Abstract
Metal foams of aluminum (Al) find diverse applications in several domains such as in automotive and sports equipment industry as impact, acoustic and vibration absorbers, the aerospace industry as structural components in turbines and spatial cones, in the naval industry as low frequency vibration absorbers, and in construction industry as sound barriers inside tunnels, as fire proof materials and structure protection systems against explosions and even in heat exchangers, orthopedic components, and decorative items. Here, we report on the development of Al foams by a low cost and convenient technique of casting with efficient control over size, geometry and distribution of the pores. Spherical balls of leachable salts were packed in a crucible of desired shape. Molten Al was cast into the salt pattern in the mould. The final products were obtained after cooling followed by leaching of the salt pattern. Shape and size of the pores were evaluated from photographic images of the foams. Mechanical properties of the derived samples were studied with a universal testing machine under compressive loading.
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