About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Advances in Multi-Principal Elements Alloys X: Structures and Modeling
|
Presentation Title |
Metastability and Phase Selection in High Entropy Alloys |
Author(s) |
Sebastian A. Kube, Sungwoo Sohn, Pamela Banner, David Uhl, Amit Datye, Suchismita Sarker, Apurva Mehta, Jan Schroers |
On-Site Speaker (Planned) |
Sebastian A. Kube |
Abstract Scope |
High Entropy Alloys (HEAs) span a vast composition space, across which single-phase solid solutions (SPSS) can form at varying degrees of metastability. We argue that metastable SPSS form through polymorphic solidification upon rapid cooling. To quantify a HEA’s metastability, we propose the critical cooling rate of SPSS formation R_C_SPSS, which is analogous to R_C_Glass for glass formation. On this unified basis, we compare multicomponent alloys by their metastability and tendency to form SPSS or glasses, which is determined by the underlying atomic dispersity. We explore this space experimentally using combinatorial co-sputtering coupled with high-throughput EDX and synchrotron XRD. Within our new data set, which comprises ~15,000 ternary and quinary compositions based on 20 different elements, we find simple, yet insightful quantitative models for solid solution and glass formation. |
Proceedings Inclusion? |
Planned: TMS Journal: Metallurgical and Materials Transactions |
Keywords |
Machine Learning, High-Entropy Alloys, |