|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Deformation Induced Microstructural Modification
||Influence of grain boundaries on grain rotation during plastic deformation of bicrystals
||Timofey Frolov, Nicolas Bertin, Tomas Oppelstrup
|On-Site Speaker (Planned)
We use multimillion-atom molecular dynamics simulations to investigate the plastic deformation of bicrystals. We find that the grains of most bicrystals studied also rotate during plastic deformation and their asymptotic orientations can be predicted from single-crystal plasticity. We also identify a set of special boundaries that are exceptions to this rule. Our simulations show that grain boundaries are capable of influencing grain rotation, bulk dislocation density and flow stress. We show that this behavior strongly depends on the deformation rate as well as grain size and can be explained by considering a dynamic competition between deformation accommodation by the bulk plasticity and increase in the grain boundary energy due to the change in the crystal orientation. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
||Computational Materials Science & Engineering, Thin Films and Interfaces, Modeling and Simulation