|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Deformation and Transitions at Interfaces
||Atomistic Simulation Algorithm for Studying Dislocation Glide Loop – Grain Boundary Interactions in Aluminum
||Khanh Dang, Laurent Capolungo, Douglas Spearot
|On-Site Speaker (Planned)
To study the fundamental nature of dislocation glide loop – grain boundary interactions, atomistic simulations are commonly employed; however, there are limitations to current approaches concerning the generation and propagation of dislocation glide loops. The goal of this work is to develop an atomistic simulation framework for studying dislocation – grain boundary interactions that allows specific dislocation glide loops to be driven into grain boundaries at realistic velocities. First, a bisection algorithm combined with energy minimization methods is used to determine the stabilizing stress of dislocation glide loops as a function of loop radius. Second, the bisection algorithm is extended to molecular dynamics and used to determine the minimum required shear stress to expand dislocation loops at different temperatures. Third, dislocation glide loops are driven into different symmetric tilt grain boundaries. The results from this analysis provide insights on the mechanisms of dislocation glide loop – grain boundary interactions.