Abstract

Dynamic loading of the Fe₅₀Mn₃₀Co₁₀Cr₁₀ high-entropy alloy (HEA) was carried out using a split Hopkinson pressure bar at room temperature. The effects of microstructures and loading strain rates on the adiabatic shear susceptibility of an Fe₅₀Mn₃₀Co₁₀Cr₁₀ HEA were evaluated for the first time by comparing metallographic observation, the stress collapse time, the critical values of strain corresponding to the adiabatic shearing initiation, and the adiabatic shearing formation energy per unit volume. The results show that the adiabatic shear susceptibility increases with the increase of loading strain rate. The smaller the grain size and the more hexagonal close-packed (hcp) phase of the Fe₅₀Mn₃₀Co₁₀Cr₁₀ HEA, the greater the strain hardening effect and the stronger the localized deformation resistance under the same dynamic loading conditions, and the lower the adiabatic shear susceptibility.

中文翻译：

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Fe 50 Mn 30 Co 10 Cr 10高熵合金的绝热剪切敏感性

摘要

Fe ₅₀ Mn ₃₀ Co ₁₀ Cr ₁₀高熵合金（HEA）的动态加载是在室温下使用分开的Hopkinson压力棒进行的。Fe ₅₀ Mn ₃₀ Co ₁₀ Cr _10的组织和加载应变速率对绝热剪切敏感性的影响通过比较金相观察，应力塌陷时间，对应于绝热剪切起始的应变临界值和单位体积的绝热剪切形成能，首次评估了HEA。结果表明，绝热剪切敏感性随加载应变率的增加而增加。Fe ₅₀ Mn ₃₀ Co ₁₀ Cr ₁₀ HEA的晶粒尺寸越小，六方密堆积相（hcp）越多，在相同的动态载荷条件下，应变硬化效果越强，局部变形抗力越强，并且降低绝热剪切敏感性。