Dislocation glasses

Aging during relaxation and coarsening

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

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

The dynamics of dislocations is reported to exhibit a range of glassy properties. We study numerically various versions of 2D edge dislocation systems, in the absence of externally applied stress. Two types of glassy behavior are identified (i) dislocations gliding along randomly placed, but fixed, axes exhibit relaxation to their spatially disordered stable state; (ii) if both climb and annihilation are allowed, irregular cellular structures can form on a growing length scale before all dislocations annihilate. In all cases both the correlation function and the diffusion coefficient are found to exhibit aging. Relaxation in case (i) is a slow power law, furthermore, in the transient process (ii) the dynamical exponent z 6, i.e., the cellular structure coarsens relatively slowly.

Original languageEnglish
Article number075701
JournalPhysical Review Letters
Volume98
Issue number7
DOIs
Publication statusPublished - Feb 14 2007

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glass
gliding
edge dislocations
diffusion coefficient
exponents

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Dislocation glasses : Aging during relaxation and coarsening. / Bakó, B.; Groma, I.; Györgyi, G.; Zimányi, G. T.

In: Physical Review Letters, Vol. 98, No. 7, 075701, 14.02.2007.

Research output: Contribution to journalArticle

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