About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Chemistry and Physics of Interfaces
|
| Presentation Title |
Grain Boundary Dynamics: A Disconnection-based Continuum Model Integrating Capillary and Stress Effects for Microstructure Evolution |
| Author(s) |
Caihao Qiu, Marco Salvalaglio, David Srolovitz, Jian Han |
| On-Site Speaker (Planned) |
Caihao Qiu |
| Abstract Scope |
Polycrystalline materials consist of single-crystal grains with different crystallographic orientations separated by grain boundaries (GBs). The evolution of their microstructure is driven by GB motion; the equation of motion (EOM) for GBs is essential for understanding and controlling microstructure evolution. Traditionally, GB motion is modeled as mean curvature flow, considering the reduction of total GB free energy. However, this model often fails for metals, as GB motion can generate internal stress, and external stress can further influence GB motion. To capture these mechanical effects, we reconcile capillarity and stress effects by considering the gliding of disconnections—line defects constrained on GBs with both step and dislocation character. We propose an EOM for arbitrarily curved GBs that accounts for GB migration mechanism, i.e., disconnection gliding. Numerical simulations based on this EOM investigate how dislocation characteristics of disconnections influence the evolution of bicrystal and polycrystalline microstructures, e.g., GB faceting and grain rotation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Modeling and Simulation, |