Abstract：The experimental study on diffusion bonding of aluminium copper bimetal composite structure was conducted, and the influence of different welding process, materials combinations, and base metal status on weldability of aluminium alloy and copper was discussed, the joint microstructure was observed. The results show that the solid-state diffusion bonding is suitable for dissimilar materials bonding The Al-Cu intermetallic compound is formed in the joint zone, so the effective bond can be obtained. The factors such as material combinations, base metal status, and bonding parameters are all influent on diffusion bonding of aluminium alloy and copper. Ni coating on the copper surface can prevent the Al-Cu joint from formation of brittle phases, and because of interaction and inter-diffusion between Al and Ni elements, the joint property is improved.
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