Abstract

In this study, Al alloy LM13-SiO2 composites were produced by stir casting method using SiO2 powder as
reinforced particles with 150 μ average diameter and Al alloy as the matrix metal. The melt composites were
stirred and then cast into a metallic mold. Different samples of 3, 6, 9, and 12 wt.% of SiO2 were produced. The
casted composite specimens were machined as per ASTM test standards. Effects of wt.% of SiO2 particles on wear,
tensile strength, and hardness of Al alloy LM13-SiO2 composites have been investigated. The microstructures of
the composites were studied to know the dispersion of the SiO2 particles in the matrix. The highest tensile strength
was achieved in the specimen containing 12 wt.% of SiO2, in comparison to the unreinforced Al alloy. It has been
observed that addition of SiO2 particles significantly improves wear resistance, tensile strength, and hardness
properties as compared with that of the unreinforced matrix.