| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmental Degradation of Multiple Principal Component Materials
|
| Presentation Title |
Strategies for Improved Oxidation Resistance of Refractory Multiple Principal Element Alloys |
| Author(s) |
Elizabeth J. Opila, Charlie Brandenburg, Mitra Taheri |
| On-Site Speaker (Planned) |
Elizabeth J. Opila |
| Abstract Scope |
Refractory multiple principal element alloys are prone to poor oxidation resistance despite potential for improved strength at temperatures in excess of 1200C relative to nickel-base alloys. Typical strategies for improving alloy oxidation resistance are inclusion of sufficient amounts of Cr, Si, or Al to promote formation of continuous protective Cr2O3, SiO2, or Al2O3 scales. However, additions of these elements to group IV and V refractory alloys will result in intermetallic formation making them brittle. In this presentation, the beneficial effects of limited amounts of Al additions and/or increased substitution of Hf for Zr in TiZrHfNbTa-type alloys are described. Oxidation kinetics in 1% O2/balance Ar at temperatures between 900 and 1200C were acquired by thermogravimetric analysis. Subsequent phase and microstructural characterization via XRD, SEM, and EDS was obtained. Possible mechanisms for the improved oxidation resistance are discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, High-Temperature Materials, Environmental Effects |