| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Deformation and Transitions at Grain Boundaries VII
|
| Presentation Title |
Dislocation Interactions and the Formation of Low-angle Grain Boundary |
| Author(s) |
Pranay Chakraborty, Tengfei Ma, Abigail Hunter, Yinan Cui, Lei Cao |
| On-Site Speaker (Planned) |
Pranay Chakraborty |
| Abstract Scope |
The simplest low-angle grain boundaries (GB) is the tilt GB that involves an array of pure edge dislocations. However, the dynamic process of the formation of low-angle GB or tilt GB is difficult to capture. In this work, we use a first-principles informed phase-field dislocation dynamics simulations to capture one possible formation mechanism of the tilt GB. We found that the morphology of the dislocations changes dramatically with interplannar distance between them. When the interplanar distance is large, dislocations form oval shape due to the lower self-energy of screw dislocations. When the interplanar distance is small, the initial dislocations gradually form an array of edge dislocations and thus a tilt GB. We found that the underlying mechanism is the strong elastic interaction between the edge components of the dislocation loops, which is verified by the analytical solution of linear elasticity. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |