Abstract
Al–Mg base composites reinforced with different mixtures of nano-Al2O3 particles have been fabricated by mechanical stir casting and their metallurgical and mechanical characterization has been investigated. In this investigation, the Al2O3 particulates were reinforced into the base matrix of aluminium fabricated with five levels of volume fraction such as Al/0 vol.% Al2O3, Al/2 vol.% Al2O3, Al/4 vol.% Al2O3, Al/6 vol.% Al2O3 and Al/8 vol.% Al2O3. After the Al-base-nano-composites were fabricated by stir casting, the microstructure inside the matrix has been investigated using optical microscope. The hardness and the tensile properties of the nano-composites were evaluated at room temperature by using Vickers hardness and universal tensile testers, respectively. The result confirmed that stir cast AA5083 with uniform distribution of nano-Al2O3 particles enhances both tensile strength and hardness. With 6 wt.% of nano-Al2O3 indicating sensibly reasonably high strength by 29.53% and hardness by 24.65% when compared with matrix alloy.
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