About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
|
| Presentation Title |
Finding the ‘right’ boundary: grain boundary-stress fundamental zones |
| Author(s) |
Fernando Daniel Daniel Leon Cazares, Coleman Alleman, Andrew Polonsky |
| On-Site Speaker (Planned) |
Fernando Daniel Daniel Leon Cazares |
| Abstract Scope |
The strain incompatibilities that develop at grain boundaries upon deforming a material are paramount to its mechanical response. Yet, for any given stress state, exploring the whole multi-dimensional space of grain boundaries and stress orientations remains infeasible. By taking advantage of the underlying symmetries of crystals and stress tensors, the current work demonstrates that for every bicrystal (disorientation and boundary plane) and remote stress, there exists a fundamental zone that uniquely captures all possible stress states. This facilitates the statistical analysis of grain boundary behaviors, and offers new and intuitive plotting capabilities. Moreover, we apply continuum models of bicrystal stresses over grids spanning the entire grain boundary-uniaxial stress orientation space to assess the role of incompatibility stresses on slip localization and intergranular fracture in cubic metals. The results of this work improve our fundamental understanding of crystalline interfaces and facilitate the study of grain boundary-assisted material degradation. |