铸态共晶高熵合金的研究进展

Research progress of as-cast eutectic high-entropy alloys

铸态共晶高熵合金在室温下的力学性能受到其化学成分、相组成和微观组织形貌的影响,是选用恰当的共晶高熵合金以适应于复杂服役环境的重要判据。文中通过调研近年来共晶高熵合金的相关文献,概述了共晶高熵合金的研究现状,按化学元素和共晶组织的相组成特点对共晶高熵合金进行了分类,即主要由FCC相+B2/BCC相组成的AlCoCrFeNi系、主要由FCC相+Laves相组成的CoCrFeNi-M系(M=Nb、Ta、Hf、Zr等)和其他相组成的共晶高熵合金。探讨了化学元素对微观组织的影响及其对力学性能的影响,并对共晶高熵合金的成分设计和组织性能优化进行了展望。

The mechanical properties of as-cast eutectic high-entropy alloys(EHEAs)at room temperature are affected by chemical compositions and microstructures,which are quite helpful to choose suitable EHEAs for the complicated service conditions.The research status of cocrystal high-entropy alloys was summarized through investigating the relevant literature of cocrystal high-entropy alloys in recent years.According to chemical compositions and phase constituents,the as-cast EHEAs were divided into three categories,namely AlCoCrFeNi system predominantly consisting of FCC and BCC phases,CoCrFeNi-M system(M=Nb,Ta,Hf and Zr)compromising FCC and Laves phases,and other alloy systems.The effect of those chemical compositions on microstructure evolution and,in turn,on mechanical properties was systematically discussed.Finally,the composition design and optimization of the tissue properties of cocrystal high entropy alloys were prospected.