|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation
||BB-2: A First Prediction of Dislocation Patterns in Single Crystals Using Continuum Dislocation Dynamics Theory
||Shengxu Xia, Anter El-Azab
|On-Site Speaker (Planned)
We report a first prediction of dislocation cell structure in FCC crystals, which was made using continuum dislocation dynamics theory. In this theory, the dislocation density evolution is governed by the rates of transport, cross slip and reactions, which are captured in kinetic equations derived based on statistical mechanics. Novel finite element method was used to solve the kinetic equations coupled with crystal mechanics. Cross slip process and dislocation reactions at short range are treated using a Monte Carlo approach. It is found that dislocation cells form at strains as low as 1% and that they evolve following the similitude law: the average size is inversely proportional to the applied stress. Simulations showed that cross slip is essential in the formation and evolution of dislocation cells. The hardening behaviour, dislocation density evolution, slip patterns and GND density are discussed in conjunction with X-ray data and discrete dislocation dynamics simulations.
||Planned: EPD Congress Volume