Density Dependence of the Compressive Behaviors of Closed-Cell Al Foams Manufactured Through Powder Metallurgy Route

The compressive deformation behaviors of closed-cell Al foams manufactured through powder metallurgy route with various relative densities have been studied. The high-density specimens displayed smoother stress-strain curves and more stable compressive behaviors. The stress-strain curves for low-density specimens displayed a regular fluctuation and more than one stress drop were observed. This can be attributed to the different deformation mode due to density variation. The effect of relative density on the stress drop ratio was studied. The results show that the stress drop ratio decreases with relative density. The compressive deformation mode changes as the relative density is < 0.15.