| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Local Ordering in Materials and Its Impacts on Mechanical Behaviors, Radiation Damage, and Corrosion
|
| Presentation Title |
Oxidation Kinetics for Model Refractory Multiple Principal Element Alloy Nb-Ti-Zr |
| Author(s) |
Elizabeth J. Opila, Charlie Brandenburg, David Beaudry, Elaf Anber, Mitra Taheri |
| On-Site Speaker (Planned) |
Elizabeth J. Opila |
| Abstract Scope |
Oxidation kinetics of model refractory multiple principal element alloy Nb-Ti-Zr were studied by thermogravimetric analysis at temperatures between 900 and 1250C in 1% oxygen/argon for times between fifteen minutes and twenty hours. Cross-sectional scanning electron microscopy revealed a complex four-layered oxide with lamellae forming perpendicular to the specimen surface. Initial stages of Nb-Ti-Zr oxidation led to phase separation into oxygen rich Ti-Zr and Nb lamellae with a surface layer of primarily titanium oxide. This microstructure acted as a template as suboxides and higher oxides formed at longer exposure times. The oxide microstructure varied from submicron lamellae at 900C to much coarser microstructure as the exposure temperature increased. A minimum in oxidation rate was observed at about 1050C where the proportion of suboxides increased relative to total oxide thickness suggesting a correlation with a more protective surface oxide. Oxidation mechanisms and opportunities for improved oxidation resistance will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, High-Temperature Materials, Environmental Effects |