Research progress of as-cast eutectic high-entropy alloys

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.