| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Chemistry and Physics of Interfaces
|
| Presentation Title |
Interplay Between Dislocation Type and Local Structure in Dislocation-Twin Boundary Reactions in Cu |
| Author(s) |
Khanh Dang, Avanish Mishra, Sumit Suresh, Nithin Mathew, Edward M Kober, Saryu Fensin |
| On-Site Speaker (Planned) |
Khanh Dang |
| Abstract Scope |
The nature of dislocation-GB interaction and its dependence on GB structure is not well-understood. Dislocation-twin boundary interactions in Cu are systematically studied using molecular dynamics simulations. Importantly, the study considers both metastable and minimum-energy configurations of these twin boundaries to explore the impact of local atomic arrangements on dislocation-twin boundary interactions. Two distinct mechanisms for dislocation transmission through twin boundaries are found: partial dislocation reaction versus full dislocation absorption followed by emission in the adjacent grain. The observed interaction mechanisms are found to be similar in the case of other symmetric tilt GBs with similar local structural units. Even subtle changes of the coherent twin boundary (metastable vs minimum-energy structure) alter the outcome of the dislocation-twin boundary interaction. Specifically, the screw dislocation can transmit through metastable but not the minimum-energy coherent twin boundary. This further highlights the important role of GB structure, especially those metastable structures, in material strength modeling. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Computational Materials Science & Engineering, |