Metastability in high entropy alloys

SCRIPTA MATERIALIA

卷:186

Article

Kube, Sebastian A.¹  Schroers, Jan¹ 

[1] Yale Univ, Dept Mech Engn & Mat Sci, 15 Prospect St, New Haven, CT 06511 USA

关键词: High Entropy Alloys;    Metallic Glasses;    Metastability;    Critical Cooling Rate;    Time-Temperature-Transformation Diagrams;   

DOI  :  10.1016/j.scriptamat.2020.05.049

来源: Elsevier

【 摘 要 】

The high entropy effect is often insufficient to fully stabilize single-phase solid solutions (SPSS), yielding only few, mostly metastable SPSS. While the prospective space of favorable SPSS formation is smaller than commonly assumed, larger degrees of metastability can open up the vast High Entropy Alloy space. We argue that HEAs form metastable SPSS through polymorphic solidification upon rapid cooling. To quantify a HEA's metastability, we propose the critical cooling rate of SPSS formation R-C(SPSS) analogous to R-C(GLASS). Thereby, we can compare multicomponent alloys by their metastability and SPSS or glass forming ability, which is determined by their underlying atomic dispersity. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd.

【 授权许可】

Free