OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 25 No. 4 2023 The effect of cell size, partition thickness, and pore circulation on the compressive strength of aluminium foam was investigated using the FEM method. Aluminium foam is obtained by stir casting with the addition of titanium hydride (foaming agent) to the molten metal [18]. The purpose of this research paper is to successfully develop aluminium metal foam by stir casting and calculate the porosity of metal foam with various mechanical properties such as hardness, compressive strength, impact energy and these mechanical properties should be commensurate with the original aluminium material. The methods of investigation Materials In this study, aluminium with medium strength and corrosion resistance is used as the main material. It is widely used in the automotive and aerospace industries. It has also found mechanical application, for example, in water-cooled manifolds, road transport fitting, etc. The chemical composition of commercial pure aluminium in weight percentages: Si (0.096), Fe (0.356), Cu (0.009), Mn (0.002), Mg (0.001), Zn (0.003), Ti (0.008), V (0.006) and Al (99.52). To create a metal foam, 500 g of aluminium with a density of 2.65 g/cm3 and a melting point of 800 °C. were taken. Calcium carbonate was used as a foaming agent, its density is 2.93 g/cm3, the melting point is 825 °C. The optimal amount of foaming agent is 2.5 % of the weight of the aluminium material [6]. Calcium carbonate is an anhydrous and stable compound shown in fig. 1. Its advantages are that it decomposes slowly and therefore gives a better porous structure to the solidified metal. Fig. 1. General view of calcium carbonate particles used as a foaming agent Calcium carbonate decomposes into calcium oxide and carbon dioxide. Decomposition occurs when this foaming agent is added to molten aluminium. The aluminium obtained has a porous structure due to the release of carbon dioxide. Using these materials, a metal foam material with closed porosity was developed. Method Stir casting method During the implementation of the stir casting process, the foaming agent and the base metal are evenly mixed and best wettability is achieved. A lower rotation speed of the stirrer and a short mixing time can lead to non-uniform mixing of calcium carbonate in molten aluminium, because of this, powder accumulation may occur in different places and as a result large voids will form in the final material. The mixing time is
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