4.7 Article

Phase field model for self-climb of prismatic dislocation loops by vacancy pipe diffusion

Journal

INTERNATIONAL JOURNAL OF PLASTICITY
Volume 141, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2021.102977

Keywords

Phase field model; Dislocation self-climb; Pipe diffusion; Conservative motion; Asymptotic analysis

Funding

  1. National Natural Science Foundation of China [11801214]
  2. Research Excellence Grant from University of Connecticut

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This paper presents a phase field model for simulating the self-climb motion of prismatic dislocation loops via vacancy pipe diffusion driven by elastic interactions. The model has the advantage of automatically handling topological and geometrical changes, and numerical simulations show excellent agreement with experimental observations.
In this paper, we present a phase field model for the self-climb motion of prismatic dislocation loops via vacancy pipe diffusion driven by elastic interactions. This conserved dynamics model is developed under the framework of the Cahn-Hilliard equation with incorporation of the climb force on dislocations, and is based on the dislocation self-climb velocity formulation established in Ref. (Niu et al., 2017). The phase field model has the advantage of being able to handle the topological and geometrical changes automatically during the simulations. Asymptotic analysis shows that the proposed phase field model gives the dislocation self-climb velocity accurately in the sharp interface limit. Numerical simulations of evolution, translation, coalescence and repelling of prismatic loops by self-climb show excellent agreement with discrete dislocation dynamics simulation results and the experimental observation.

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