Heterogeneous plastic deformation and Bauschinger effect in ultrafine-grained metals: Atomistic simulations

Tomohito Tsuru, Yoshiteru Aoyagi, Yoshiyuki Kaji, Tomotsugu Shimokawa

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

The effect of the dislocation density on yield strength and subsequent plastic deformation of ultrafine-grained metals was investigated in large-scale atomistic simulations. Polycrystalline models were constructed and uniaxial tension and compression were applied to elucidate the heterogeneous plastic deformation and the Bauschinger effect. The initial yield becomes heterogeneous as the dislocation density decreases owing to a wide range of Schmid factors of activated slip systems in each grain. A different mechanism of the Bauschinger effect was proposed, where the Bauschinger effect of ultrafine-grained metals is caused by the change in dislocation density in the process of forward and backward loadings.

Original languageEnglish
Article number035010
JournalModelling and Simulation in Materials Science and Engineering
Volume24
Issue number3
DOIs
Publication statusPublished - 2016 Feb 22

Keywords

  • Bauschinger effect
  • atomistic simulations
  • dislocation density
  • ultrafine-grained metals
  • yield phenomena

ASJC Scopus subject areas

  • Modelling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Computer Science Applications

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