A NOVEL 3d TRANSITION-METAL ALCOCRCUTI HIGH-ENTROPY ALLOY

Jiaojiao Yi; Lin Yang; Lu Wang; Mingqin Xu

doi:10.17222/mit.2021.013

Jiaojiao Yi School of Mechanical Engineering, Jiangsu University of Technology, 1801 Zhongwu Road, Zhonglou District, Changzhou 213001, PR China
Lin Yang School of Materials Science and Engineering, Jiangsu University of Technology, 1801 Zhongwu Road, Zhonglou District, Changzhou 212013, PR China
Lu Wang School of Materials Science and Engineering, Jiangsu University of Technology, 1801 Zhongwu Road, Zhonglou District, Changzhou 212013, PR China
Mingqin Xu School of Mechanical Engineering, Jiangsu University of Technology, 1801 Zhongwu Road, Zhonglou District, Changzhou 213001, PR China

DOI: https://doi.org/10.17222/mit.2021.013

Keywords: High entropy alloys; Phase structure; Microstructure; Mechanical properties.

Abstract

The phase component, microstructure and compressive properties of a novel 3d transition metal high entropy alloy, AlCoCrCuTi, in as-cast and annealed conditions were investigated. The phases of the as-cast AlCoCrCuTi alloy are composed of primary phase AlCo₂Ti (L2₁), eutectic structure {AlCo₂Ti (L2₁)+ Al₃Cr₇ (BCC)} and interdendritic phase AlCu₂Ti (L2₁). Through annealing, a rosette feature of the as-cast AlCo₂Ti + Al₃Cr₇ eutectic structure is deteriorated due to the lath-like Al₃Cr₇changed to finely-divided one. In mechanics performance, the as-cast alloy exhibits a balanced synergy in hardness (593±37 HV) and ultimate strength (745 MPa), while the hardness of the annealed alloy slightly increases to 647±23 HV at the expense of the ultimate strength. Moreover, the alloy either in as-cast or annealed conditions unfortunately display a typically brittle character. The deficiency of elongation might stem from the diversified brittle and hard phases incorporated, such as AlCo₂Ti + Al₃Cr₇.

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