Non-vacuum transient liquid phase diffusion bonding process for 5A06 aluminum allov rod
Non-vacuum transient liquid phase diffusion bonding of 5A06 aluminum alloy rods was carried out by using a self-made interlayer with a composition of Al-7Si-20Cu-3Mg-3Zn-1Ni-1Ga.Microstructure and mechanical properties of the joints under different welding processes were studied by means of scanning electron microscopy,X-ray diffraction,electron probe and universal tensile machine.The relationship between microstructure and fracture morphology was established,and the effects of different welding process parameters on the joint connection process were discussed.The results show that when the welding temperature is 550 ℃ and the holding time is 20 min,the mechanical properties of the joint are the best,with an average tensile strength of 201 MPa,which is about 72％ of the strength of the base metal.With the increase of welding temperature,the joint will be oxidized due to excessive welding temperature,and under the action of welding pressure,the joint will crack due to softening.With the increase of holding time,a small amount of block-like Al-Mg-Cu ternary eutectic phase and a small amount of SiO2 are formed at the center of the weld,the segregation of some SiO2 occurs between them,making it difficult to weld and resulting in the cracks in the weld,seriously affecting the joint performance.
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