|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Grain Boundaries and Interfaces: Metastability, Disorder, and Non-Equilibrium Behavior
||Faceting in Cylindrical Grain Boundaries
||Anqi Qiu, Ian Chesser, Elizabeth Holm
|On-Site Speaker (Planned)
Isolated cylindrical grains shrink spontaneously under curvature driving force at high temperatures. With molecular dynamics simulations, we have observed that the grains remain mostly cylindrical throughout the shrinking process, but facets can appear. It is difficult to identify and characterize the facets that appear during the shrinking process with current simulation methods, as the facets appear and disappear very fast. When a synthetic driving force (SDF) opposing the curvature driving force is applied to drive the motion of the grain boundary in the other direction, the grain will expand and exhibit certain clear facets that do not easily disappear with the continuing motions of the grain boundary. For some cylindrical grain boundaries, the facets form octagonal shapes. This study on the expansion and faceting of cylindrical grain boundaries will give new insights on the properties of cylindrical grain boundaries.
||Computational Materials Science & Engineering, Modeling and Simulation,