| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Deformation and Transitions at Grain Boundaries VII
|
| Presentation Title |
Phase Transitions in Grain Boundary Dynamics |
| Author(s) |
Kongtao Chen, Jian Han, David Joseph Srolovitz |
| On-Site Speaker (Planned) |
David Joseph Srolovitz |
| Abstract Scope |
Grain boundary (GB) migration, sliding, shear coupling, roughening,... are controlled by the formation and motion of disconnections - line defects with dislocation and step character. In many situations, disconnection dynamics are dominated by the step character. However, when the dislocation character is significant (as in all GB shear coupling scenarios), long-range elastic interactions become important.They are particularly significant at low temperature. However, as temperature increases, the long range interactions between disconnections are increasingly screened by other disconnections. There is a critical temperature where this screening is dominant and the long range interactions again becomes unimportant. This leads to a transition in many GB dynamical parameters, such as GB mobility. This transition is a manifestation of a Kosterlitz-Thouless 2D phase transition. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |