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

10 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

Fingerprint

Silicon alloys
silicon alloys
iron alloys
Iron alloys
crack tips
Crack tips
Hydrogen
Crystalline materials
Crack propagation
hydrogen
cracks
Electron diffraction
Electron microscopy
high voltages
electron microscopy
Electric potential
cells
diffraction
Fatigue cracks
electrons

Keywords

  • Crack tip
  • EBSD
  • Fatigue
  • Hydrogen
  • TEM

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Effect of hydrogen on dislocation structures around a mixed-mode fatigue crack tip in a single-crystalline iron-silicon alloy. / Takahashi, Yoshimasa; Sakamoto, Junji; Tanaka, Masaki; Higashida, Kenji; Noguchi, Hiroshi.

In: Scripta Materialia, Vol. 64, No. 8, 01.04.2011, p. 721-724.

Research output: Contribution to journalArticle

Takahashi, Yoshimasa ; Sakamoto, Junji ; Tanaka, Masaki ; Higashida, Kenji ; Noguchi, Hiroshi. / Effect of hydrogen on dislocation structures around a mixed-mode fatigue crack tip in a single-crystalline iron-silicon alloy. In: Scripta Materialia. 2011 ; Vol. 64, No. 8. pp. 721-724.
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