采用真空电弧熔炼技术制备了AlFeCuCrNiCox(x=0,0.5,1.0)合金体系, 通过光学显微镜、扫描电镜、电子探针、X射线衍射仪以及透射电镜研究了在AlFeCuCrNi合金中加入钴元素后显微组织及结构的变化, 并对合金系的显微硬度、热稳定性及耐腐蚀性进行了研究。结果表明: AlFeCuCrNiCox(x=0,0.5,1.0)合金的显微组织均为树枝晶; 合金的物相组成均为简单的体心立方和面心立方的混合结构, 钴元素的加入会使合金中体心立方和面心立方的晶格常数均有所减小; 所有合金均存在成分偏析现象, 钴元素的加入加剧了合金中铜元素的偏析, 但促进了其他元素的均匀化; 钴元素的加入使合金显微硬度提高, 耐腐蚀性增加; 所有合金均具有较好的热稳定性。

AlFeCuCrNiCox(x=0, 0.5, 1.0) high entropy alloys were prepared by vacuum arc furnace. The microstructure and phase structure change of AlFeCuCrNi alloys after addition of element cobalt were investigated by OM, SEM, EMP, XRD and TEM. And hardness, thermal stability and corrosion resistance of these alloys were also studied. The results show the microstructure of AlFeCuCrNiCox alloys was typically dendritic structure, the phases of these alloys consisted of simple face-centered cubic (FCC) and body-centered cubic (BCC), and adding of element cobalt reduced the lattice constants both of FCC and BCC. Compositions segregation existed in all alloys, and addition of element cobalt promoted segregation of element copper and homogenization of all the other elements. The hardness and corrosion resistance of the alloys were increased after addition of element cobalt and all alloys possessed good thermal stability.