With the rapid development of global science and technology, the performance of a single material has been unable to meet the needs of certain industries, and people have put forward more stringent requirements for the performance of materials. Copper-aluminum clad material not only has the excellent thermal conductivity and electrical conductivity of copper, but also has the advantages of a lightweight, low price, and good ductility of aluminum. However, there are still many problems in the secondary processing of copper-aluminum composite panels. For example, when preparing copper-aluminum composite conductor bars by deep drawing, defects such as copper-aluminum delamination and surface cracking often occur. Deep drawing is a basic process of sheet metal plastic forming. Due to the difference in plastic deformation ability of dissimilar metals and the existence of interface brittle compounds, the deep drawing deformation behavior of composite sheets is more complicated.
The research shows that with the increase in the amount of strain in the stretching process, the continuous interface layer is fractured. At the end of the stretching, the interface layer is severely fractured and distributed in fragments. The microcracks initiated in the interface layer will not propagate to the copper layer at the time of fracture. In or aluminum layer, the broken interface layer also plays a role in the co-deformation of copper and aluminum.
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