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<p>The low-temperature diffusion bonding of AZ31 Mg alloy and 5083 Al alloy was successfully achieved by using the solid-immiscible Zn-Bi alloy as the interlayer with the trace Bi liquid phase formed on the bonding interface at a bonding temperature between the melting points of Zn and Bi. The microstructures and mechanical properties of the joints were investigated. The results show that the suitable Bi content of Zn-Bi alloys was 2 wt.%. The layer structure of the joints was Al(Zn)/Zn-2Bi/MgZn<sub>2</sub> and Al(Zn)/primary Al-Zn eutectoid (α + η)/Zn-2Bi/MgZn<sub>2</sub>/MgZn for the bonding time of 120&#xa0;min and 360&#xa0;min, respectively. The structure of the joint was further evolved to Al(Zn)/secondary Al-Zn eutectoid (α + η)/primary Al-Zn eutectoid (α + η)/Zn-2Bi/Mg<sub>2</sub>Zn<sub>11</sub>/MgZn<sub>2</sub>/Mg<sub>2</sub>Zn<sub>3</sub>/MgZn when the bonding time was extended to 480&#xa0;min. The joints at the bonding temperature of 335 °C for the different bonding times exhibited a consistent trend of microhardness variety. The maximum hardness value of the joint was 255 HV which located at the AZ31/Zn-2Bi interface while a maximum shear strength of 19.9&#xa0;MPa was achieved for the joint bonded at 335 °C for 360&#xa0;min. The fracture surface was located at 5083/Zn-2Bi interface, Al-Zn eutectoid layer and MgZn<sub>2</sub> layer for 120, 360 and 480&#xa0;min, respectively. The fracture mode of all joints was brittle fracture.</p>

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Microstructure and Mechanical Properties of Mg/Al Dissimilar Metal Diffusion Bonding Joints Using Zn-Bi Alloys as Interlayer

  • 期刊论文

  • 发表日期：

    2025年6月10日

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  • Tianbao Tan,
  • Gang Chen,
  • Baoshuan Liu,
  • Hong Wang,
  • Zijun Rong,
  • Houhong Pan

摘要

The low-temperature diffusion bonding of AZ31 Mg alloy and 5083 Al alloy was successfully achieved by using the solid-immiscible Zn-Bi alloy as the interlayer with the trace Bi liquid phase formed on the bonding interface at a bonding temperature between the melting points of Zn and Bi. The microstructures and mechanical properties of the joints were investigated. The results show that the suitable Bi content of Zn-Bi alloys was 2 wt.%. The layer structure of the joints was Al(Zn)/Zn-2Bi/MgZn2 and Al(Zn)/primary Al-Zn eutectoid (α + η)/Zn-2Bi/MgZn2/MgZn for the bonding time of 120 min and 360 min, respectively. The structure of the joint was further evolved to Al(Zn)/secondary Al-Zn eutectoid (α + η)/primary Al-Zn eutectoid (α + η)/Zn-2Bi/Mg2Zn11/MgZn2/Mg2Zn3/MgZn when the bonding time was extended to 480 min. The joints at the bonding temperature of 335 °C for the different bonding times exhibited a consistent trend of microhardness variety. The maximum hardness value of the joint was 255 HV which located at the AZ31/Zn-2Bi interface while a maximum shear strength of 19.9 MPa was achieved for the joint bonded at 335 °C for 360 min. The fracture surface was located at 5083/Zn-2Bi interface, Al-Zn eutectoid layer and MgZn2 layer for 120, 360 and 480 min, respectively. The fracture mode of all joints was brittle fracture.