| Abstract Scope |
“Microstructure” refers to the large number of crystal grains and their boundaries that make up metals and alloys. A material’s ability to accommodate stress induced through mechanical loads is dependent on the ease with which dislocations can move through the microstructure to relieve accumulated stress. Grain boundaries (GBs) are the largest impediment to this motion. For example, dislocations can pile-up against GBs, building localized internal stress regions that work-harden the material, and are precursors to damage nucleation. Understanding and predicting dislocation-GB interactions are key for capturing mechanical response, but they are also incredibly complex in part due to the vast number of possible GBs and corresponding dislocation interactions. This talk will focus on recent multiscale modeling efforts addressing dislocation-GB interactions, with particular focus on a mesoscale approach called phase field dislocation dynamics. Connections to atomistic efforts will also be discussed, along with methods/approaches that can be used to scale information. |