Abstract
Metal matrix composites (MMCs) possess significantly improved properties including high specific strength, specific modulus, damping capacity and good wear resistance compared to unreinforced alloys. The metal matrix choices for Al6061 matrix were silicon carbide (SiC), magnesium oxide (MgO) in constant proportions with either zirconium dioxide (ZrO2) or alumina (Al2O3) as the reinforcements. The stir casted samples were tested for their tensile strength, impact strength and wear. The results confirmed that stir formed Al6061 with Al2O3, MgO, SiC, ZrO2 reinforced composites is clearly superior to base Al6061. It is found that elongation tends to decrease with increasing particles weight percentage, which confirms that alumina and ZrO2 addition increases brittleness. It appears from this study that ultimate tensile strength and yield strength trend to increase with an increase in weight percentage of the reinforcements in the matrix. Impact strength is increased by adding Al2O3 and MgO, SiC, ZrO2.
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