Research on Microstructure and Mechanical Properties of CoCrxNi Medium-Entropy Alloy

Authors：Shu Xiaoyong^*; Qiu Panpan; Hu Linli; Ri, Liu; Feng, Guo; Yang Simeng; Feng, Yu; Zhong Rongfang

Source：RARE METAL MATERIALS AND ENGINEERING, 2023, 52(2): 551-558.

• medium-entropy alloy
• CoCrxNi
• microstructure
• mechanical properties

In this research, based on the CoCrNi medium-entropy alloy with equal atomic ratio, the CoCrxNi(x=1.0, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, at%) medium-entropy alloys were prepared by a vacuum arc melting furnace, and the effect of Cr element content on the alloy microstructure and mechanical properties was studied. The results show that CoCrxNi(x=1.0, 1.5, 1.6) medium-entropy alloys are a single face-centered cubic phase (fcc). With the increase of Cr content, Cr rich strip structure of body centered cubic phase precipitates in fcc phase matrix of CoCrxNi (x=1.7, 1.8, 1.9, 2.0) medium-entropy alloys. The strength and hardness of the alloy continue to increase with the increase of the Cr element content, but the plasticity deteriorates. Compared with the equal atomic ratio CoCrNi medium entropy alloy, the strength and hardness of CoCr1.7Ni medium-entropy alloy are significantly improved, and the high plasticity maintains.

• Institution
  南昌航空大学