Surface crack nucleation and propagation in electrodeposited nanocrystalline Ni-P alloy during high cycle fatigue

The morphology of specimen surface after fatigue fracture was evaluated in connection with grain orientation distribution and grain boundary microstructure to reveal a mechanism of fatigue fracture in nanocrystalline materials. The electrodeposited and sharply {001} textured Ni -2.0 mass% P alloy wi...

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Bibliographic Details
Published in:Journal of physics. Conference series 2010-07, Vol.240 (1), p.012053
Main Authors: Kobayashi, Shigeaki, Kamata, Akiyuki, Watanabe, Tadao
Format: Article
Language:English
Subjects:
Crack initiation
Crack propagation
Ductile fracture
Ductile-brittle transition
Fatigue failure
Fatigue limit
Fracture mechanics
Grain boundaries
Grain orientation
Grain size
High cycle fatigue
Metal fatigue
Morphology
Nanocrystals
Nickel base alloys
Nucleation
Physics
Polycrystals
Surface cracks
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Summary:The morphology of specimen surface after fatigue fracture was evaluated in connection with grain orientation distribution and grain boundary microstructure to reveal a mechanism of fatigue fracture in nanocrystalline materials. The electrodeposited and sharply {001} textured Ni -2.0 mass% P alloy with the average grain size of ca. 45 nm and high fractions of low-angle and Σ3 boundaries showed 2 times higher fatigue limit than electrodeposited microcrystalline Ni polycrystal. The surface features of fatigued specimen were classified into two different types of morphologies characterized as brittle fracture at the central area and as ductile fracture at the surrounding area.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/240/1/012053