About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
|
Computational Thermodynamics and Kinetics
|
Presentation Title |
Migration of GB Phases in Tungsten |
Author(s) |
Daniel Moore, Enze Chen, Mark Asta, Timofey Frolov, Fadi Abdeljawad, Rob Rudd |
On-Site Speaker (Planned) |
Daniel Moore |
Abstract Scope |
The observable properties of polycrystalline materials are influenced by the chemical and structural makeup of their grain boundaries (GBs). Recent findings have identified distinct GB phases with unique atomic arrangements even for GBs with the same geometry. However, the impact of GB phases on boundary dynamics remains poorly understood. In this study, we leverage a recently developed structure prediction algorithm along with molecular dynamics simulations to identify various GB phases in low-angle twist GBs in Tungsten. Our results reveal that these GB phases are composed of distinct dislocation networks. Using a synthetic driving force, we evaluate the mobilities of various GB phases and reveal transitions between mobile and immobile GBs for the same boundary geometry. Overall, our approach opens new avenues to explore GB structure-property linkages. This work was performed in part under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. |
Proceedings Inclusion? |
Planned: |
Keywords |
Modeling and Simulation, |