OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 25 No. 4 2023 Fig. 4. Aluminium melt poured into the mould Al2O3, Al4C3, and MgO increase the viscosity of the molten metal, which makes it difficult for the bubbles of gases released during the decomposition of calcium carbonate to rise. These gas bubbles create a porous structure of semi-solidified material. After an hour, the molten metal completely solidifies. The result is aluminium foam, as shown in fig. 5 and fig. 6. To analyse the inner surface of the resulting casting, it was cut into two parts using EDM. Fig. 5. Solidified aluminium foam Fig. 6. Aluminium foam cut Results and Discussions After obtaining aluminium foam, its properties such as density, porosity percentage and microstructure were analysed. Density and porosity Density and porosity are crucial factors in the quality of the foam metal. If the foam density decreases, the porosity increases. In this study, the density was calculated. • The mass of the specimen was measured using an electronic balance. • The volume of the specimen was calculated. • Relative density.
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