Influence of competition between intragranular dislocation nucleation and intergranular slip transfer on mechanical properties of ultrafine-grained metals

Tomohito Tsuru, Yoshiteru Aoyagi, Yoshiyuki Kaji, Tomotsugu Shimokawa

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Huge-scale atomistic simulations of shear deformation tests to the aluminum polycrystalline thin film containing the FrankRead source are performed to elucidate the relationship between the inter- and intragranular plastic deformation processes and the mechanical properties of ultrafine-grained metals. Two-types of polycrystalline models, which consist of several grain boundaries reproducing easy and hard slip transfer, respectively, are prepared to investigate the effect of grain boundary on flow stress. While the first plastic deformation occurs by the dislocation bow-out motion within the grain region for both models, the subsequent plastic deformation is strongly influenced by the resistance of the slip transfer by dislocation transmission through grain boundaries. The influence of the competition between the intragranular dislocation nucleation and intergranular slip transfer on the material strength is considered. The nanostructured material's strength depending on local defect structures associated with grain size and dislocation source length is assessed quantitatively.

Original languageEnglish
Pages (from-to)1580-1586
Number of pages7
JournalMaterials Transactions
Volume54
Issue number9
DOIs
Publication statusPublished - 2013 Sep 4

Keywords

  • Atomistic simulation
  • Bulk nanostructured metals
  • Dislocation source
  • Grain boundary
  • Intergranular slip transfer
  • Intragranular dislocation nucleation
  • Mechanical property
  • Ultra-fine grained metals

ASJC Scopus subject areas

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

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