Fatigue strength plateau induced by microstructure inhomogeneity

Fatigue damage localization is a critical problem which greatly impacts on the fatigue strength improvement. As a main cause of fatigue damage concentration, the microstructure inhomogeneity of cold-rolled and annealed Cu-5at%Al alloy has been paid much attention in this study. A notable plateau wit...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2017-08, Vol.702, p.259-264
Main Authors: Liu, R., Tian, Y.Z., Zhang, Z.J., Zhang, P., Zhang, Z.F.
Format: Article
Language:English
Subjects:
Alloys
Aluminum base alloys
Annealing
Cold rolling
Copper base alloys
Crack propagation
Cu-Al alloy
Damage localization
Fatigue damage localization
Fatigue failure
Fatigue strength
Grain size
High-cycle fatigue (HCF)
Impact damage
Inhomogeneity
Materials fatigue
Microstructure
Microstructure homogeneity
Recrystallization
Studies
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Summary:Fatigue damage localization is a critical problem which greatly impacts on the fatigue strength improvement. As a main cause of fatigue damage concentration, the microstructure inhomogeneity of cold-rolled and annealed Cu-5at%Al alloy has been paid much attention in this study. A notable plateau with constant fatigue strength is discovered in the region of partially recrystallized microstructures which share similar maximum grain size. The existence of such “fatigue strength plateau” suggests that in some specific cases, fatigue strength would vary with neither the tensile strength nor the average grain size, since the fatigue resistance of the damage localized regions remains unchanged. [Display omitted]
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2017.07.026