|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale III
||W-2: Analysis of Plastic Anisotropy in Nanotwinned Copper by a Statistical Dislocation Source Model
||Caizhi Zhou, Rui Yuan, Irene J. Beyerlein
|On-Site Speaker (Planned)
In the past decade, the coherent twin boundary has attracted lots of attention in the materials science field. This excitement derives from several reports of improvements in the ductility and work-hardening properties of nanocyrstalline metals. Equiaxed-grained copper (Cu) containing nanoscale twins exhibits nearly isotropic plasticity during deformation. In contrast, recent studies have shown that columnar-grained Cu with a high density of embedded nanoscale twins exhibits a strong anisotropic plastic behavior. In this study, we propose a statistical grain boundary (GB) dislocation source model to understand the relationship between the twin layer thickness and the anisotropic plastic behavior in columnar-grained copper. In our calculations, the predicted stress-strain curves achieve quantitative agreement with experimental data under different loading orientations with respect to the twin planes. We analyze the effects of dislocation source distributions, twin layer thicknesses and grain sizes on the simulations results.
||Planned: A print-only volume