About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Hume-Rothery Symposium: Interface Structure and Properties: Impact on Microstructure Evolution
|
| Presentation Title |
Revisiting Grain Growth: The Impact of Internal Stress on Grain Boundary Migration |
| Author(s) |
Caihao Qiu, David J. Srolovitz, Gregory S. Rohrer, Jian Han, Marco Salvalaglio |
| On-Site Speaker (Planned) |
Caihao Qiu |
| Abstract Scope |
Grain growth describes the increase in mean grain size during the annealing of polycrystals, traditionally attributed to capillarity, where grain boundaries (GBs) migrate toward centers of mean curvature (i.e., mean curvature flow, including its anisotropic extensions for GB energy and mobility). However, this mean curvature flow model has proven overly simplistic and inconsistent with recent experimental and atomistic simulation data. We demonstrate that internal stress generated by GB shear coupling during GB migration is a primary factor causing deviations from the conventional curvature-based model. We employ a bicrystallography-respecting continuum model for GB migration that utilizes a diffuse-interface approach. Our findings, validated through atomistic simulations, show that the scatter in the GB curvature-velocity relationship closely aligns with experimental results for grain growth in 3D polycrystals, a phenomenon inadequately explained by previous models. This work highlights the critical role of mechanical effects in understanding grain growth in crystalline solids. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Computational Materials Science & Engineering, |