Liaoning, China 3 Material Test and Analysis Center, School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
Abstract: Akind of AlCoCrFeNi high-entropy alloy (HEA) with harmonic heterostructure composed of outer fine grains and inner coarse grains was prepared by mechanical ball milling and spark plasma sintering. The quasi-static compressive mechanical properties of the alloy were tes-ted, and the phase structure and microstructure of the alloy were characterized. The results show that the yield strength of sintered AlCoCrFeNi HEA after ball milling is 1 686 MPa and the compressive strain rate is 16.5%. The yield strength and the compressive strain rate of the sintered AlCoCrFeNi HEA without ball milling are only 1 371 MPa and 16.2%, respectively. The yield strength and the compressive strain rate of the as-cast AlCoCrFeNi HEA are 1 363 MPa and 18.7%, respectively. Compared with the other two methods, the AlCoCrFeNi HEA prepared by ball milling and sintering has the best comprehensive mechanical property. The phase composition of the AlCoCrFeNi HEA prepared by sintering is consistent with that of the original powder, both composed of BCC+B2+FCC phase. The outer grains of the AlCoCrFeNi HEA powder were refined by mechanical ball milling, and formed harmonic heterostructure with the inner large grains. This special structure plays a role of back stress strengthening, and significantly improves the yield strength of the AlCoCrFeNi HEA.
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