Deformation criterion for face-centered-cubic metal nanowires

Hong Kyu Kim, Sung Hoon Kim, Jae Pyoung Ahn, Jae-chul Lee

Research output: Contribution to journalArticle

Abstract

Much of our understanding of the tendency for deformation by dislocation slip (DS) versus deformation twinning (DT) in bulk metals relies on the magnitude of the stacking fault energy (SFE). However, the criterion based only on SFE is insufficient for evaluating the deformation behavior of nanowires (NWs) and possibly nano-grained crystalline metals. Here, by employing fault energy theories and dislocation theory, we have developed a parameter that enables the quantitative analysis of the relative tendency for DS and DT in Al NWs. In situ TEM tensile tests and atomic simulations of Al NWs showed that the competition between DS and DT is sensitive to the misfit energy, crystal size, and loading direction. Additional studies were conducted on Au and Pt NWs to determine the applicability of the proposed theory to other crystals. The theory produces self-consistent results even for metals with different SFE values.

Original languageEnglish
Pages (from-to)431-437
Number of pages7
JournalMaterials Science and Engineering A
Volume736
DOIs
Publication statusPublished - 2018 Oct 24

Keywords

  • Aluminum
  • Deformation twinning
  • fcc metals
  • In situ TEM
  • Simulations

ASJC Scopus subject areas

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

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