About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Hume-Rothery Symposium: Interface Structure and Properties: Impact on Microstructure Evolution
|
| Presentation Title |
A unified variational model for grain boundary dynamics incorporating microscopic structure |
| Author(s) |
Yang Xiang |
| On-Site Speaker (Planned) |
Yang Xiang |
| Abstract Scope |
Recent experiments, atomistic simulations, and theoretical predictions have identified various new types of grain boundary motions that are controlled by the dynamics of underlying microstructure of line defects (dislocations or disconnections). Different continuum models have been developed by upscaling from discrete line defect dynamics models under different settings to account for the specific detailed natures of the microscopic dynamics mechanisms. We propose a unified variational framework based on Onsager principle to account for all the underlying line defect mechanisms for the dynamics of both low and high angle grain boundaries and the associated grain rotations. The variational formulation employs the developed constraints of the dynamic Frank-Bilby equation that governs the microscopic line defect structures. This variational framework is able to recover the available models for different motions under different conditions, and provides an efficient basis for describing the collective behaviors of grain boundary networks at larger length scales. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, |