In this study, we propose an effective and feasible strategy to significantly improve the room-temperature yield strength of the CoCrFeMnNi HEA by 338%, from 281 MPa (as-recrystallized, before CR) to 1231 MPa (30% CR) through cryo-pre-strain-inducing defects such as dislocations, stacking-faults (SFs), nano-twins, Lomer-Cottrell (L-C) locks, and HCP martensite, while maintaining good ductility (16.4% elongation in 30% CR). Additionally, the contribution of these defects to the yield strength enhancement was quantified. This study offers a new perspective for the preparation of advanced FCC high-entropy alloys.

中文翻译：

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低温预应变有助于实现高熵合金的高屈服强度

在这项研究中，我们提出了一种有效且可行的策略，通过低温冷冻将 CoCrFeMnNi HEA 的室温屈服强度显着提高 338%，从 281 MPa（再结晶时，CR 之前）提高到 1231 MPa（30% CR）。预应变诱导缺陷，如位错、堆垛层错 (SF)、纳米孪晶、Lomer-Cottrell (LC) 锁和 HCP 马氏体，同时保持良好的延展性（30% CR 下的伸长率为 16.4%）。此外，还量化了这些缺陷对屈服强度增强的贡献。该研究为先进FCC高熵合金的制备提供了新的视角。