OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 25 No. 4 2023 Density of aluminium metallic foam ( f Al ρ ) mass of aluminium foam Density ( ) volume of aluminium foam Alf ρ = Mass of aluminium foam (mf) = 130 g Dimension of specimen (aluminium foam) = 50×40×35 mm The volume of specimen aluminium foam (Vf) = 70 cm3 The density of aluminium foam (ρf) = 130/70 3 1.8 g/cm . Alf ρ = The density of the parent aluminium material from which the aluminium foam was formed (ρAl) The mass of the initial aluminium material (specimen) = 143.59 g. Specimen size (initial aluminium material) = 60×41×22 mm. The volume of the initial aluminium specimen = 54.12 cm3. The density of the base metal = 143.59/54.12. 3 2.65g/cm . al ρ = Percentage porosity (P%) ( ) ( ) % Density of parent aluminium (Density of aluminium foam) Percentage Porosity ; Density of parent aluminium P − = ( ) ( ) % 2.65-1.8 Percentage of porosity P = 2.65 ; P% = 32 %. Relative density (ρR) ( ) R Density of aluminium foam material Relative density ñ = Density of parent aluminium material ; (ρR) = 1.8/2.65 = 0.67. The relative density is an important parameter characterizing the foamed material from the parent solid aluminium material. This is a comparison parameter that shows how much heavier a substance is than a standard substance. The estimated relative density is 0.67. This means that the weight of aluminium foam is 32 % less than that of parent solid aluminium. If aluminium foam is used instead of a solid aluminium part of the vehicle structure, then the weight of this part is reduced by 32 %. This type of material is necessary in the automotive and aerospace industries. Table 1 shows the various properties calculated for the developed aluminium foam. Microstructure analysis Field Emission Scanning Electron Microscope (FE-SEM) has been done to study the microstructure of aluminiumfoamproducedwith CaCO3. Standard size specimen (8×8×4) was prepared for themicrostructural analysis and its microstructure image is presented in fig. 7.
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