Research On Deformation Behavior And Binding Mechanism Of Metal Cold Rolling Composite

As a metal-based composite material,the copper-aluminum composite material has a highly electrical conductivity and excellent thermally conductivity,excellent performance of the copper and the corrosion resistance of the aluminum.The Cu-Al composite material has been widely used in mechanical equipment,power electronics,cars field and so on,specific application include copper-clad aluminum cables,heat sink welding fins,electronic packages.In order to prepare a copper-aluminum composite material having excellent performance,In this research,combined finite element simulation and rolling experiment to cold roll pure copper(TP2)and pure aluminum(1060)materials at room temperature,Further studied the deformation behavior and interface bonding mechanism of Cu-Al composite strip by changing rolling parameters and annealing process.In order to study the effects of different rolling parameters on the combination of TP2 pure copper and 1060 pure aluminum,Using the nonlinear finite element software MSC.MARC to establish the two-dimensional copper strip and aluminum strip cold rolling composite finite element model.The influence of the degree of reduction in pass and the ratio of Cu-Al thickness on the velocity variation of the bonding interface was analyzed by introducing the velocity field,Further studied the difference of rolling speed required for the rolling compound of pure Cu-Al was further quantitatively described,which provided a theoretical criterion for the bonding of pure Cu-Al.In order to study the influence of rolling speed,thickness ratio of copper and aluminum,the degree of reduction in pass on the warpage of copper and aluminum composite strip,In order to explore the effect of the degree of reduction in pass,the ratio of copper strip thickness to aluminum strip thickness was 1 to 4,and the rolling speed is 175mm/s,the Cu-Al composite strip is cold-rolled at different the degree of reduction in pass;for investigate the influence of rolling speed,the ratio of copper strip thickness to aluminum strip thickness was 1 to 6 and the degree of reduction in pass was 70% and the rolling speed range was 125mm/s?225mm/s.The cold-rolled Cu-Al composite strip was obtained;In order to explore the influence of thickness ratio,the ratio of copper strip thickness to aluminum strip thickness was 1 to 4,1 to 5 and 1 to 6respectively,the degree of reduction in pass is 60%,and the rolling speed is 175mm/s.Combined with the variation law of average plastic strain of copper strip and aluminum strip and the expression of curvature formula,the influence law of rolling parameters on the warpage of composite strip is obtained.In order to study the effect of rolling parameters on the interfacial bonding strength and microstructure properties of copper-aluminum composite strip,tensile machine,optical microscope,electron microscope and other methods were used to analyze the change rule of peel strength and interfacial microstructure,so as to provide a basis for optimizing copper-aluminum cold rolling composite process and further explain the bonding mechanism of copper-aluminum composite strip.In order to study the effects of annealing temperature and annealing time on the evolution of interfacial microstructure composition and the thickness of compound diffusion layer were discussed.The effect of annealing temperature was studied.The sample was treated with a temperature of 300??450? for 1h.The effect of annealing time was studied.The samples were treated at 350? and held for 0.5h,1.5h and 4h.SEM and EDS were used to scan and analyze the composition of the bonding interface.The experimental results show that when the annealing temperature is 350? and the annealing time is 1.5h,the Cu-Al composite strip with excellent properties can be obtained.