Dislocation patterning: The role of climb in meso-scale simulations

B. Bakó, I. Groma, G. Györgyi, G. Zimányi

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

Simulation of parallel dynamics of edge dislocations in a 2D hexagonal lattice is carried out on a large scale by means of coarse graining, in the absence of external strain. In order to study the effect of climb on dislocation pattern formation, we allowed (i) isotropic (ii) biased (iii) only glide mobility. Moreover we annihilated dislocations with opposite Burgers vectors close to each other. The main result is that in cases (i) and (ii) cellular structure emerges, for (ii) this happens after a longer transient, while (iii) gives a diffuse looking pattern, similar to former single slip plane simulations. In the course of the evolution of dislocation number and cell size they statistically well satisfy Holt's relation. The cell structure found appears to have a characteristic cell size, in contrast to fractal examples in the presence of mechanical strain. Despite the simplicity of our model, the results are consistent with the recently detected low-density dislocation patterns in melt-grown, non-post-deformed crystals.

Original languageEnglish
Pages (from-to)22-28
Number of pages7
JournalComputational Materials Science
Volume38
Issue number1
DOIs
Publication statusPublished - Nov 2006

Fingerprint

Patterning
Dislocation
Burgers vector
Edge dislocations
Dislocations (crystals)
Fractals
Cell Size
Simulation
simulation
cells
Biased
Crystals
edge dislocations
Glide
Hexagonal Lattice
Coarse-graining
fractals
Pattern Formation
slip
Slip

Keywords

  • Cell structure formation
  • Dislocation patterning
  • Temperature and climb

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Dislocation patterning : The role of climb in meso-scale simulations. / Bakó, B.; Groma, I.; Györgyi, G.; Zimányi, G.

In: Computational Materials Science, Vol. 38, No. 1, 11.2006, p. 22-28.

Research output: Contribution to journalArticle

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