Deformation-twin-induced grain boundary failure

Yongfeng Zhang, Paul C. Millett, Michael Tonks, Bulent Biner

Research output: Contribution to journalArticle

30 Scopus citations

Abstract

This work presents a mechanism of deformation-twin-induced grain boundary failure, and demonstrates the mechanism using molecular dynamics simulations. Deformation twinning is observed as the dominant mechanism during tensile deformation of 〈1 1 0〉 columnar nanocrystalline body-centered cubic Mo. As a twin approaches a grain boundary, local stress concentration develops due to the incompatible plastic deformations in the two neighboring grains. The magnitude of the stress concentration increases as the twin widens, leading to grain boundary cracking by nucleation and coalescence of microcracks/voids.

Original languageEnglish (US)
Pages (from-to)117-120
Number of pages4
JournalScripta Materialia
Volume66
Issue number2
DOIs
StatePublished - Jan 1 2012

All Science Journal Classification (ASJC) codes

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

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    Zhang, Y., Millett, P. C., Tonks, M., & Biner, B. (2012). Deformation-twin-induced grain boundary failure. Scripta Materialia, 66(2), 117-120. https://doi.org/10.1016/j.scriptamat.2011.10.021