Fabrication mechanism of in-situ synthesized Al₃Ti reinforced Mg Al matrix composites by vacuum hot-pressing

In-situ Al₃Ti reinforced Mg-Al matrix composites were prepared by vacuum hot-pressing. The mechanism of in-situ synthesized Al₃Ti was discussed and a model of micro structural reaction between Ti and Al was brought forward. Effects of sintering schedules on microstructures of composites were researched by methods, such as XRD and SEM. Results indicate that Mg-Al matrix composites are dense in structure, while uniformly distributed in-situ Al₃Ti particulates with the size of 0.5~2.0 μm are combined closely with Mg-Al matrix. Small quantities of remnant Ti and intermediate phases Al-Ti also exist.