| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces in Functional Materials: Fundamental Structure-Property-Performance Relationships
|
| Presentation Title |
The Impact of Metastable Grain Boundary States on Mobility in FCC Metal |
| Author(s) |
Yutong Bi, Ian Chesser, Elizabeth A. Holm |
| On-Site Speaker (Planned) |
Yutong Bi |
| Abstract Scope |
In this work, we study the influence of metastable states on grain boundary mobility with atomistic simulations. We apply synthetic driving force to three different ∑5(210) grain boundary structures (Normal Kites, Filled Kites, Split Kites) at a variety of temperatures and driving force magnitudes. The maximum density SK structure was found to have the highest mobility at low driving forces and lowest mobility at high driving forces. Meanwhile, a change in shear coupling mode and vacancy ejection was observed for SK at high driving forces. This change in grain boundary migration indicates a potential grain boundary phase transition. Moving boundaries were quenched to 0K framewise to calculate excess properties in order to determine the presence of a grain boundary phase transition. |