Criteria for laves-phase formation in refractory high-entropy alloys

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 effe...

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Bibliographic Details
Published inPhilosophical magazine letters Vol. 102; no. 5-6; pp. 161 - 177
Main Authors Yao, Hongwei, Qiao, Dongxu, Miao, Junwei, Wang, Jun, Guo, Enyu, Lu, Yiping
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis 03.06.2022
Taylor & Francis Ltd
Subjects
Criteria
Enthalpy
Entropy of formation
High entropy alloys
Laves phase
phase formation
Phase stability
Precipitates
Refractory alloys
Refractory high-entropy alloys
Solid phases
solid solution
Solid solutions
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Summary: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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ISSN:0950-0839
1362-3036
DOI:10.1080/09500839.2021.1998692