|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Computational Design and Simulation of Materials (CDSM 2018): Meso/Macroscale Simulations
||Macro and Meso-scale Performance of a Super-dislocation Model for Tracking Dislocation Evolution and Interactions
||David Fullwood, Landon Hansen, Hyuk Jong Bong, Eric R Homer, Robert Wagoner
|On-Site Speaker (Planned)
Despite various advances in modeling the behavior of dislocations at the meso-scale, the accurate prediction of bulk dislocation evolution at the sub-grain level remains a challenge. One particular approach – the super-dislocation, or SD model – accounts for elastic forces between populations of dislocations, and has enjoyed various successes in terms of predicting macroscopic material behavior. These accomplishments include prediction of the Hall Petch and Bauschinger effects and the elastic-plastic transition. This paper reviews the SD model performance at the macro-scale, and evaluates whether it accurately reflects dislocation behavior at the sub-grain-level. Cross-correlation EBSD is used to map geometrically necessary dislocation content in oligocrystals of tantalum in order to compare simulated predictions with experimental measurements. The study focuses particularly on grain boundaries, where GND buildup often occurs.
||Planned: Supplemental Proceedings volume