About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Algorithm Development in Materials Science and Engineering
|
Presentation Title |
M-12: Discrete Stochastic Model of Point Defect-dislocation Interaction
for Simulating Dislocation Climb |
Author(s) |
Cameron Mcelfresh, Yinan Cui, Sergei L. Dudarev, Giacomo Po, Sylvie Aubry, Nicolas Bertin, Jaime Marian |
On-Site Speaker (Planned) |
Cameron Mcelfresh |
Abstract Scope |
Dislocation climb is an important high-temperature process in metals plasticity, responsible for
the phenomena such as creep, swelling, or hardening. The point-wise discrete nature of vacancies
(and/or self-interstitials) confers a highly discrete nature to the climb dynamics, which is
also strongly affected by elastic forces. We develop a kinetic Monte Carlo model that captures vacancy generation and transport kinetics acting in conjunction with the evolving elastic fields provided by discrete dislocation dynamics (DDD) simulations. The two models are coupled via the applied stresses and stress gradients generated by dislocation structures at vacancy locations. This method is applied to study elementary climb processes in body-centered cubic iron and furnish climb mobility functions to be used in parametric dislocation dynamics and/or crystal plasticity simulations. We then demonstrate non-conservative plastic bypass of spherical precipitates by edge dislocations and demonstrate algorithmic extensions to use this method in parallelized DDD codes. |
Proceedings Inclusion? |
Planned: |
Keywords |
Modeling and Simulation, High-Temperature Materials, Computational Materials Science & Engineering |