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In-situ Al-MgAl 2 O 4 metal matrix composite was successfully manufactured using SiO 2 with the aid of ultrasonication. MgAl 2 O 4 particles and their clusters were identified at grain boundaries and interdendritic regions within the grain envelopes. The composite showed 2-5 fold of grain size reduction with respect to the reference alloy cast at similar conditions. The composite has shown 10% increase in yield stress and 15% increase in UTS while maintaining the ductility similar to reference alloy. CTE mismatch strengthening and grain boundary strengthening are suggested to be influencing in the improvement in mechanical properties.