Quenched pinning and collective dislocation dynamics

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date

2015

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Department of Applied Physics

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Mcode

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Language

en

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Scientific Reports, Volume 5, pp. 1-8

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.

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Keywords

avalanches, dislocations, plastic deformation

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DOI

10.1038/srep10580

Citation

Ovaska, M, Laurson, L & Alava, M J 2015, 'Quenched pinning and collective dislocation dynamics', Scientific Reports, vol. 5, 10580, pp. 1-8. https://doi.org/10.1038/srep10580

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https://urn.fi/URN:NBN:fi:aalto-202510087935

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[article-cris] Perustieteiden korkeakoulu / SCI