Criteria for laves-phase formation in refractory high-entropy alloys. (3rd June 2022)

• Record Type: Journal Article
• Authors: Yao, Hongwei; Qiao, Dongxu; Miao, Junwei; Wang, Jun; Guo, Enyu; Lu, Yiping
• Is Part Of: Philosophical magazine letters. Volume 102:Number 5/6(2022)
• Page Start: 161
• Page End: 177
• Publication Date: 2022-06-03
• Subjects: Refractory high-entropy alloys -- phase formation -- solid solution -- Laves phase; Condensed matter -- Periodicals; Physics -- Periodicals; Solid state physics -- Periodicals; Physique -- Périodiques; 530.41
• DOI: 10.1080/09500839.2021.1998692
• Languages: English
• ISSNs: 0950-0839

Abstract

ABSTRACT: 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.