| About this Abstract |
| Meeting |
TMS Specialty Congress 2025
|
| Symposium
|
The 7th International Congress on 3D Materials Science (3DMS 2025)
|
| Presentation Title |
Grain Boundary Migration in Mesoscale Polycrystals |
| Author(s) |
Zipeng Xu, Robert Suter, Gregory Rohrer |
| On-Site Speaker (Planned) |
Zipeng Xu |
| Abstract Scope |
During thermally activated grain growth, the grain boundary migrates to reduce the system's total excess free energy. Although the classical theory describes the migration behavior in bicrystals, recent studies show that this is not the case in polycrystals. In this talk, we will discuss grain boundaries’ migration behavior in polycrystals from impurities and energy anisotropy effects, using two high-energy diffraction microscopy (HEDM) measured polycrystals with multiple time steps. We found that, both on average and locally around the triple junction, grain boundary energy anisotropy affects the grain growth process such that low energy grain boundaries tend to replace and grow at the expense of neighboring high energy grain boundaries. With those observations, we proposed a new mechanism of grain boundary migration, which potentially can explain the inconsistency from the classical theory. The findings suggest the importance of energy anisotropy during grain growth. |
| Proceedings Inclusion? |
Undecided |