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 degrees C to 550 degrees C, the densification of the Al/Mg matrix gradually increases. Intermetallic compounds were generated at the interface, and their thickness increased from 56.4 mu m to 195.1 mu m. In addition, the interface structure was composed of an Al7Cu3Mg6, Al(3)Mg(2)and Al(12)Mg(17)layer. At a sintering temperature of 525 degrees 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 Al(3)Mg(2)layer and Al(12)Mg(17)layer and was a mixed cleavage and intergranular fracture.