| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Chemistry and Physics of Interfaces
|
| Presentation Title |
Exploring the Analogy Between Grain Boundaries and Brownian Ratchets |
| Author(s) |
Jian Han, Caihao Qiu, Maik Punke, Yuan Tian, Ying Han, Siqi Wang, Yishi Su, Marco Salvalaglio, Xiaoqing Pan, David Srolovitz |
| On-Site Speaker (Planned) |
Jian Han |
| Abstract Scope |
Grain boundary (GB) motion underlies manifold kinetic behaviors of crystalline materials. In this talk, we will examine the dynamics of GB motion from a new perspective – the analogy between GBs and Brownian ratchets. Brownian ratchets are devices that support unidirectional transport under nonequilibrium fluctuations. Our study reveals two major findings. First, the mobilities of nearly all non-symmetric GBs are migration-direction dependent. This is demonstrated by extensive simulations on diverse types of GBs under different driving forces in bicrystal and half-loop microstructures and rationalized by a Markov chain analysis. Second, a non-symmetric GB exhibits unidirectional motion in response to oscillations in driving force or temperature – this is directly derived from the GB-Brownian ratchet analogy. We validate this point by both atomistic simulations (molecular dynamics and phase field crystal) and scanning transmission electron microscopy observations. We also explore the implications of GB ratchet behavior for microstructure tailoring through thermomechanical processing. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Thin Films and Interfaces, Modeling and Simulation, |