|About this Abstract
||MS&T23: Materials Science & Technology
||Interface-mediated Phenomena in Structural Materials
||Influence of Grain Boundary Sliding on Plastic Deformation in FCC Nanocrystalline Metals
||Jonathan Cappola, Jian Wang, Lin Li
|On-Site Speaker (Planned)
A grain boundary dislocation-density-based crystal plasticity model has recently been developed for FCC nanocrystalline metals. The model is based on a thermally-activated dislocation depinning mechanism and has now been extended to include co-operative plastic deformation via grain boundary sliding (GBS). The previous model revealed that in the absence of grain-boundary-mediated plasticity, dislocation-mediated plasticity alone cannot account for the increased strain-rate sensitivity as grain size reduces towards the amorphous limit, nor is any shear localization behavior observed. GBS is introduced in a kinematically consistent manner, following the grain-uniform plastic deformation assumption of the previous model, accounting for the additional rotation induced by GBS. The impact of GBS on the plastic deformation response of FCC nanocrystalline metals is studied, with particular focus on the resulting mechanical strength, prevalence for shear instability/localization, and texture evolution.