Refill Friction Stir Spot Welding Dissimilar Al/Mg Alloys

Journal Article · Tue Oct 15 04:00:00 EDT 2019 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-019-04359-7· OSTI ID:22970415

Chai, Peng ^[1]; Hu, Wei; Ji, Shude; Ai, XinXin; Lv, Zan; Song, Qi ^[2]

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1. Beihang University, School of Mechanical Engineering and Automation (China)
2. Shenyang Aerospace University, School of Aerospace Engineering (China)

Dissimilar Al/Mg alloys were joined by refill friction stir spot welding (RFSSW) in this work. The effect of sleeve plunge depth on microstructure and mechanical properties of the joints was studied. The results showed that sound joint can be obtained at sleeve plunge depth of 2.4 mm. Intermetallic compounds (IMCs) layer, formed by the liquid eutectic phase, were observed at both the sleeve-affected zone and joint center. The IMC at the pin-affected zone was thicker than that at the sleeve-affected zone because of its flow characteristic. Less liquid eutectic phase formed during RFSSW when joint using Mg as the upper sheet because the oxide layer on the Al sheet was hard to break, resulting to thinner IMC layer. The maximum load of 3.6 kN was obtained at 2.6 mm when the Al alloys served as the upper sheet, and the maximum failure of 3.6 kN was also obtained at 2.4 mm when the Mg alloys served as the upper sheet. The RFSSW joint presented shear fracture mode. The XRD patterns showed that the IMC of Al{sub 3}Mg{sub 2} and Al{sub 12}Mg{sub 17} formed inside the joint.

• OSTI ID: 22970415
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 10 Vol. 28; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
EUTECTICS
FRICTION
INTERMETALLIC COMPOUNDS
JOINTS
LIQUIDS
NANOSTRUCTURES
OXIDES
SHEAR PROPERTIES
SHEETS
WELDING
X-RAY DIFFRACTION
ZONES