Interfacial Characterization of Dissimilar Joints Between Al/Mg/Al-Trilayered Clad Sheet to High-Strength Low-Alloy Steel

Magnesium (Mg) alloys are increasingly used in the automotive and aerospace sectors to reduce vehicle weight. Al/Mg/Al tri-layered clad sheets are deemed as a promising alternative to improve the corrosion resistance and formability of Mg alloys. The structural application of Al/Mg/Al tri-layered cl...

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Bibliographic Details
Published in:JOM (1989) 2015-07, Vol.67 (7), p.1468-1477
Main Authors: Macwan, A., Jiang, X. Q., Chen, D. L.
Format: Article
Language:English
Subjects:
Aircraft
Alloys
Aluminum alloys
Automobiles
Chemistry/Food Science
Corrosion resistance
Earth Sciences
Energy
Energy consumption
Engineering
Environment
Intermetallic compounds
Physics
Steel
Studies
Weights & measures
Welding
X-rays
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Summary:Magnesium (Mg) alloys are increasingly used in the automotive and aerospace sectors to reduce vehicle weight. Al/Mg/Al tri-layered clad sheets are deemed as a promising alternative to improve the corrosion resistance and formability of Mg alloys. The structural application of Al/Mg/Al tri-layered clad sheets inevitably involves welding and joining in the multi-material vehicle body manufacturing. This study aimed to characterize the bonding interface microstructure of the Al/Mg/Al-clad sheet to high-strength low-alloy steel with and without Zn coating using ultrasonic spot welding at different levels of welding energy. It was observed that the presence of Zn coating improved the bonding at the interface due to the formation of Al-Zn eutectic structure via enhanced diffusion. At a higher level of welding energy, characteristic flow patterns of Zn into Al-clad layer were observed with an extensive penetration mainly along some high angle grain boundaries. The dissimilar joints without Zn coating made at a high welding energy of 800 J failed partially from the Al/Fe weld interface and partially from the Al/Mg clad interface, while the joints with Zn coating failed from the Al/Mg clad interface due to the presence of brittle Al 12 Mg 17 phase.
ISSN:1047-4838
1543-1851
DOI:10.1007/s11837-015-1466-9