|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Computational Materials Science and Engineering for Nuclear Energy
||Multiscale Simulations of Sequential Dislocation/Obstacle Interactions in FCC Metals
||Shuozhi Xu, David L. McDowell, Irene J. Beyerlein
|On-Site Speaker (Planned)
Metallic components of nuclear reactors are subject to irradiation by a flux of fast neutrons, inducing clustered defects that interact with dislocations in materials. Since the dislocation pile-up stress fields are long range, modeling dislocation-obstacle interactions would be very expensive for brute force atomistic simulations. On the other hand, while linear elasticity theory in the context of discrete dislocation dynamics can provide a description of dislocation-obstacle interactions, approximations have to be made for short range interactions that involve the dislocation core structure, and description of interactions of subsequent dislocations with residual debris from prior interactions, as well as complex cross-slip and looping phenomena may be approximate, depending on the size of the obstacle. In this work, we perform multiscale simulations via the concurrent atomistic-continuum (CAC) method to study a sequence of multiple dislocations bypassing an obstacle, either a void or an unshearable precipitate.
||Planned: Supplemental Proceedings volume