Towards the problem of forming full strength welded joints on aluminum alloy sheets. Part I: AA2024

This work shows the microstructural evolution of solid solution grains and secondary phase precipitates in the stirring zones of ultrasonic-assisted friction stir welding (UAFSW) and standard friction stir welding (FSW). As shown, fine spherical AlMgCu precipitates dominate in FSW stirring zone wher...

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Bibliographic Details
Main Authors: Fortuna, Sergey, Eliseev, Alexander, Kalashnikova, Tatiana, Kolubaev, Evgeny
Format: Conference Proceeding
Language:English
Subjects:
Aluminum alloys
Aluminum base alloys
Base metal
Chemical precipitation
Friction stir welding
Metal sheets
Platelets
Precipitates
Solid solutions
Stirring
Tensile stress
Welded joints
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Summary:This work shows the microstructural evolution of solid solution grains and secondary phase precipitates in the stirring zones of ultrasonic-assisted friction stir welding (UAFSW) and standard friction stir welding (FSW). As shown, fine spherical AlMgCu precipitates dominate in FSW stirring zone whereas nanosized Al2MgCu (S-phase) platelets ones are the main finding in UAFSW sample. The mechanical strength of AA2024 is provided by precipitation of coherent intermetallic S-phase particles. The dominating amount of S-phase precipitates in UAFSW sample provided the ultimate stress level close to that of the base metal, i.e. 402 MPa as compared to 302 MPa of FSW sample. These values constituted 93 and 85%, respectively, of the base metal strength.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4966351