Effect of annealing process on microstructure and mechanical properties of CoCr0.4NiSi0.5 medium entropy alloy

doi:10.13251/j.issn.0254-6051.2024.10.026

Abstract

Abstract: CoCr_0.4NiSi_0.5 medium entropy alloy was prepared by vacuum suspension melting, and the effect of annealing process (annealing temperature of 1000 ℃, 1200 ℃, and holding time of 1 h) on microstructure and properties of the alloy was investigated. The results show that the phase structure of the annealed alloy is still a face-centered cubic solid solution compared to the as-cast alloy, and the microstructure is still a typical dendrite structure, with lamellar eutectic structure distributed among the dendrites, and a small amount of Cr-rich particles are precipitated in the dendrites. The hardness of the annealed alloy decreases, and decreases obviously when the annealing temperature is high, which is caused by the increase of interdendrite eutectic structure, the growth of dendrite and the decrease of σ phase content. After annealing treatment, the compression properties of the alloy are obviously improved, the compression yield strength and compression rate are increased, but the compression strength is decreased.

Key words: CoCr_0.4NiSi_0.5 medium entropy alloy, annealing process, microstructure, hardness, compressive properties

CLC Number:

TG156.1

Zhang Hao, Zhang Weiqiang, Zhang Li, Zhang Liwen, Wei Tao. Effect of annealing process on microstructure and mechanical properties of CoCr_0.4NiSi_0.5 medium entropy alloy[J]. Heat Treatment of Metals, 2024, 49(10): 156-161.

References

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Effect of annealing process on microstructure and mechanical properties of CoCr_0.4NiSi_0.5 medium entropy alloy

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