Significantly enhanced crack blunting by nanograin rotation in nanocrystalline materials

Jianjun Li, Shaohua Chen, George J. Weng

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Experiments have shown that stress-driven grain growth is closely related to the enhanced crack growth resistance and the exceptional tensile ductility as observed in several nano-metals. However, the quantitative correlation remains unsolved. Here we developed a theoretical model to investigate the effect of nanograin rotation, one of the main modes of stress-driven grain growth, on dislocation emission from the tip of a semi-infinite crack in a nanograined solid. Our findings show that the nanograin rotation can significantly enhance the capability of the crack to emit dislocations, thus leading to strong crack blunting in nanomaterials.

Original languageEnglish (US)
Pages (from-to)19-23
Number of pages5
JournalScripta Materialia
Volume151
DOIs
StatePublished - Jul 1 2018

All Science Journal Classification (ASJC) codes

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

Keywords

  • Crack blunting
  • Dislocation emission
  • Nanocrystalline materials
  • Nanograin rotation
  • Toughening

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