Preparation of 2024-Al/AZ31-Mg Laminated Composite by Powder Metallurgy Integrated Forming and Sintering

Herein, an 2024-Al/AZ31-Mg laminated composite was prepared by hot-pressing sintering using powder metallurgy integrated forming and sintering. Effects of sintering temperature on the microstructure and mechanical properties of the matrix and interface of Al/Mg laminated composites were investigated. The mechanisms of interface formation and evolution were obtained. The results indicate that with sintering temperature increases from 475°C to 550°C, the densification of the Al/Mg matrix gradually increases. Intermetallic compounds were generated at the interface, and their thickness increased from 56.4 μm to 195.1 μm. In addition, the interface structure was composed of an Al7Cu3Mg6, Al3Mg2 and Al12Mg17 layer. At a sintering temperature of 525°C, the tensile strength and interface shear strength of Al/Mg laminated composites were 37.8 MPa and 31.13 MPa, respectively. The shear fracture occurred between the Al3Mg2 layer and Al12Mg17 layer and was a mixed cleavage and intergranular fracture.