Two different processing routes of mechanical alloying followed by the spark plasma sintering (powder metallurgy) and vacuum arc melting (casting route) were employed to understand the role of processing routes on the phase and microstructural evolution in an equiatomic CrMoNbTiW refractory high-entropy alloy. Besides a major BCC solid solution, a small fraction of carbide, σ phase, nitride, and oxide phases were observed in the alloys prepared by the powder metallurgy route in contrast to a single-phase BCC solid solution in the casting route. The milling atmosphere (dry milling in air and Ar) has significantly influenced the phase and microstructural evolution, illustrating the substantial role of contaminants. Good thermal stability of microstructure at high homologous temperatures was shown based on the long-term heat treatment at 1300 °C for 240 h. The phase evolution predictions via Calphad studies were found to be in reasonable agreement with the experimental observations, albeit with some limitations.

通过机械合金化的两种不同加工路径，然后进行火花等离子体烧结（粉末冶金）和真空电弧熔化（浇铸路径），以了解加工路径在等原子CrMoNbTiW难熔高熵合金中的相和微观组织演变的作用。除了主要的BCC固溶体之外，与铸造法中的单相BCC固溶体相比，在粉末冶金法制备的合金中还观察到少量的碳化物，σ相，氮化物和氧化物相。研磨气氛（在空气和Ar中进行干研磨）显着影响了相和微观结构的演变，说明了污染物的重要作用。基于在1300°C下进行240 h的长期热处理，显示出在高同源温度下微观结构的良好热稳定性。尽管有一定局限性，但通过Calphad研究进行的相演化预测与实验观察结果是合理吻合的。