Recrystallization and particle growth in Al-based SiC particle-reinforced composites

The recrytallization behaviour of Al-Si-Mg matrix composites reinforced with SiC particles of 10 and 20 vol.% and unreinforced matrix alloy have been studied. Also, the effect of annealing temperature and time on grain growth and particle coarsening has been evaluated. Cast ingots of the matrix alloy and composites were extruded at 500degreesC at an extrusion ratio of 10:1. The microstructures and hardness of the composite samples have been investigated. It has been found that particle volume fraction and size affect the recrystallization temperature of the materials