The strengthening of metals by nano-scale obstacles is mainly attributed to the impediment to glide dislocations by these obstacles. Since it is difficult to observe the dislocation/obstacle interactions in experiments, directly modeling these processes is necessitated. Here, we first extend a phase-field dislocation dynamics (PFDD) model to take into account heterogeneities by employing Eshelby‚Äôs equivalent inclusion method. In this model, the heterogeneities with a general geometry and plastic deformation on general slip planes progress hand in hand. Then we conduct PFDD simulations to explore the interactions between a glide dislocation and a nano-obstable, which is either a void or an amorphous precipitate. The strengthening effect is quantified as a function of obstacle spacing, obstacle moduli, and matrix materials.  Simulation results are compared with analytical solutions.

Phase-field dislocation dynamics simulations of dislocation/obstacle interactions

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