Abstract A duplex microstructure consisting of body-centered-cubic (BCC/B2) and face-centered-cubic (FCC) phases was observed after homogenization and recrystallization treatments in Al0.45CoCrFeNi high-entropy alloys (HEAs). The precipitates of BCC phase effectively suppressed the grain growth during recrystallization and annealing, resulting in an ultrafine-grained microstructure. Analysis based on the modified Zener-Smith model and growth kinetics for grain size of the matrix indicate the phase boundaries act as strong obstacle for grain coarsening. This dual phase HEAs exhibit yield strength values varying widely from 300 MPa to 1200 MPa, depending on the heat treatment conditions and corresponding microstructures. An excellent combination of yield strength (~980 MPa), ultimate tensile strength (~1160 MPa), and tensile elongation (~15%) was achieved by optimizing and coupling both phase precipitation and recrystallization kinetics. The current work describes a strategy in developing high-performance ultrafine-grained HEAs for future industrial applications.

中文翻译：

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超细晶粒双相 Al0.45CoCrFeNi 高熵合金

摘要 在Al0.45CoCrFeNi 高熵合金(HEAs) 进行均质化和再结晶处理后，观察到由体心立方(BCC/B2) 和面心立方(FCC) 相组成的双相组织。BCC相的析出物有效地抑制了再结晶和退火过程中的晶粒长大，形成了超细晶粒组织。基于修正的 Zener-Smith 模型和基体晶粒尺寸生长动力学的分析表明，相界是晶粒粗化的强大障碍。这种双相 HEAs 的屈服强度值在 300 MPa 到 1200 MPa 之间变化很大，这取决于热处理条件和相应的微观结构。屈服强度 (~980 MPa)、极限拉伸强度 (~1160 MPa) 的完美结合，拉伸伸长率 (~15%) 是通过优化和耦合相沉淀和再结晶动力学实现的。目前的工作描述了为未来工业应用开发高性能超细粒度 HEA 的策略。