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A NONDESTRUCTIVE ELECTRICAL METHOD FOR EVALUATING MECHANICAL PROPERTIES OF AL-FOAM

Al alloy foams of composition Al-3wt.%Si-2%Cu-2%Mg was produced using powder metallurgical method. Mechanical properties of foams having different density were measured using uni-axial compression test and the measured properties such as elastic modulus and strength were compared with those of other existing commercial foams. The newly produced (Al-3%Si-2%Cu-2%Mg alloy) foams showed comparable strength and elastic modulus with other existing commercial foams. Electrical conductivity of the foams was measured. Mathematical relations were established between electrical conductivity and compressive properties of Al-foams with an aim to propose a nondestructive method for evaluation of mechanical properties of foams based on electrical conductivity. Curves obtained from derived relations fit very well with the experimental result.