| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
|
| Presentation Title |
Grain Boundary Migration in the Presence of a Liquid Phase |
| Author(s) |
Zipeng Xu, Jun Sun, Jette Oddershede, Jules M. Dake, Carl E. Krill III, Gregory S. Rohrer |
| On-Site Speaker (Planned) |
Zipeng Xu |
| Abstract Scope |
An Al-5wt%Cu polycrystal was annealed above the liquidus temperature for 10 time intervals. After each annealing interval, a 3D orientation map was measured at room temperature using LabDCT, a non-destructive X-ray microscopy technique. 5D boundary properties (area, energy, curvature, and velocity) were extracted from the microstructures. Although the grain boundary (GB) network developed in the presence of an interfacial liquid, which should act to minimize the interface energy anisotropy, the GB character distribution was found to be anisotropic and inversely related to the solid-state boundary energy. In addition, the GB velocity was correlated with the boundary curvature, as expected from the conventional isotropic theory of grain growth and coarsening. These results are contrasted with those from solid-state grain growth, where the boundary velocity is not correlated with curvature. This comparison supports the idea that the energy anisotropy disrupts the expected correlation between boundary curvature and velocity in solid-state grain growth. |