In this study, pure aluminum and pre-alloyed Alumix 231 ( Al-Cu %2,5-Mg %0,5-Si %14) based composite foams reinforced with Al2O3 particulate have been produced by powder metallurgy route. 1% titanium hydrate powders and 1-3-5-7% Al2O3 particulates have been added to Al and Alumix 231 powders and mixed in a three dimensional mixer. Mixed powders were then pressed at 600 MPa pressure to produce block samples which were sintered at 550 degrees C for 3 hours. After then foaming process has been carried out at 690 and 710 degrees C. Foamed samples were taken from the furnace and cooled in open air. Effects of Al2O3 particles on the lineer expansion, density and the size of porosity have been determined.