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Journal of Materials Engineering and Performance
Published in: Journal of Materials Engineering and Performance 4/2018

28-03-2018

Microstructure and Mechanical Properties of Dissimilar Joints of Al-Mg2Si and 5052 Aluminum Alloy by Friction Stir Welding

Authors: B. W. Huang, Q. D. Qin, D. H. Zhang, Y. J. Wu, X. D. Su

Published in: Journal of Materials Engineering and Performance | Issue 4/2018

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Abstract

Al-Mg2Si alloy and 5052 Al alloy were welded successfully by friction stir welding (FSW) in this study. The results show that the alloy consists of three distinct zones after FSW: the base material zone (BMZ), the transitional zone, and the weld nugget (WN). The morphologies of the primary Mg2Si phases are identified as coarse equiaxed crystals for Al-Mg2Si alloys in the BMZ. The WN is a mixture of rich Al-Mg2Si and rich 5052 alloy, and a banded structure is formed in the zone. Interestingly, in the WN, the equiaxed crystals changed to polygonal particles with substantially reduced sizes in the rich Al-Mg2Si zone. However, in addition to the white rich Mg phase appearing in the rich 5052 zone near the interface, the 5052 alloy does not show obvious changes. The hardness gradually increases from the BMZ of the 5052 to the welded joint to the Al-Mg2Si BMZ. In addition, the ultimate tensile strength (UTS) of the welded joint is higher than that of the base material of the Al-Mg2Si, whereas it is lower than that of the 5052 base alloy. The results of the elongation are similar to the UTS results. The fracture mechanism is also investigated.
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Metadata
Title
Microstructure and Mechanical Properties of Dissimilar Joints of Al-Mg2Si and 5052 Aluminum Alloy by Friction Stir Welding
Authors
B. W. Huang
Q. D. Qin
D. H. Zhang
Y. J. Wu
X. D. Su
Publication date
28-03-2018
Publisher
Springer US
Published in
Journal of Materials Engineering and Performance / Issue 4/2018
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-018-3311-0

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