Change of microstructure and cyclic deformation behavior along the thickness in a friction-stir-welded aluminum alloy

The microstructure and cyclic deformation behavior of three slices of a thick plate of friction-stir-welded Al–Cu alloy were investigated. Friction stir welding resulted in a composite-like nugget zone consisting of fine particles uniformly dispersed in the recrystallized fine-grained matrix. The to...

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Bibliographic Details
Published inScripta materialia Vol. 66; no. 1; pp. 5 - 8
Main Authors Xu, W.F., Liu, J.H., Chen, D.L., Luan, G.H., Yao, J.S.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.01.2012
Subjects
Alloy plating
Aluminum alloy
Aluminum base alloys
Deformation
Dispersions
Fatigue failure
Friction stir welding
Low-cycle fatigue
Microstructure
Particulate composites
Striation
Microstructure
Friction stir welding
Low-cycle fatigue
Aluminum alloy
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Summary:The microstructure and cyclic deformation behavior of three slices of a thick plate of friction-stir-welded Al–Cu alloy were investigated. Friction stir welding resulted in a composite-like nugget zone consisting of fine particles uniformly dispersed in the recrystallized fine-grained matrix. The top slice had larger grains, smaller particles, higher hardness, stronger cyclic hardening, higher hysteresis energy and lower fatigue life than the bottom slice. Fatigue cracks initiated from near-surface particles in the low-hardness zone, and propagated via striation formation mechanisms along with particle cracking.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2011.08.021