Al

2O

3/Cu composites with dispersive fine Al

2O

3 particle were prepared by internal oxidization on aluminized Cu-Al-Y alloy by using residual oxygen in commercial N

2 gas as agent

in which aluminized treatments for Cu-Al-Y alloy with RE compound CeCl

3 and without CeCl

3 were conducted. The microstructure of aluminized layer

hardness distribution and microstructure of internal oxidation layer were investigated. The results show that RE compound CeCl

3 has more remarkable effect on aluminized Cu-Al-Y alloy

and it has a thicker and more uniformity aluminized layer at the same conditions compared to that of the alloys without being treated. Dispersed enhancing Al

2O

3 particle layer with the thickness of 280 μm on the alloy can be formed after internal oxidation.