Casting-Cold Extresion Forming Technology Study And Microstructure Analysis Of Copper/Aluminum Clad Composite

Double-metal composition wire is a new wire material, which set two metals with different properties in one. Because of the electric current"skin effect", the copper/aluminum clad composite not only is high signal transmission characteristics, but also with advantages of light weight, high strength and low production cost, and the copper resources can be significant savings in particular. In this paper, copper/aluminum clad composite was prepared by casting-cold extrusion process and creatively different shaped cross-section copper pipes were designed in order to enhance metallurgical bonding performance of products. The forming process, force state in the process, and the micro-organization after deformation were researched by finite element simulation and experiment investation.Paper presented a casting - cold extrusion process for forming copper/aluminum clad composite, put forward the arc-shaped groove, U-shaped groove, T-slot design and other forms of copper pipe, and designed their structure and size. Forming die was designed by calculating a variety of extrusion parameters.Cold extrusion process of copper/aluminum clad composite billet was simulated by finite element method, deformation model was established and the stress and strain was analyzed during extrusion process, which proved the theoretical feasibility of the cold-extrusion process applied on producing copper/aluminum clad composite. The special-shaped copper pipe is more conducive to the interface of copper and aluminum metallurgical bonding was explained reasonably by stress and strain analysis in trough region.Experiment was carried out for casting-cold extrusion forming, and deformation process and force load was studied and compared with simulation results. The copper/aluminum clad composite was formed with good quality. In addition, the thickness, conductivity, squeeze pressure, thinning rates of the copper/aluminum clad composite were also analyzed.The microstructure of copper/aluminum clad composite in different deformation stages and different regions of the deformation process WERE observed and analyzed, which shows the distribution of the microstructure during extrusion process. The distribution rules of the microstructure were explained by maximum shear strain theory combined with the finite element simulation results. Metallographic test and EDS spectrum analysis are carried out to determine the interface of copper clad aluminum products, which shows a good metallurgical bonding property.