Effect of annealing temperature on mechanical properties of cold-rolled CoCrFeNi high entropy alloy

doi:10.13251/j.issn.0254-6051.2025.02.020

Abstract

Abstract: A CoCrFeNi high entropy alloy was prepared by vacuum induction melting casting method, and the effect of different annealing temperatures on the mechanical properties of the CoCrFeNi high entropy alloy in -196 ℃ cryogenic rolling and room temperature rolling states was systematically studied. The results indicate that there is only FCC phase in the CoCrFeNi high entropy alloy in all the cold rolled and annealed states, and the percentage total extension at fracture and uniform elongation increase with the increase of annealing temperature, while the tensile strength decreases. Among them, the alloy in both the cold-rolled states has a good strength plasticity matching when annealed at 700 ℃. At the same annealing temperature, the strength of cryogenic rolled alloy is higher than that of alloy rolled at room temperature. There are numerous dimples distributed on the fracture of the as-cast CoCrFeNi high entropy alloy. The dimples on the fracture of the CoCrFeNi high entropy alloy in the two rolling states are few and shallow, and no dimple appears in some locations. As the annealing temperature increases, the size of the dimples increases and the number of pores increases.

Key words: CoCrFeNi high entropy alloy, cold rolling, annealing, mechanical properties

CLC Number:

TG156.25

Jiang Mengyuan, Wu Zhennan, Wu Chengbo, Xu Wang, Li Ning, Dong Fuyuan. Effect of annealing temperature on mechanical properties of cold-rolled CoCrFeNi high entropy alloy[J]. Heat Treatment of Metals, 2025, 50(2): 128-132.

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