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ZHAO Limin, LIU Liming, XU Rongzheng, ZHANG Zhaodong. Diffusion bonding of Mg/Al alloy with Zn interlayer metal[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2007, (10): 9-12.
Citation: ZHAO Limin, LIU Liming, XU Rongzheng, ZHANG Zhaodong. Diffusion bonding of Mg/Al alloy with Zn interlayer metal[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2007, (10): 9-12.

Diffusion bonding of Mg/Al alloy with Zn interlayer metal

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  • Received Date: December 10, 2006
  • The characteristics of microstructure and mechanical properties of the Mg/Al alloy joint by diffusion bonding with a Zn interlayer were studied by means of metalloscopy, X-ray diffraction, electron probe microanalysis and mechanical property test.Investigations showed that the Mg/Al alloy joint by diffusion bonding with Zn interlayer consists of a multilayer sandwich structure, including the transition zone of Zn-Al, the residual Zn interlayer, as well as the transition zone of Zn-Mg.The transition zone of Zn-Al is composed mainly of a solid solution structure, while the Zn-Mg transition zone has a relative larger dimension after a rapid eutectic reaction.The addition of zinc interlayer inhibits the inter-diffusion of Mg and Al alloy efficiently.The Zn-Mg transition zone constitutes the main part of the joint and consists of Mg and the new phases formed are Mg2Zn11 and MgZn2 intermetallic compound.According to the phase constitution analyses executed on each side of the fracture face, it was deduced that the fracture of Mg/Al alloy joint located around the interface of Zn-Mg transition zone.The average shear strength of Mg/Al alloy joints diffusion bonded with Zn interlayer reaches 70 MPa and exceeds that of the joints bonded without Zn interlayer enormously.
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