EBSD analysis of fatigue crack initiation behavior in coarse-grained AZ31 magnesium alloy

•Fatigue crack initiation mechanism in coarse-grained Mg alloy.•Crystallographic analyses of fatigue crack initiation using EBSD.•Schmid factors calculation of activated slips and twins.•Slip and twin lines analyses based on Euler angles.•Proposal of criteria for both inter- and intergranular fatigu...

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Bibliographic Details
Published in:International journal of fatigue 2016-03, Vol.84, p.1-8
Main Authors: Uematsu, Yoshihiko, Kakiuchi, Toshifumi, Tamada, Kazuhiro, Kamiya, Yoshifumi
Format: Article
Language:English
Subjects:
Bending fatigue
Close packed lattices
Crack initiation
Crystal structure
Crystallographic orientation
EBSD analysis
Electron back scatter diffraction
Fatigue crack initiation
Fatigue failure
Fatigue tests
Magnesium alloy
Magnesium base alloys
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Summary:•Fatigue crack initiation mechanism in coarse-grained Mg alloy.•Crystallographic analyses of fatigue crack initiation using EBSD.•Schmid factors calculation of activated slips and twins.•Slip and twin lines analyses based on Euler angles.•Proposal of criteria for both inter- and intergranular fatigue crack initiation. Plane bending fatigue tests had been conducted to investigate fatigue crack initiation mechanism in coarse-grained magnesium alloy, AZ31, with hexagonal close-packed (hcp) crystallographic structure. The initial crystallographic structure was analyzed by an electron backscatter diffraction (EBSD) method. Subsequently, a fatigue test was periodically terminated and time-series EBSD analyses were performed. Basal slip and primary twin operated predominantly. In a twin band, secondary twin operated, and resulted in the fatigue crack initiation. The crack initiation was strongly affected by Schmid factors in the grains and twin bands.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2015.11.010