Power-Law Creep from Discrete Dislocation Dynamics

Abstract

We report two-dimensional discrete dislocation dynamics simulations of combined dislocation glide and climb leading to `power-law' creep in a model aluminum crystal. The approach fully accounts for matter transport due to vacancy diffusion and its coupling with dislocation motion. The existence of quasi-equilibrium or jammed states under the applied creep stresses enables observations of diffusion and climb over time scales relevant to power-law creep. The predictions for the creep rates and stress exponents fall within experimental ranges, indicating that the underlying physics is well captured.

5 pages, 5 figures

References in corpus (1)

• Dislocation dynamics simulations with climb: kinetics of dislocation loop coarsening controlled by bulk diffusion

Cited by in corpus (4)

• Quantifying the effect of hydrogen on dislocation dynamics: A three-dimensional discrete dislocation dynamics framework
• Dislocation climb models from atomistic scheme to dislocation dynamics
• Temperature Dependence of the Yield Strength of Aluminum Thin Films: Multiscale Modeling Approach
• Dislocation dynamics formulation for self-climb of dislocation loops by vacancy pipe diffusion