Process and performance study of ultrasonic consolidation of Al-Mg laminated composite materials

In this study, Al 1060-Mg AZ31B laminated composites with sequential interlayer were successfully prepared by ultrasonic consolidation (UC) technique. By comparing the microscopic morphology and mechanical properties of the Al-Mg composites under different processes, it was found that the interface of the composites prepared under the consolidation process of 150°C+2.9 KN+15 mm/s+29 um was well bonded, and the interface showed irregular three-dimensional（3D）dentate interface. The interfacial bonding was determined by peeling experiments and SEM for atomic diffusion and mechanical tooth bonding. The electron backscatter diffraction (EBSD) analysis of different areas of the laminate interface revealed that dynamic recrystallization and grain refinement occurred in the surface layer of Al foil after consolidating, and grain breakage in the surface layer of Mg foil by shear force also occurred, and the grain refinement phenomenon improved the tensile strength of the base material. The tensile strength of Al-Mg laminated composites was found to be higher than the theoretical strength in the elastic deformation stage, and the two were well matched in the plastic deformation stage. During the consolidation process, not only the dentition phenomenon occurs, but also the interfacial strengthening effect occurs, which improves the overall synergistic plastic deformation ability of the composite.