About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys V: Mechanical Behavior
|
| Presentation Title |
Atomic-level defects on dislocation lines and their role in refractory complex alloy strength |
| Author(s) |
Jaime Marian |
| On-Site Speaker (Planned) |
Jaime Marian |
| Abstract Scope |
Chemically complex alloys (CCA) have the potential for superior mechanical strength compared to their pure metal or dilute alloy counterparts. In particular, refractory CCA have been seen to display exceptional strengths up to very high temperatures. While the reasons behind this superior strength are varied, we have developed mesoscale models that point to atomic-level defects induced by chemical complexity as some of the most potent strengthening factors. These atomic-level defects can manifest themselves as standard dislocation features, such as kinks, cross-kinks and jogs, which drastically change how dislocations respond to glide stresses. Our models, which capture atomic lengths scales over diffusive time scales, reveal that thermal cross kinks and double jogs can result in noticeable increases in critical glide stresses for screw and edge dislocations up to elevated temperatures, providing a partial explanation to the high mechanical strengths measures in these materials. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, High-Entropy Alloys, Modeling and Simulation |