About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
|
| Presentation Title |
Unraveling the Dynamics of Grain Boundary Transformations |
| Author(s) |
Fadi Abdeljawad |
| On-Site Speaker (Planned) |
Fadi Abdeljawad |
| Abstract Scope |
Recent experimental findings revealed grain boundary (GB) phases in a wide range of polycrystalline materials systems. However, the dynamics of GB transformation remain largely unexplored especially in conditions where GBs serve as sources/sinks of point defects. Here, we employ large scale atomistic simulations to investigate GB structural transformation and phase evolution of twist boundaries in Tungsten. We observe a spontaneous transformation of a twist GB into coexistent boundary phases with distinct dislocation networks. At elevated temperatures, these GB phases undergo coarsening in which their feature size increases with time. Atomistic simulations employing the synthetic driving force reveal a strong correlation between GB phase evolution and high temperature boundary migration rates. Our results highlight the complex nature of GB phase transformations and their role in controlling interfacial properties and, as a result, microstructure evolution during processing or under service conditions. |