The present work investigated microstructures and mechanical properties of an annealed dual-phase high-entropy alloy (HEA) ${\text{CrFeCoNiAl}}_{0.7}$ between 700 and 1100 °C. It revealed that with the increased annealing temperature, there were rod-like B2 phase precipitating from the FCC-solution matrix, and the orientation between the precipitated B2 phase and the FCC matrix obeyed Kurdjumov-Sachs (K–S) relationship ${\left\{111\right\}}_{FCC}//{\left\{011\right\}}_{B2}$ and ${⟨011⟩}_{FCC}//{⟨111⟩}_{B2}$. The higher annealing temperature resulted in a drastic drop in yield strength, but a significant increase in fracture strain and work-hardening capacity. The positive value of the strain rate sensitivity (SRS) decreased with strain and the SRS of the HEA sample annealed at a lower temperature decreased greatly. Due to the formation of co-clusters, the activation volume of the annealed HEA presented an abnormal trend, that was, it increased with strain.

本工作研究了退火双相高熵合金 (HEA) 的显微组织和机械性能${\text{铬铁钴镍}}_{0.7}$在 700 和 1100 °C 之间。结果表明，随着退火温度的升高，有棒状B2相从FCC溶液基体中析出，析出的B2相与FCC基体的取向服从Kurdjumov-Sachs（K-S）关系。${\left\{111\right\}}_{FCC}//{\left\{011\right\}}_{乙2}$和${⟨011⟩}_{FCC}//{⟨111⟩}_{乙2}$. 较高的退火温度导致屈服强度急剧下降，但断裂应变和加工硬化能力显着增加。应变率灵敏度(SRS)的正值随着应变的增加而降低，在较低温度下退火的HEA样品的SRS大大降低。由于共簇的形成，退火后的 HEA 的活化体积呈现异常趋势，即随应变增加。