Laves相
高熵合金
耐火材料(行星科学)
材料科学
热力学
冶金
作者
Hongwei Yao,Dongxu Qiao,Junwei Miao,Jun Wang,Enyu Guo,Yiping Lu
标识
DOI:10.1080/09500839.2021.1998692
摘要
The refractory high-entropy alloys (RHEAs) have been the subject of considerable research in recent years. Since the Laves phase usually leads to a dramatic decrease in the malleability of RHEAs at ambient temperatures, it is critical to identifying the Laves-phase formation. Here, a facile and effective criterion is proposed to predict the phase stability based on the empirical parameters of reported RHEAs. The results indicate that the small atomic size difference is a sufficient condition for determining the stability of solid solution but not a necessary one. In general, the Laves-phase precipitates can be inhibited by decreasing the atomic-size difference, the enthalpy of mixing, and the valence electron concentration. These criteria can be easily adapted to design new RHEAs with the desired phase structure.
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