Interface characteristics and mechanical behavior of Cu/Al clad plate produced by the corrugated rolling technique

Corrugated Cu/Al clad plates are prepared by the corrugated roller with a reduction ratio of 50 % at room temperature. The effects of this rolling technique on the interfacial characteristics and mechanical properties have been evaluated. Microstructure results show that the Cu/Al interface is excellent combination and the grains near the interface are significantly refined, especially at the trough position. The reason for grain refinement at the interface can be attributed to the inhomogeneous strain induced by the corrugated roller, which can improve the bonding strength of the clad plate. Gauss texture appears at the Cu and Al substrates both at peak and trough positions, but the texture intensity is low. The peeling curve of the corrugated sample shows a trend of rising first and then decreasing quickly and the average peeling strength value reaches 135 N/cm. The tensile-shear strength at trough position reaches 80 MPa. The ultimate tensile strength of the sample at trough position reaches 237 MPa, which is 18 % higher than that the peak position. Excellent mechanical properties can be obtained for the corrugated Cu/Al clad plate mainly due to the grain refinement and corrugated-shape interface under the action of inhomogeneous stress distribution.