Effect of C and B on microstructure and properties of annealed AlFeMnCoCr high entropy alloy

doi:10.13251/j.issn.0254-6051.2025.04.001

Abstract

Abstract: Al₁Fe₄₉Mn₃₀Co₁₀Cr₁₀, Al₁Fe_48.5Mn₃₀Co₁₀Cr₁₀C_0.5 and Al₁Fe_48.475Mn₃₀Co₁₀Cr₁₀C_0.5B_0.025 high entropy alloys were prepared by vacuum arc melting method, and then hot rolling, homogenization, cold rolling and annealing at 700 ℃ for 30 min for the three alloys were carried out. The effects of C and B interstitial atoms on the microstructure and mechanical properties of the tested high entropy alloys were studied by using XRD, EBSD and universal testing machine. The results show that the addition of C and B interstitial atoms makes the grain size of the alloys smaller after hot rolling and homogenization, and the degree of recrystallization reduces after annealing at 700 ℃, the dislocation density and the content of small angle grain boundaries increase, which reduces the formation ability of annealing twins. The addition of B element strengthens the grain boundary, increases the cohesion of the grain boundary, reduces the probability of intergranular fracture during deformation, and improves the plasticity, so that the Al₁Fe_48.475Mn₃₀Co₁₀Cr₁₀C_0.5B_0.025 alloy exhibits excellent product of strength and elongation of 42.11 GPa·%.

Key words: high entropy alloy, interstitial strengthening, microstructure, mechanical properties

CLC Number:

TG139

Liu Zhaohui, Cao Weipeng, Li Jie, Feng Yunli. Effect of C and B on microstructure and properties of annealed AlFeMnCoCr high entropy alloy[J]. Heat Treatment of Metals, 2025, 50(4): 1-8.

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