Molecular dynamics simulations of compression–tension asymmetry in plasticity of Fe nanopillars

Con J. Healy, Graeme J. Ackland

Research output: Contribution to journalArticlepeer-review

Abstract

Tension–compression asymmetry is a notable feature of plasticity in body-centred cubic (bcc) single crystals. Recent experiments reveal striking differences in the plasticity of bcc nanopillars for tension and compression. Here we present results from molecular dynamics simulations of nanopillars of bcc Fe in tension and compression. We find that a totally different deformation mechanism applies in each case: dislocation glide in compression and twinning in tension. This difference explains experimentally observed asymmetry in the nanopillar morphology.

Original languageEnglish
Pages (from-to)105-112
Number of pages8
JournalActa Materialia
Volume70
Early online date18 Mar 2014
DOIs
Publication statusPublished - 15 May 2014

Keywords

  • Nanopillar
  • Plasticity
  • Molecular dynamics
  • Dislocations
  • Twinning
  • DEFORMATION MECHANISMS
  • SINGLE-CRYSTALS
  • MOLYBDENUM
  • IRON
  • METALS
  • ORIENTATION
  • TEMPERATURE
  • TRANSITION
  • TUNGSTEN

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