Small-scale plasticity: Insights into dislocation avalanche velocities

Robert Maaß, Peter M. Derlet, Julia R. Greer

Research output: Contribution to journalArticlepeer-review

Abstract

We report direct measurements of displacement jump velocities in deforming nano- and microcrystals. These velocities exhibit large scatter and no correlation with plastic strain, crystal size or applied stress. Statistical analysis for the displacement jump velocities shows a cubic power-law decay, with a shoulder at low velocities. Our results indicate that the collective motion of dislocations in the deforming crystals is dominated by statistical fluctuations within the internal stresses, rather than by a mobility law that depends on the externally applied stress.

Original languageEnglish (US)
Pages (from-to)586-589
Number of pages4
JournalScripta Materialia
Volume69
Issue number8
DOIs
StatePublished - Oct 1 2013
Externally publishedYes

Keywords

  • Dislocations
  • Micromechanics
  • Plasticity
  • Size effect

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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