Investigation of the Annealing Effects on Mechanical Properties and Interfacial Characteristic of TA1/Al5083 Bimetal Composite

The influence of annealing treatment on the mechanical properties and interfacial characteristics of a TA1/Al5083 bimetal composite was investigated in this research. The bimetal composite plates were prepared by explosive welding and annealing at temperatures ranging from 400 to 550 °C at intervals of 50 °C for 3 h. Uniaxial tensile and shear tests were employed to study the influence of the annealing treatments. Uniaxial tensile tests indicate that the tensile strength and elongation display a tendency to first improve and then decrease with increasing annealing temperature. No obvious necking phenomenon is observed in the composite sheet annealed at 400 and 450 °C, and extremely short cracks appear in the interfacial transition zone, while localized necking and delamination phenomena are found to occur in the composite sheet annealed at 500 and 550 °C. The ultimate tensile strength and elongation of specimens annealed at 450 and 500 °C is improved, while specimens annealed at 550 °C show a serious deterioration in elongation. In addition, shear tests demonstrate that the shear strength first improves and then decreases with increasing annealing temperature. On the basis of a finite element method (FEM) simulation, a cohesive zone model is validated to reveal the interfacial characteristics. The research results obtained in this work provide a direction for further investigation and design of bimetal or laminated composite components for application in industrial fields.