Effect of short-time annealing on microstructure and properties of (CrCoNi)96Cu4 medium entropy alloy

doi:10.13251/j.issn.0254-6051.2025.05.043

Abstract

Abstract: As-cast (CrCoNi)₉₆Cu₄ medium-entropy alloy was prepared by vacuum arc melting. Rolling deformation with a total deformation amount of 67% was carried out at room temperature. Subsequently, annealing treatments were performed at 700, 800 and 900 ℃ for 30 min, respectively. The results show that after short-term annealing, the phase composition of the alloy is a single-phase FCC, and no new phases are generated compared with the rolled state. The tensile strength of the rolled medium-entropy alloy is 1637 MPa, and the percentage total extension at fracture is less than 7%. After annealing, the plasticity of the alloy is significantly improved. This is because the microstructure undergoes recovery and recrystallization during annealing, and annealing twins and dispersed dislocations (arrays) are formed in the microstructure. When the annealing temperature is between 800 and 900 ℃, the tensile strength of the alloy ranges from 846 to 1032 MPa, and the percentage total extension at fracture is between 19% and 43%, achieving a good combination of strength and plasticity.

Key words: (CrCoNi)₉₆Cu₄ medium entropy alloy, room temperature rolling, short-time annealing, mechanical properties, microstructure

CLC Number:

TG156.2

Chen Jinliang, Jin Xueyuan, Zhang Limin. Effect of short-time annealing on microstructure and properties of (CrCoNi)₉₆Cu₄ medium entropy alloy[J]. Heat Treatment of Metals, 2025, 50(5): 274-278.

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Effect of short-time annealing on microstructure and properties of (CrCoNi)₉₆Cu₄ medium entropy alloy

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