Characterization of 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

doi:10.1016/j.scriptamat.2010.09.033

Characterization of 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 journal › Article › peer-review

5 Citations (Scopus)

Abstract

Dislocation structures around a mixed-mode fatigue crack tip introduced into a single-crystalline iron-silicon alloy is characterized by cross-sectional electron backscatter diffraction and high-voltage electron microscopy. The results show that the crack growth is preceded by the formation of a cell band and the crack grows along cell boundaries. Crack growth rate and width of the cell band are constant despite the monotonic increase in stress intensity, which is anomalous in terms of the conventional fracture mechanics concept.

Original language	English
Pages (from-to)	157-160
Number of pages	4
Journal	Scripta Materialia
Volume	64
Issue number	2
DOIs	https://doi.org/10.1016/j.scriptamat.2010.09.033
Publication status	Published - Jan 2011
Externally published	Yes

Keywords

Crack tip
Dislocation structure
EBSD
Fatigue
TEM

ASJC Scopus subject areas

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

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10.1016/j.scriptamat.2010.09.033

Cite this

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title = "Characterization of dislocation structures around a mixed-mode fatigue crack tip in a single-crystalline iron-silicon alloy",

abstract = "Dislocation structures around a mixed-mode fatigue crack tip introduced into a single-crystalline iron-silicon alloy is characterized by cross-sectional electron backscatter diffraction and high-voltage electron microscopy. The results show that the crack growth is preceded by the formation of a cell band and the crack grows along cell boundaries. Crack growth rate and width of the cell band are constant despite the monotonic increase in stress intensity, which is anomalous in terms of the conventional fracture mechanics concept.",

keywords = "Crack tip, Dislocation structure, EBSD, Fatigue, TEM",

author = "Yoshimasa Takahashi and Junji Sakamoto and Masaki Tanaka and Kenji Higashida and Hiroshi Noguchi",

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doi = "10.1016/j.scriptamat.2010.09.033",

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volume = "64",

pages = "157--160",

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T1 - Characterization of dislocation structures around a mixed-mode fatigue crack tip in a single-crystalline iron-silicon alloy

AU - Takahashi, Yoshimasa

AU - Sakamoto, Junji

AU - Tanaka, Masaki

AU - Higashida, Kenji

AU - Noguchi, Hiroshi

N1 - Funding Information: This study was conducted as a part of ‘‘Fundamental Research Project on Advanced Hydrogen Science’’ funded by New Energy and Industrial Technology Development Organization (NEDO). The authors are indebted to Mr. T. Daio at the Research Laboratory for HVEM (Kyushu University) for his help with the HVEM.

PY - 2011/1

Y1 - 2011/1

N2 - Dislocation structures around a mixed-mode fatigue crack tip introduced into a single-crystalline iron-silicon alloy is characterized by cross-sectional electron backscatter diffraction and high-voltage electron microscopy. The results show that the crack growth is preceded by the formation of a cell band and the crack grows along cell boundaries. Crack growth rate and width of the cell band are constant despite the monotonic increase in stress intensity, which is anomalous in terms of the conventional fracture mechanics concept.

AB - Dislocation structures around a mixed-mode fatigue crack tip introduced into a single-crystalline iron-silicon alloy is characterized by cross-sectional electron backscatter diffraction and high-voltage electron microscopy. The results show that the crack growth is preceded by the formation of a cell band and the crack grows along cell boundaries. Crack growth rate and width of the cell band are constant despite the monotonic increase in stress intensity, which is anomalous in terms of the conventional fracture mechanics concept.

KW - Crack tip

KW - Dislocation structure

KW - EBSD

KW - Fatigue

KW - TEM

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

Abstract

Keywords

ASJC Scopus subject areas

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