About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Refractory Metals 2026 – A Memorial to Todd Leonhardt
|
| Presentation Title |
Mechanical Effects of Interstitial-Induced Metastability in Group IV-Based Refractory Alloys |
| Author(s) |
Israel Reimer, Nicolò Maria della Ventura, Arda Genc, Ravit Silverstein |
| On-Site Speaker (Planned) |
Israel Reimer |
| Abstract Scope |
The development of materials for extreme environments increasingly relies on engineering sub-micron-scale microstructures for precise performance tuning. Balancing strength and ductility has increased interest in body-centered cubic refractory multi-principal element alloys (RMPEAs), valued for their high melting points, strength, and hardness. Group IV-based RMPEAs with dilute interstitial additions show promise for improved mechanical integrity, though key strengthening mechanisms remain unclear. A key study of the HfNbTaTiZr alloy, which exhibits high strength and ductility at room temperature and 1200 °C but suffers embrittlement at 800 °C due to precipitate formation, highlights the need to understand phase equilibria and deformation mechanisms at elevated temperatures. In this study, we perform in situ nanomechanical testing in a transmission electron microscope (TEM) to study phase evolution and corresponding deformation mechanisms. Coupling this with 4DSTEM enables the correlation of subtle microstructural and misfit strain changes with dislocation dynamics, offering insights into RMPEAs with tailored properties for extreme environments. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Mechanical Properties, High-Entropy Alloys, High-Temperature Materials |