Effects of SiCp Parameters on Microstructures, Interface Structure and Mechanical Property of Mg Bulk Composites Produced by Ultrasonic Vibration Processing

摘要

In this study, the effects of submicron silicon carbide particulates (SiCp) addition on microstructures of the SiCp/AZ31B composites prepared by stir casting combined with ultrasonic vibration, as well as on the interface and the tensile behavior of AZ31B alloy were discussed. Most of the SiCp tended to aggregate in the last solidified regions (such as grain boundaries) during solidification. Microstructural characterization of the developed magnesium matrix composites also revealed significant grain refinement. The grain of composite was refined by increasing particle volume fraction. Moreover, better interfacial bonding was realized in the composite. Tensile test results showed that strengths of the submicron SiCp/AZ31B composites were enhanced significantly whilst as the amount of submicron SiCp were increased, the strengths of the SiCp/AZ31B composites also increased.