Effect of cold-rolling and annealing on microstructure and mechanical properties of CoCrNi medium-entropy alloy

doi:10.13251/j.issn.0254-6051.2023.04.014

Abstract

Abstract: Microstructure and mechanical properties of CoCrNi medium-entropy alloy were investigated after cold-rolling at cryogenic temperature (-196 ℃) and room temperature (25 ℃) and annealing at 700 ℃ and 800 ℃. The results show that the alloy has an excellent match of strength and toughness after cold-rolling at -196 ℃+annealing at 700 ℃, with tensile strength of 1023 MPa and total elongation of 34%. Compared with that after cold-rolling at 25 ℃ +annealing at 700 ℃, cold-rolling at 25 ℃ +annealing at 800 ℃, and cold-rolling at -196 ℃+annealing at 800 ℃, the tensile strength increases by 16%, 13% and 37%, respectively. This is mainly due to the annealing twins produced by recovery and recrystallization in the specimen, which refines the grain, reduces the dislocation density, hinders dislocation movement and improves the strength of the alloy.

Key words: CoCrNi medium-entropy alloy, cold-rolling, annealing, mechanical properties, microstructure

CLC Number:

TG156.25

Zhang Mingxu, Xu Wang, Li Yongquan, Dong Fuyuan. Effect of cold-rolling and annealing on microstructure and mechanical properties of CoCrNi medium-entropy alloy[J]. Heat Treatment of Metals, 2023, 48(4): 85-88.

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