Joining of magnesium and aluminum alloys via ultrasonic assisted friction stir welding at low temperature

Intermetallic compounds (IMCs) formed in the stir zone (SZ) of dissimilar friction stir welded aluminum/magnesium (Al/Mg) joint always deteriorate tensile properties. Joining of 6061-T6 Al and AZ31B Mg alloys via ultrasonic assisted friction stir welding (UaFSW) at low temperature was performed to r...

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Bibliographic Details
Published in:International journal of advanced manufacturing technology 2018-08, Vol.97 (9-12), p.4127-4136
Main Authors: Liu, Zhenlei, Ji, Shude, Meng, Xiangchen
Format: Article
Language:English
Subjects:
Aluminum
Aluminum base alloys
CAE) and Design
Computer-Aided Engineering (CAD
Deformation mechanisms
Dissimilar material joining
Dissimilar materials
Elongation
Engineering
Feasibility studies
Friction stir welding
Industrial and Production Engineering
Intermetallic compounds
Low temperature
Magnesium base alloys
Mechanical Engineering
Media Management
Original Article
Plastic deformation
Rotation
Tensile properties
Tensile strength
Welded joints
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Summary:Intermetallic compounds (IMCs) formed in the stir zone (SZ) of dissimilar friction stir welded aluminum/magnesium (Al/Mg) joint always deteriorate tensile properties. Joining of 6061-T6 Al and AZ31B Mg alloys via ultrasonic assisted friction stir welding (UaFSW) at low temperature was performed to reduce the disadvantages caused by IMCs. A sound Al/Mg joint with smooth surface was obtained based on the stationary shoulder at a high welding speed of 80 mm/min, rotational velocity of 1000 rpm, and ultrasonic power of 1400 W due to the improvement of material flow caused by ultrasonic, indicating the success of low-temperature welding. Meanwhile, joining interface, characterized by the IMCs, was attributed to inter diffusion caused by severe plastic deformation from ultrasonic and friction stirring. The tensile strength and elongation of the Al/Mg joint reached 134 MPa and 1.5%, respectively. The IMCs containing Al 2 Mg 3 formed in the SZ was the main reason of tensile fracture, and then resulted in cleavage fracture. The present study suggests that UaFSW has feasible and potential to join Al/Mg alloys at low temperature, which provides a significant reference for welding joint of dissimilar materials with the IMCs.
ISSN:0268-3768
1433-3015
DOI:10.1007/s00170-018-2255-8