In this research, the feasibility of adding mechanically activated nano-crystalline Al 2 O 3 particles into aluminum matrix was investigated. For this purpose, Al 2 O 3 powder was milled in a high-energy ball mill for 20 h. Subsequently, 1 wt.% of Al 2 O 3 powder was added to molten Al. Then microstructure, powder characterizations and mechanical and wear properties of this composite were studied. Peak broadening of the diffraction patterns clearly showed that Al 2 O 3 crystallites were in the nanometer scale after milling. Furthermore, distributing a small amount of Al 2 O 3 particles on the aluminum matrix was a heterogeneous feature and the grain size of the matrix consequently decreased. Due to the existence of hard particles and hence smaller crystalline size, hardness, yield strength and wear resistance of Al-Al 2 O 3 composite significantly rised.

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