An improved method to model dislocation self-climb

Fengxian Liu, Alan Cocks, Simon P.A. Gill, Edmund Tarleton*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)

Abstract

Dislocations can provide short circuit diffusion paths for atoms resulting in a dislocation climb motion referred to as self-climb. A variational principle is presented for the analysis of problems in which fast dislocation core diffusion is the dominant mechanism for material redistribution. The linear element based self-climb model, developed in our previous work [1] Liu, Cocks and Tarleton (2020 J. Mech. Phys. Solids 135 103783), is significantly accelerated here, by employing a new finite element discretisation method. The speed-up in computation enables us to use the self-climb model as an effective numerical technique to simulate emergent dislocation behaviour involving both self-climb and glide. The formation of prismatic loops from the break-up of different types of edge dislocation dipoles are investigated based on this new method. We demonstrate that edge dipoles sequentially pinch-off prismatic loops, rather than spontaneously breaking-up into a string of loops, to rapidly decrease the total dislocation energy.

Original languageEnglish
Article number055012
Number of pages21
JournalModelling and simulation in materials science and engineering
Volume28
Issue number5
DOIs
Publication statusPublished - 4 Jun 2020
Externally publishedYes

Keywords

  • core diffusion
  • pipe diffusion
  • self-climb
  • variational principle
  • n/a OA procedure

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