We realized a good combination of shape memory effect and mechanical properties in a hot-rolled Fe_47.7Mn_15.5Co_9.8Cr_10.8Ni_5.1Si_11.1 high entropy alloy (HEA) by Si alloying and proper heat treatment to guarantee a low density of annealing twin boundaries. Its maximal recovery strain of 5.7% reached the level that conventional FeMnSi-based and Co-based shape memory alloys (SMAs) showing the same FCC to HCP martensitic transformation can realize. It showed a better combination of ultimate tensile strength and fracture strain than the reported CoCrFeNiMn-based HEAs with FCC matrix did. This result showed that to marry the shape memory effect with the excellent mechanical properties will be a promising direction for developing novel HEAs.

我们在热轧的 Fe _47.7 Mn _15.5 Co _9.8 Cr _10.8 Ni _5.1 Si _{11.1中实现了形状记忆效应和机械性能的良好结合}高熵合金 (HEA) 通过 Si 合金化和适当的热处理来保证退火孪晶界的低密度。其 5.7% 的最大恢复应变达到了传统的 FeMnSi 基和 Co 基形状记忆合金 (SMA) 表现出相同的 FCC 到 HCP 马氏体转变可以实现的水平。与报道的具有 FCC 基体的 CoCrFeNiMn 基 HEA 相比，它显示出更好的极限抗拉强度和断裂应变组合。这一结果表明，将形状记忆效应与优异的机械性能相结合将是开发新型 HEA 的一个有希望的方向。