|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Computational Design and Simulation of Materials (CDSM 2018): Meso/Macroscale Simulations
||Mesoscale Modeling of Mixed-type Dislocations in Al
||Shuozhi Xu, Jaber R. Mianroodi, Abigail Hunter, Irene J. Beyerlein, Bob Svendsen
|On-Site Speaker (Planned)
Mixed-type dislocations are prevalent in face-centered cubic metals and play an important role in plastic deformation. Their key characteristics, such as the core structure and core energy, cannot simply be extrapolated from those of dislocations with 0 and 90 (screw/edge) character angles. Most studies, however, have been devoted to those of pure edge/screw type. In this work, we explore the core structure/energy of mixed-type dislocations using a variety of meso-scale dislocation models, i.e., phase-field dislocation dynamics, atomistic phase-field microelasticity, and concurrent atomistic-continuum modeling. Results are benchmarked against molecular statics and possible sources of errors in these continuum calculations are discussed. A dislocation loop is then modelled using these approaches to shed light on their abilities to describe more realistic mixed-type configurations, potentially assisting in designing stronger metallic materials.
||Planned: Supplemental Proceedings volume