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Nature Research, Scientific Reports, 1(5), 2015

DOI: 10.1038/srep10580

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Quenched pinning and collective dislocation dynamics

Journal article published in 2014 by Markus Ovaska, Lasse Laurson ORCID, Mikko J. Alava
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Several experiments show that crystalline solids deform in a bursty and intermittent fashion. Power-law distributed strain bursts in compression experiments of micron-sized samples, and acoustic emission energies from larger-scale specimens, are the key signatures of the underlying critical-like collective dislocation dynamics - a phenomenon that has also been seen in discrete dislocation dynamics (DDD) simulations. Here we show, by performing large-scale two-dimensional DDD simulations, that the character of the dislocation avalanche dynamics changes upon addition of sufficiently strong randomly distributed quenched pinning centres, present e.g. in many alloys as immobile solute atoms. For intermediate pinning strength, our results adhere to the scaling picture of depinning transitions, in contrast to pure systems where dislocation jamming dominates the avalanche dynamics. Still stronger disorder quenches the critical behaviour entirely. ; Comment: 16 pages, 5 figures