About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmental Degradation of Multiple Principal Component Materials
|
| Presentation Title |
Tuning of Hierarchical Oxide Evolution in NbTiZr-based RMPEAs |
| Author(s) |
David Beaudry, Michael Waters, Charlotte Brandenburg, Daniel Foley, Elaf Anber, Jean-Philippe Couzinie, Loic Perriere, Keith Knipling, Benjamin Redemann, Tyrel M. McQueen, Elizabeth Opila, James Rondinelli, Mitra Taheri |
| On-Site Speaker (Planned) |
David Beaudry |
| Abstract Scope |
Refractory multi-principal element alloys (RMPEAs) have high specific strength at elevated temperatures, offering an alternative to Ni-based superalloys in high-temperature turbine applications. These alloys often exhibit detrimental oxidation behavior due to their constituent refractory elements. This issue has typically been addressed unsuccessfully by adding conventional passivating elements. Oxygen-induced miscibility gaps and resulting spinodal decomposition cause hierarchical layered transitions from the base metal to the surface oxide. These phase transformations offer an opportunity to tune the diffusion pathways between the surface oxide and base metal. Controlling these microstructures can reduce degradation of the surface oxide by limiting the oxygen that is diffused from the oxide into the bulk alloy. This novel approach to control oxidation resistance of RMPEAs was demonstrated in alloys based upon the NbTiZr system, and was verified through TEM, APT, and Monte Carlo simulations. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, High-Temperature Materials, Phase Transformations |