| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys IV: Mechanical Behavior
|
| Presentation Title |
Microstructural Evolution and Mechanical Behavior of HfTiZrNbx Refractory High-Entropy Alloys Under Different Annealing Conditions |
| Author(s) |
Joseph Tamirka Bawah, Peter K. Liaw, Eric. A. Lass |
| On-Site Speaker (Planned) |
Joseph Tamirka Bawah |
| Abstract Scope |
Refractory high-entropy alloys (RHEAs) with a body-centered-cubic (BCC) structure offer excellent high-temperature softening resistance but often suffer from poor ductility at room temperature. Typically studied in an as-cast condition, RHEAs show widely varying mechanical properties when annealed. This study investigates the effects of thermal processing and Nb content on the mechanical behavior and microstructure of HfTiZrNbx alloys. For alloys with a high Nb content (x > 0.6) that are annealed between 800-1200°C, a single-phase BCC microstructure is expected; nevertheless, the mechanical properties may be affected by chemical short-range ordering, which may increase with decreasing annealing temperature. When the Nb-content is (x < 0.5), HCP becomes stable below 900°C, leading to BCC-to-HCP transformation-induced plasticity (TRIP) behavior in single-phase BCC alloys quenched from elevated temperatures and two-phase BCC+HCP microstructures when annealed at intermediate temperatures. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, High-Entropy Alloys, |