Correlation between microstructure and microhardness in a friction stir welded 2024 aluminium alloy

A 2024-T351 aluminium alloy has been friction stir welded and the microstructures investigated. An inner HAZ hardness minimum was a result of an overaged S phase, whereas an outer minimum was believed to be due to precipitate dissolution. An interjacent HAZ maximum was attributable to the presence o...

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Bibliographic Details
Published in:Scripta materialia 2005-04, Vol.52 (8), p.693-697
Main Authors: Jones, M.J., Heurtier, P., Desrayaud, C., Montheillet, F., Allehaux, D., Driver, J.H.
Format: Article
Language:English
Subjects:
Aluminium alloys
Applied sciences
Cross-disciplinary physics: materials science
rheology
Engineering Sciences
Exact sciences and technology
Friction stir welding
Hardness
Joining, thermal cutting: metallurgical aspects
Materials
Materials science
Metals. Metallurgy
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Precipitation
Solidification
TEM
Welding
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Summary:A 2024-T351 aluminium alloy has been friction stir welded and the microstructures investigated. An inner HAZ hardness minimum was a result of an overaged S phase, whereas an outer minimum was believed to be due to precipitate dissolution. An interjacent HAZ maximum was attributable to the presence of very fine S phase precipitates. The nugget zone contained ∼4 μm grains and complex dislocation structures.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2004.12.027