Atomic scale simulations of relationship between macroscopic mechanical properties and microscopic defect evolution in ultrafine-grained metals

Tomohito Tsuru, Yoshiteru Aoyagi, Tomotsugu Shimokawa

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The effects of grain size and intragranular dislocation on yield mechanism and subsequent plastic deformation in ultrane-grained (UFG) Al and Cu were investigated by large-scale atomic simulations. Polycrystalline atomic models with and without intragranular dislocation sources were used to elucidate the relationship between mechanical properties and defect texture. It is found that the intragranular dislocation plays a signicant role in both incipient yield and grain boundary mediated dislocation nucleation. In addition UFG Cu yields earlier than UFG Al because partial dislocations in Cu are more likely to activate from grain boundaries, where the partial dislocation leaves deformation twin and secondary dislocation tends to move on twin boundary accompanied by the shift of twin boundary plane.

Original languageEnglish
Pages (from-to)1476-1481
Number of pages6
JournalMaterials Transactions
Volume57
Issue number9
DOIs
Publication statusPublished - 2016 Jan 1

Keywords

  • Atomistic simulations
  • Grain size
  • Intragranular dislocation
  • Twin boundary
  • Ultrafine-grained metals

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Atomic scale simulations of relationship between macroscopic mechanical properties and microscopic defect evolution in ultrafine-grained metals'. Together they form a unique fingerprint.

  • Cite this