About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Chemistry and Physics of Interfaces
|
| Presentation Title |
Phases and Phase Transformations in Twist Grain Boundaries in Tungsten |
| Author(s) |
Daniel Moore, Enze Chen, Flynn Walsh, Mark Asta, Rob Rudd, Fadi Abdeljawad, Timofey Frolov |
| On-Site Speaker (Planned) |
Daniel Moore |
| Abstract Scope |
Polycrystalline tungsten is a leading candidate for first-wall components due to its high melting point, radiation resistance, and low sputtering yield. While prior studies have extensively investigated grain boundary (GB) structures and their impact on material properties, most rely on the γ-surface method that constrains GB atomic density—a limitation when modeling extreme environments where GBs can serve as sources/sinks of point defects. In this work, we employ a recently developed grand canonical interface predictor to systematically explore phase transitions in [001] twist boundaries in tungsten. In the low-angle regime, we identify GB phases with distinct dislocation networks. Our findings demonstrate that accounting for variable atomic density is essential for accurately predicting GB behavior and, ultimately, the performance of tungsten polycrystals under irradiation and high-temperature conditions. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Modeling and Simulation, Other |