Effect of Tool Offset and Tool Rotational Speed on Enhancing Mechanical Property of Al/Mg Dissimilar FSW Joints
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WITH their high specific strength, aluminum and magnesium alloys are becoming more and more important as structural materials for the transportation industry which strives to reduce weight. Joining of Al alloys and Mg alloys together is inevitable to combine their individual advantages for increased design flexibility. Therefore, Al/Mg dissimilar joining becomes a key technological problem drawing a lot of research interest recently.[1–10] The conventional fusion welding technique cannot solve this problem due to its high heat input and the formation of massive brittle intermetallic compounds (IMCs) and microdefects such as cracks and voids which will deteriorate the mechanical properties of the joints. As a solid-state joining technique with low and controlZHIYUAN LIANG, formerly Undergraduate Student with the School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, P.R. China, is now Graduate Student with the Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong. KE CHEN, Lecturer, XIAONA WANG, Graduate Student, LANTING ZHANG and AIDANG SHAN, Professors, are with the School of Materials Science and Engineering, Shanghai Jiao Tong University. Contact e-mail: [email protected] JUNSHAN YAO, Vice General Engineer, is with the Special Welding Technology Center, Shanghai Aerospace Equipments Manufacturer, Shanghai 200245, P.R. China. QI YANG, Chief Researcher, is with the Research Institute, Baoshan Iron & Steel Co., Ltd, Shanghai 201900, P.R. China. Manuscript submitted June 29, 2012. Article published online March 20, 2013 METALLURGICAL AND MATERIALS TRANSACTIONS A
lable heat input, friction stir welding (FSW) shows a great potential in producing sound joints between dissimilar alloys. Successful joints between dissimilar Al alloys,[11–24] Al/Cu,[25–29] Al/Fe,[30–35] Al/Ti,[36–39] and Fe/Ni[40] have been reported. FSW has been successfully applied in joining Al alloys to Mg alloys as well.[2–4,6–10,41–47] However, previously reported Al/Mg dissimilar FSW joints generally have low ductility (
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