Effect of hydrogen on dislocation structures around a mixed-mode fatigue crack tip in a single-crystalline iron-silicon alloy

Yoshimasa Takahashi, Junji Sakamoto, Masaki Tanaka, Kenji Higashida, Hiroshi Noguchi

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The effect of hydrogen on dislocation structures around a mixed-mode fatigue crack tip in a single-crystalline iron-silicon alloy was investigated by cross-sectional electron backscatter diffraction and high-voltage electron microscopy. In contrast to the previously reported results in an inert environment, no dislocation cells were formed around the crack tip in a hydrogen environment. The microscopic features around the crack tip suggest that hydrogen promotes a mode I-type crack growth mechanism, which reasonably explains the observed macroscopic crack growth property.

Original languageEnglish
Pages (from-to)721-724
Number of pages4
JournalScripta Materialia
Volume64
Issue number8
DOIs
Publication statusPublished - Apr 1 2011
Externally publishedYes

Keywords

  • Crack tip
  • EBSD
  • Fatigue
  • Hydrogen
  • TEM

ASJC Scopus subject areas

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

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