Effect of Temperature Parameters on Microstructure of Cast Mg/Al Composites

Abstract

To examine the impact of the composite region temperature on the interface microstructure of AZ31B/6061 layered composites, while solid–liquid phase casting, we analyzed the temperature field during the preparation process. Subsequently, we carried out testing for microstructure characterization and mechanical properties. It was determined that a composite interface temperature below 620 ℃ leads to the formation of a diffusion region dominated by one-way diffusion and interface reaction of Al atoms. When the temperature of the composite interface exceeds 630 ℃, a mixed liquid of Mg and Al forms, promoting the diffusion and collision of diatoms and causing violent convective diffusion and thermal diffusion reactions. This leads to the formation of composite layers and composite regions. Temperature parameters significantly impact the casting of Mg/Al laminated composites, primarily through factors such as thermal stress and deformation, element diffusion rate and distance, and interface reaction. When controlling the casting temperature at 720 ± 10 ℃ and the regional temperature at 630 ± 10 ℃, the Mg/Al laminated composite with the most optimal composite effect can be prepared. It is important to maintain this temperature range in order to achieve the desired result.