About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Refractory Metals 2025
|
| Presentation Title |
Designing Refractory Alloy Bond Coats That Develop Thermally-Grown Complex Oxides: An Investigation of the Cr-Ta System |
| Author(s) |
Matthew Foong, Andrew Zang, Daniel R Mumm |
| On-Site Speaker (Planned) |
Matthew Foong |
| Abstract Scope |
Refractory alloys possess many attractive properties for use at elevated temperatures, particularly those beyond the capabilities of Ni-based superalloys. However, their actual temperature capabilities are often handicapped by poor oxidation resistance. Recent research into high-entropy alloys has suggested that the thermal growth of certain complex oxides, such as CrTaO4, may be solutions to this issue. As such, this work seeks to investigate the mechanisms of complex oxide formation at a fundamental level by studying the base binary alloys of these complex oxides. The CrTa system is chosen due to the promise exhibited by CrTaO4. This work explores the relationships between temperature, composition, and TGO evolution through controlled-environment oxidation experiments and high-resolution materials characterization. These observations and contextual thermodynamics and kinetics are discussed, as well as further efforts in alloy development aimed at producing a protective refractory alloy bond coat that will unlock the potential of emerging refractory high entropy alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Surface Modification and Coatings, High-Entropy Alloys |