Metallic foams are commonly produced using hydride foaming agents. Carbonates are safer to handle than hydrides; furthermore a fine and homogenous cell structure can be obtained in the powder metallurgy route. In this study, the effects of mass fraction of magnesium carbonate and dolomite as a foaming agent on cell structure and mechanical properties of the foams were investigated. Dolomite gave more fine and homogenous cell structure than magnesium carbonate. Average cell size of the foam by dolomite was twenty times less than that of the foam by TiH₂. The dolomite-foam showed higher plateau stress than the TiH₂-foam; therefore, dolomite-foam has high energy absorbing capability.