Interfacial Structure and Mechanical Properties of Mg-Al Diffusion Bonded Joint with Ni Foil Interlayer
ZHANG Jian1,2,3, LUO Guo-qiang2, SHEN Qiang2, HUANG Zhi-jun1
1. Research and Development Center of Wuhan Iron and Steel (Group) Corporation, Wuhan 430080, China;
2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;
3. College of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
Abstract：Magnesium and aluminum alloys were welded by diffusion bonding using Ni foil as interlayer. Scanning acoustic microscopy (SAM), electronic probe microanalysis (EPMA), scanning electron microscopy (SEM) and universal testing machine were used to characterize the interfacial structure and mechanical properties of the joints. The results show that Mg and Al are bonded successfully by diffusion bonding using Ni interlayer and the Mg-Al inter-diffusion is inhibited. There is no Mg-Al intermetallic compound formed. The maximum shear strength of 20.5MPa is obtained at 440℃ for 90min. Mg/Ni/Al joints are formed by the inter-diffusion of Al, Ni and Mg, Ni. Al-Ni and Mg-Ni diffusion zone formed at the joint interface. Al3Ni2 and Al3Ni are formed at the Al-Ni diffusion zone, and Mg2Ni is formed at the Mg-Ni diffusion zone. The thickness of diffusion zone increases with the increase of welding temperature.
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2015, Vol. 43 
