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

Tomohito Tsuru, Yoshiteru Aoyagi, Tomotsugu Shimokawa

研究成果: Article査読

1 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)1476-1481
ページ数6
ジャーナルMaterials Transactions
57
9
DOI
出版ステータスPublished - 2016

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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