| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmental Degradation of Multiple Principal Component Materials
|
| Presentation Title |
Alumina-Forming Nb-Mo-Ti-Al Bond Coat Alloys |
| Author(s) |
Melina A. Endsley, Collin S. Holgate, Chiyo McMullin, Michael Worku, Carlos G. Levi, Tresa M. Pollock |
| On-Site Speaker (Planned) |
Melina A. Endsley |
| Abstract Scope |
Refractory multi-principal element alloys (RMPEAs) are promising candidates for replacing Ni-based superalloys in high temperature gas turbine engines due to their high melting temperatures. However, these alloys generally exhibit poor oxidation resistance, and will therefore require oxidation-resistant bond coatings, which historically have provided protection via formation of a dense alumina scale. Unfortunately, current alumina-forming bond coat alloys have inadequate temperature capabilities and are thermochemically incompatible with state-of-the-art RMPEAs, motivating the design of new protective bond coatings. Thermodynamic modeling (CALPHAD) and machine learning-based clustering were used to select promising alloys in the Nb-Mo-Ti-Al composition space. Alloys were then synthesized via arc melting for evaluation. Alloys that oxidized favorably to form a continuous and adherent alumina scale at 1400°C under isothermal conditions will be presented. Cyclic and kinetic oxidation studies and microstructural evolution across a range of temperature will also be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Surface Modification and Coatings, High-Temperature Materials, Other |