| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Bcc-Superalloys
|
| Presentation Title |
Thermodynamics and Phase Transformation Pathways in BCC-B2 Refractory Superalloys |
| Author(s) |
Eric A. Lass |
| On-Site Speaker (Planned) |
Eric A. Lass |
| Abstract Scope |
Refractory-based superalloys (RSAs) containing a BCC+B2 two-phase microstructure offer great potential for future high-temperature applications, but several issues currently hinder their further development. Among them, the higher-order BCC-B2 phase transition leads to undesirable microstructures. The present work details the underlying thermodynamics governing the BCC-B2 phase transition and the multitude of pathways available for the BCC to BCC+B2 transformation in multicomponent alloys. Microstructural evolution in BCC-B2 RSAs parallels that in binary alloys such as Fe-Al, but the added compositional complexity opens new transformation pathways and may improve B2 phase stability. Previously reported RSAs are explained using a modeling framework constructed by combining modern computational thermodynamics with classic phase transformations theory, and new alloys are identified in previously uninvestigated systems. The ideas and discussion herein offer insight into the thermodynamics of microstructure development in RSAs and provide tools and guidance for future research in this promising class of materials. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, High-Temperature Materials, Phase Transformations |