Formation mechanism of the corrugated interface during Al/Mg/Al composite plate by hard-plate rolling

Regulating the interface structure and bonding ability is one of the main means to improve the mechanical properties of the composite plate. Therefore, the aluminum (Al)/magnesium (Mg)/aluminum (Al) composite plate was rolled by adding a hard plate, and the influence of the interface bonding morphology on the mechanical properties of the composite plate was studied. The results show that under the same conditions, the corrugated bonding morphology is formed at the Al/Mg interface by hard plate, while the traditional rolling (TR) tends to be flat. The ultimate tensile strength (UTS) of the composite plate is 232.16 MPa, and the percentage of total elongation at fracture (At) is 14.3%, which is 7.36% and 45.22% higher than that of the traditional rolling. The texture intensity of the Mg and Al sides of the corrugated interface is greatly weakened compared to the flat interface, and the strong non-substrate slip provides a strong condition for its subsequent plastic deformation. At the same time, a large number of twins at the interface hinder the dislocation movement and improve the tensile strength of the composite plate, which realizes the double increase of strength and plasticity of the composite plate. It provides scientific advice for interface structure and optimized performance of high-performance composite plates, and has good industrial production and application potential.