| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Deformation and Transitions at Grain Boundaries VII
|
| Presentation Title |
A New Approach to Modeling Grain Boundary Motion with Strongly Anisotropic Boundary Energy |
| Author(s) |
Brandon Runnels, Vinamra Agrawal |
| On-Site Speaker (Planned) |
Vinamra Agrawal |
| Abstract Scope |
Microstructure evolution is effectively modeled using the phase field method, but grain boundary (GB) energy anisotropy and orientation dependence induce complexity in constructing the Allen Cahn equation. Furthermore, determining an accurate estimate of free energy for GBs with arbitrary orientation is challenging due to the large space of GB configurations and relatively sparse knowledge of energy data. As such, even rudimentary simulations with orientation dependence are restricted to certain cases with well-known boundary energy. A method is developed for constructing the Allen-Cahn equation for GB migration including an orientation-dependent, nonconvex, anisotropic boundary energy. To incorporate realistic boundary behavior, the lattice-matching model is used to calculate boundary energy for arbitrary orientations, on-the-fly. It is shown that the phase field model accurately captures minimum energy morphology for multiple energy functionals, lengthscales are induced and controlled by the second order term, and experimentally observed microstructure is reproduced. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |