Abstract: The uniaxial tensile properties of two aluminum foams (open-cell and closed-cell foams) with a variety of densities were studied and compressive tests were carried out.The tensile stress-strain curves of open cells and closed cells all showed short elastic deforming region and plastic region without apparent plastic point.Young′s modulus and strength of open cells with high density were higher than those of closed cells.The mechanical properties increased with increasing relative density of foams.The tensile strength was lower than compressive strength,however,Young′s modulus was larger in tension than in compression.