Journal
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
Volume 23, Issue 2, Pages 164-171Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/13621718.2017.1354545
Keywords
Al and Mg; Zn interlayer; welding; intermetallic; mechanical property
Funding
- Operation Expenses for Universities' Basic Scientific Research of Gansu Province [01_0071]
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The interfacial structure and mechanical properties of Al/Mg joints with and without Zn interlayer by friction stir-induced brazing bond have been investigated. The results revealed that the formation of brittle Al-Mg intermetallics could be effectively suppressed by the addition of Zn interlayer and using appropriate welding parameters, which were replaced by (Mg)+Mg-Zn and Al-Mg-Zn intermetallic. When rotation speed was further increased, Al-Mg intermetallics were formed again at the interface. The shear strength of Al/Mg joints with Zn interlayer was improved by up to similar to 25% in comparison with those of the joints without Zn interlayer. A mixture of ductility and cleavage fracture occurred on fracture surfaces of Zn-added joints which was different from the cleavage fracture feature of the direct joints.
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