CrFeCoNiCu多主元高熵合金的相分析

Phase Analysis of CrFeCoNiCu High Entropy Alloy

利用高分辨SEM与TEM观察显微组织,同时结合相图分析,提出了CrFeCoNiCu多主元高熵合金相的鉴定方法,结果表明:微观组织为枝晶和枝晶间组织,枝晶间存在大量纳米析出相。主要组成相包括枝晶内的Fe,Cr,Ni,Co的FCC固溶体相,枝晶间非晶相和Cu,Ni的FCC固溶体相。相图分析表明,合金材料在1400℃和1100℃左右发生的两次相变,形成了CrFeCoNiCu高熵合金的组织结构。

The identification of phase for CrFeCoNiCu high entropy alloy was performed by the analysis for phase diagram and observation for microstructure using high resolution SEM and TEM.The results show that the microstructure consists of simple dendrite and interdendritic structures containing nanoprecipitates.The constituent phases include the FCC solid solution phase of Fe,Cr,Ni,Co in the dendrites,the amorphous phase and FCC solid solution phase of Cu and Ni in the interdendrites.The phase diagram analysis shows that two phase transformations exist at the temperatures of 1400℃ and 1100℃,and microstructure of CrFeCoNiCu high-entropy alloy is formed.