| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
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| Symposium
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Advances in Multi-Principal Element Alloys IV: Mechanical Behavior
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| Presentation Title |
Stability of the B2 Phase in Al-Nb-Ta-Ti-Zr Refractory High-Entropy Superalloys: Resolving Identification Conflicts and Offering Practical Solutions |
| Author(s) |
An-Chen Fan, Yun-Syuan Chen, Chong-Chi Chi, Daniel B. Miracle, Jessie Shiue, Pai-Chia Kuo, Chih-Hao Hsu, Kai-Cheng Yang , Ming-Yen Lu , Ming-Hung Tsai |
| On-Site Speaker (Planned) |
Ming-Hung Tsai |
| Abstract Scope |
Refractory high-entropy superalloys (RHESAs) with a superalloy-like A2+B2 microstructure show great potential for high-temperature applications. However, the stability conditions of the B2 phase, which is essential for the integrity of the microstrucutre, remain unclear. Here, we conduct a comprehensive investigation into the stability of the B2 phase in the Al-Nb-Ta-Ti-Zr system, the most representative RHESA system. Three key compositions covering the potential B2+BCC region were selected as model alloys for in-depth analysis. Surprisingly, our findings reveal that the B2 phase is not stable in these alloys above 700°C. Two primary factors contribute to this misconception: quench-induced nanoscale B2, which is inherently unstable at elevated temperatures, and the B82 phase, which is distinct from B2 but often has similar SADPs. We aim to raise awareness within the community regarding the challenges associated with accurately identifying the B2 phase in the Al-Nb-Ta-Ti-Zr system, as well as other RHEA systems, and provide potential solutions to address these challenges. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Other, |