About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Deformation and Transitions at Grain Boundaries VII
|
Presentation Title |
An Atomistic Survey of Grain Boundary Migration Mechanisms in BCC Fe |
Author(s) |
Ian Chesser, Sutach Ratanaphan, Brandon Runnels, Elizabeth Holm |
On-Site Speaker (Planned) |
Ian Chesser |
Abstract Scope |
In this work, we examine the migration mechanisms of 408 BCC Fe bicrystals driven by a shear stress and energy jump driving force with variable boundary conditions. A zoo of migration mechanisms including sliding, shear coupled motion, motion coupled to vacancy ejection, boundary splitting, and zig zag motion are analyzed. We seek to unify these phenomena in a continuum model for grain boundary yield and mobility inspired by models for slip selection in crystal plasticity. Yield statistics for BCC boundaries are compared to yield statistics from the canonical Olmsted FCC Ni dataset. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |