INTRODUCING DISLOCATION CLIMB IN DISCRETE DISLOCATION DYNAMICS

摘要

We report a method to incorporate diffusion-controlled dislocation climb in a 3-dimensional discrete dislocation dynamics (DDD) simulation for fcc metals. In this method, the diffusion theory of vacancies is coupled to the DDD, to obtain the climb rate of the dislocation segments. The model capability to reproduce the motion of climbing dislocations is demonstrated by calculating several test-cases of pure climb-related phenomena As test cases, the DDD is used to study the activation of Bardeen-Herring sources upon the application of an external stress or under vacancy supersaturation. Loop shrinkage and expansion due to vacancy emission or absorption is shown to be well described by our model.