Preparation, microstructure and mechanical properties of CP-Ti/AA6061-Al laminated composites by differential temperature rolling with induction heating

Abstract

In this research, a new, innovative method of differential temperature rolling with induction heating was proposed to prepare CP-Ti/AA6061-Al laminated composites in an argon protective atmosphere. The homogeneous deformation of titanium and aluminium was obtained, and the effect of rolling reduction on the mechanical properties and microstructure of the laminated composites was investigated in detail. The results showed that the interfacial bonding strength gradually increased with the rolling reduction, which was attributed to the increased mechanical meshing area and the wider element diffusion layer, leading to the microstructure of shear surface changing from brittle fracture to ductile fracture. When the rolling reduction was 50.5%, the shear strength of the Ti/Al clad plates reached a peak value of 122 MPa, close to the shear strength of the aluminium matrix (131 MPa). Ti/Al composites could improve the ultimate tensile strength of a single aluminium sheet. After tensile failure, the interfacial delamination length decreased from 7.64 mm to 0.22 mm with the reduction ranging from 17.5% to 50.5%, indicating that the strong interface could effectively impede the expansion of the interfacial delamination cracks, resulting in the improved resistance to delamination of composites. In summary, through the unique form of assembly and heating, the Ti/Al laminated composites achieved satisfactory microstructure and mechanical properties.