Tensile deformation properties of single crystal copper with nanotwins

Kaiguo Chen, San-Qiang Shi, J. Lu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

6 Citations (Scopus)

Abstract

The tensile properties along the 〈111 direction of single crystalline copper with 90 nanotwins are investigated by molecular dynamics simulation. The following results are observed. First, twin boundaries do not serve as a dislocation source at the very beginning of plastic deformation; instead, dislocations nucleate inside the crystal between the twin boundaries. Second, twin boundaries provide obstacles to the motion of dislocations on the inclined glide plane, and allow dislocations to move through at high stress. When the spacing of the twin boundaries is greater than 10 nm, deformation twinning starts to form during plastic deformation. Third, the flow strength of single crystal copper with nanotwins increases as the twin spacing decreases, which resembles a Hall-Petch like relationship. The strengthening mechanism is explained by a simple dislocation model.
Original languageEnglish
Pages (from-to)269-276
Number of pages8
JournalComputational Materials Science
Volume83
DOIs
Publication statusPublished - 15 Feb 2014

Keywords

  • Copper
  • Molecular dynamics simulation
  • Nanotwins
  • Tensile property

ASJC Scopus subject areas

  • Computer Science(all)
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Computational Mathematics

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