| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Bcc-Superalloys
|
| Presentation Title |
Understanding Refractory Metal High Entropy Superalloys through systematic design |
| Author(s) |
Tamsin Whitfield, Ed Pickering, James Miller, Rosie Mellor, Howard Stone, Nick Jones |
| On-Site Speaker (Planned) |
Tamsin Whitfield |
| Abstract Scope |
Refractory Metal High Entropy Superalloys (RSAs) have the potential to supersede Ni-based superalloys in high temperature structural applications. Alloys such as AlMo0.5NbTa0.5TiZr have exhibited good high temperature compressive yield strengths and competitive densities, as well as microstructures that contain crystallographically related ordered and disordered phases. This finescale B2-bcc microstructure is believed to be responsible for their superior high temperature strength. However, typically, RSAs comprise of ordered matrices with solid solution precipitates and can be prone to the formation of intermetallic phases, raising concerns about limited ductility. In order to design improved RSAs an understanding of the mechanisms that determine their microstructures and routes for controlling them are crucial. Here we report on how the microstructure and intermetallics that form within AlTaTiZr RSA systems are affected by systematic changes in Al and time at elevated temperature. These results highlight opportunities and challenges for designing RSAs with a ductile matrix. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Phase Transformations, High-Temperature Materials |