The structural, automotive, aerospace, and marine industries have recently shown a significant increase in interest in aluminum composite foams due to their exceptionally low weight and superior mechanical qualities. In the current work, stir casting was utilized to create closed-cell aluminum foams with different porosities (68–89%) while employing CaCO3 (0.5–3.5 wt%) as a foam-producing substance and calcium (Ca-1.5 wt%) as a viscosity-boosting component. The study examined the behavior of these foams when subjected to uniaxial compressive loading, focusing on their stress–strain responses. The mechanical characteristics of ACFs (yield strength, plateau strength, and modulus of elasticity) have been found to be improved by the addition of CaCO3. When up to 3 wt% of CaCO3 is added, the energy absorption capacity of ACFs increases; a higher CaCO3 concentration causes a decrease. Density and cell wall thickness are shown to rise as the wt% of CaCO3 escalates, but the scale of the pores and the level of porosity diminish as the wt% of reinforcement increases. This article discusses the porousness and dispersion of pore sizes and the circularity of AA 6061 foam on a CaCO3 blowing agent. Additionally, it is observed that the microstructural characteristics of ACFs were significantly impacted by the stirring temperature, with 750 °C being the minimum stirring temperature required to cause aluminum foaming.