Statistics of dislocation slip avalanches in nanosized single crystals show tuned critical behavior predicted by a simple mean field model

Nir Friedman, Andrew T. Jennings, Georgios Tsekenis, Ju Young Kim, Molei Tao, Jonathan T. Uhl, Julia R. Greer, Karin A. Dahmen

Research output: Contribution to journalArticlepeer-review

Abstract

We show that slowly sheared metallic nanocrystals deform via discrete strain bursts (slips), whose size distributions follow power laws with stress-dependent cutoffs. We show for the first time that plasticity reflects tuned criticality, by collapsing the stress-dependent slip-size distributions onto a predicted scaling function. Both power-law exponents and scaling function agree with mean-field theory predictions. Our study of 7 materials and 2 crystal structures, at various deformation rates, stresses, and crystal sizes down to 75nm, attests to the universal characteristics of plasticity.

Original languageEnglish (US)
Article number095507
JournalPhysical review letters
Volume109
Issue number9
DOIs
StatePublished - Aug 30 2012

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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