About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
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Bridging Scales: Deformation and Damage Mechanisms in Microstructurally and Compositionally Complex Metallic Alloys
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| Presentation Title |
Microstructural Stability of Re and Ru Modified A2 + B2 Refractory High Entropy Alloys |
| Author(s) |
Liu Yang, Sandipan Sen, Vikram Raja Jothi, Daniel Schliephake, Martin Heilmaier, Alexander Kauffmann |
| On-Site Speaker (Planned) |
Liu Yang |
| Abstract Scope |
Refractory high entropy alloys featuring an A2 matrix with B2 precipitates mimic the microstructure principle of Ni-based superalloys. 27.3Ta-27.3Mo-27.3Ti-8Cr-10Al (at.%) for example forms a stable A2 + B2 microstructure with a solvus temperature of around 1070 °C. The creep resistance up to 1030 °C is comparable to CMSX-4. However, creep resistance is limited by the low solvus temperature. Inspired by the thermal stability of Re- and Ru-stabilized B2 phases, this study investigates alloys with Re and Ru additions (1.5 - 5 at.%). Differential scanning calorimetry shows that both Re and Ru effectively raise the solvus temperature, with a more pronounced enhancement towards 5 at.%. Microstructural analyses of aged and quenched specimens confirm the improved B2 stability. Furthermore, critical Re and Ru concentrations are identified for preserving the disordered A2 matrix, offering insight for future high-temperature alloy design. Misfit change and partitioning behavior along with morphological changes during ageing are discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, High-Temperature Materials, Other |