| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Bcc-Superalloys
|
| Presentation Title |
Stability of Undesired AlxZry Ordered Omega Phases in Al-Containing Refractory High Entropy Superalloys |
| Author(s) |
Vishal Soni, Advika Chesetti, SriSwaroop Dasari, Abhishek Sharma, Oleg Senkov, Daniel Miracle, Rajarshi Banerjee |
| On-Site Speaker (Planned) |
Vishal Soni |
| Abstract Scope |
Al-containing refractory high entropy alloys (RHEAs) or refractory complex concentrated alloys (RCCAs) often exhibit a check-patterned BCC+B2 microstructure, similar to the FCC+L12 microstructure seen in Ni/Co base superalloys. Interest in these BCC+B2 microstructures is rapidly growing due to their promising balance of mechanical properties at elevated temperatures. However, these microstructures are often unstable and, upon long-term annealing, the B2 phase can transform into an ordered omega phase, which negatively impacts mechanical properties. This study investigates the stability of the BCC+B2 microstructure and the detrimental ordered omega phases in several Al-containing RHEAs at elevated temperatures (600°C-1400°C). The results are compared with CALPHAD-based predictions to understand phase stability, aiming to adjust alloy compositions for enhanced elevated temperature stability of the BCC+B2 microstructure while avoiding the formation of undesired phases. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, High-Temperature Materials, Phase Transformations |