Effects of Si content on the microstructure and tensile strength of an in situ Al/Mg2Si composite

Al/Mg2Si composites were in situ fabricated by the usual die-casting technique, and effects of the Si contents in the composites on microstructures and tensile strengths were investigated, Experimental results show that extra Si contents in Al/Mg2Si composites induce a ductile matrix and a uniform distribution of in situ particles. The refined microstructures lead to an obvious increase in both strength and ductility of the metal matrix composites (MMCs), The effects of extra Si on both the solidification process and fracture characteristics of the Al/Mg2Si composites were analyzed.