| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Spatially Tailored Materials: Processing-Structure-Properties
|
| Presentation Title |
Oxygen-Induced Hierarchical Heterogeneities and Enhanced Hardness in RMPEAs |
| Author(s) |
David Beaudry, Michael Waters, Gianna Valentino, Daniel Foley, Elaf Anber, Nathan Smith, Jean-Philippe Couzinie, Loic Perriere, Keith Knipling, Patrick Callahan, Toshihiro Aoki, Benjamin Redemann, Tyrel McQueen, Christopher Wolverton, James Rondinelli, Mitra Taheri |
| On-Site Speaker (Planned) |
David Beaudry |
| Abstract Scope |
Refractory multiprincipal element alloys (RMPEAs) offer superiority to incumbent high-temperature structural alloys due to high melting points and retained strength at elevated temperatures. Of this class of alloys, those containing Group IV and V elements possess adequate ductility, low density, and the necessary formability. However, these elements have dramatically different interactions with oxygen which creates uncertainty in predicting oxide evolution and in alloy design for oxidation resistance. We used advanced characterization and Monte Carlo simulations to decipher the complex sub-surface phase evolution during high-temperature oxidation of Group IV-V RMPEAs. We uncovered the formation of a refined hierarchical microstructure of short-range ordered domains, spatially confined spinodal decomposition, and nanoscale suboxides. This leads to a gradient hardness increase up to 23 GPa while preserving the plasticity of the base metal. Criteria for expansion of this alloy design strategy to other composition spaces and interstitial elements will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, High-Temperature Materials, Surface Modification and Coatings |