Microstructure and properties of aluminum/copper resistance spot welding joint with FeCrNiAlCu as intermediate layer
Using FeCrNiAlCu high entropy alloy powder as the intermediate layer,resistance spot welding was carried out on 2A16 aluminum alloy/T2 red copper.The effect of high entropy alloy powder on microstructure and mechanical properties of the joint was studied.The results show that there is an element mutual diffusion phenomenon between high entropy alloy powder and liquid aluminum alloy,and the Al-rich solution transition layer is formed.There are two layers of phase structure at the copper side interface,which are Al-rich solution layer and the IMC(Intermetallic compound)layer composed of Al2Cu compound.Some solution particles form mechanical occlusion with the base metal.When the welding current is 20-32 kA,the tensile strength of the joint first increases and then decreases with the increase of welding current.When the current is 25 kA,the tensile strength of the joint is the highest,reaching 1.64 kN,which is 30%higher than that of the joint without an intermediate layer.The fracture of the joint occurs at the copper side interface.
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