| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Interfaces and Phase Transformations
|
| Presentation Title |
A Phase Field Dislocation Dynamics Model in Heterogeneous Crystalline Media |
| Author(s) |
Shuozhi Xu, Irene Beyerlein |
| On-Site Speaker (Planned) |
Shuozhi Xu |
| Abstract Scope |
Understanding dislocation dynamics in heterogeneous crystalline media necessitates modeling of plastic deformation in the vicinity of traction-free surfaces and interfaces. For example, in metals, voids, grain boundaries, and bimetal interfaces can impede dislocation gliding and hence contribute to strain hardening. While the atomistic simulation method is desirable in modeling dislocation dynamics in these cases, the simulation cells are usually at the nano-scale due to the high computational cost. Here, we develop a phase-field dislocation dynamics (PFDD) model that takes into account free surfaces and interfaces by employing Eshelby’s equivalent inclusion method. In this model, the heterogeneities with a general geometry and plastic deformation on general slip planes progress hand in hand. We use the PFDD model to study static dislocations in adjacent to surfaces/interfaces as well as slip interactions between dislocation and voids/interfaces. Simulation results are benchmarked against atomistic simulations and analytical solutions. |