|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Ultrafine Grained Materials IX
||Understanding Effects of Dislocation Emissions and Crystallographic Textures on Grain-size Dependent Behavior of Nanocrystalline Metals
||Caizhi Zhou, Rui Yuan, Irene J. Beyerlein
|On-Site Speaker (Planned)
It is well known that nanocrystalline (NC) metals exhibit unique mechanical behaviors different from those of their coarse-grained counterparts. Previous studies have revealed that the mechanical behavior of NC metals is controlled by grain boundary (GB)-mediated dislocation processes. However, the influence of crystallographic texture on the mechanical behavior of NC metals has been overlooked in most studies. In this work, we develop a statistical GB dislocation source model to understand the effects of dislocation emissions and crystallographic textures on grain-size dependent behavior of nanocrystalline metals. To establish its impact on mechanical behavior, this GB source model is integrated into a 3D crystal plasticity finite element model for NC copper (Cu). In our calculations, the predicted stress-strain curves achieve quantitative agreement with experimental data across a wide range of average nanograin sizes. Further our study has revealed the relationship between crystallographic textures and the activation of slip events in NC Cu.