Abstract Systematic investigation of microstructure characterization and mechanical property was performed on metastable Fe46Co30Cr10Mn5Si7V2 high-entropy alloy (HEA) with varying the grain size. The grain coarsening led to the decrease in stability of face-centered-cubic (FCC) phase, and consequently generated the formation of laminate-morphology hexagonal-close-packed (HCP) and butterfly-morphology body-centered-cubic (BCC) martensite. During the tensile test, a transformation-induced plasticity (TRIP) from the FCC to BCC via the intermediate HCP occurred, and the accelerated transformation rate of BCC increased the strain-hardening rate. Our results suggest that microstructural evolutions related to thermally-induced martensitic transformation and strain-hardening mechanisms can be well interpreted by understanding the FCC to HCP to BCC martensitic transformation.

中文翻译：

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晶粒尺寸对亚稳态Fe46Co30Cr10Mn5Si7V2高熵合金体心立方马氏体相变的影响

摘要 对不同晶粒尺寸的亚稳态Fe46Co30Cr10Mn5Si7V2高熵合金(HEA)进行了显微组织表征和力学性能的系统研究。晶粒粗化导致面心立方 (FCC) 相稳定性降低，从而形成层状形态六方密堆积 (HCP) 和蝴蝶形态体心立方 (BCC) 马氏体. 在拉伸试验期间，发生了从 FCC 到 BCC 经中间 HCP 的相变诱导塑性 (TRIP)，并且 BCC 的加速相变速率增加了应变硬化速率。