The ageing hardening mechanism of a newly designed Fe–Cr-based Fe₆₅Cr₁₃Cu₃(CoMnMoNiAlTi)₁₉ medium-entropy stainless alloy (ME-SA) with a simple bcc solid solution matrix was studied. This kind of ME-SA possessed a higher ageing hardness of approximately 584 HV and higher compressive stress and corrosion resistance than those of the conventional precipitation hardening stainless steel 17-4PH (Cr₁₇Ni₄Cu₄Nb), which has comparable compressive strain. The well-dispersed B2-ordered phase in the cast state transformed to a D0₃ crystal structure with a higher ordering degree and reduced the precipitate size after ageing at 500 °C, thus promoting a great ageing hardening effect.

研究了新设计的具有简单 bcc 固溶体基体的Fe-Cr 基 Fe ₆₅ Cr ₁₃ Cu ₃ (CoMnMoNiAlTi) ₁₉中熵不锈钢合金 (ME-SA)的时效硬化机制。这种 ME-SA 比传统的沉淀硬化不锈钢 17-4PH（Cr ₁₇ Ni ₄ Cu ₄ Nb）具有更高的时效硬度约 584 HV 以及更高的压缩应力和耐腐蚀性，后者具有可比的压缩应变。铸态中分散良好的 B2 有序相转变为 D0 ₃ 具有较高有序度的晶体结构，500℃时效后析出物尺寸减小，从而促进了较大的时效硬化效果。