Effect of Magnesium on The Microstructure and Tensile Properties of Al2O3/Cu-A356 Cast NanoComposites

The effect of magnesium as a wetting agent on the microstructures and tensile properties of castable particulate metal matrix composites has been studied. The particulate metal matrix composites had similar matrix alloy (A356) but with reinforcing fine particles (alumina). Results showed that the addition of 7% magnesium makes a modest improvement to the yield strength, ultimate tensile strength and elongation percentage values , and the scatter of these properties, but makes a significant improvement to minimum strength and elongation results. Microstructural examinations by scanning electron microscopeand energy dispersive spectroscopy analysis of metalmatrix composites showed segregation of magnesium alumina particles. Further results showed that the addition of higher magnesium levels contributes to the over-modification of the eutectic silicon and decreases mechanical properties

کلیدواژه ها:

Magnesium ، Metal Matrix Nano Composite ، Stir casting ، Wettability ، Intermetalic Particles