Deformation Mechanism and Interfacial Bonding Performance of Mg/Al Composite Plates by Snake Rolling

Plate warping and insufficient interfacial bonding strength easily occur when Mg/Al composite plates are prepared by traditional synchronous rolling processes. A novel asymmetric snake rolling process is proposed in this article. AZ31B magnesium alloy and 5052 aluminum alloy were used for this study. The effects of snake rolling on the macroscopic morphology, microstructure evolution, and mechanical properties were investigated by comparing the deformation behaviors between snake rolling and synchronous rolling under different thickness ratios, combined with the finite element method (FEM) and microstructure characterization. The results indicate that the additional shear strain introduced by the staggered rolls in snake rolling, can effectively suppress the warping tendency of the composite plates and significantly improve the plate flatness. At the microscopic level, the shearing action significantly refines the matrix grains, reducing the grain size on the Mg side to 2.1–2.4 μm, and promotes the fragmentation of interfacial metal oxide films and atomic diffusion. The tensile strength of the snake‐rolled samples reaches 250 MPa, the elongation reaches a high level of 25%–27%, and the interfacial tensile‐shear strength reaches to a maximum of 72 MPa, respectively. This study provides important theoretical support and a technical pathway for fabricating high‐performance Mg/Al composite plates via snake rolling.