About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Thermo-Mechanical Processing of Refractory Alloys
|
| Presentation Title |
Influence of Thermo-Mechanical Processing on Microstructure and Mechanical Behavior of HfTiZrNbx Alloys |
| Author(s) |
Joseph Tamirka Bawah, Peter K. Liaw, Eric. A. Lass |
| On-Site Speaker (Planned) |
Joseph Tamirka Bawah |
| Abstract Scope |
Refractory high-entropy alloys, BCC-structured, offer promising strength and stability for advanced high-temperature applications. This study investigates the effect of thermal processing and Nb content on the microstructure and mechanical behavior of HfTiZrNbx (x = 0.3 - 0.8) alloys. The as-cast alloys possess single-phase BCC microstructures and exhibit strengths exceeding 1000 MPa. However, ductility is limited to ~14 % for x > 0.5 and even less for x < 0.5. Homogenization at 1200°C retains the BCC structure, but strength is decreased considerably. Ductility is improved considerably with tensile elongations of >10 % for x < 0.5 alloys. Aging at 725°C promotes the precipitation of a second phase, HCP, and brittle behavior is observed. For alloys with x < 0.5, the brittle behavior is attributed to the presence of the HCP precipitates, while intergranular failure is the cause of failure for alloys with x > 0.5. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Mechanical Properties, Phase Transformations |