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Aluminium foams made of various aluminium alloys scrap and various foaming agents

Metal foams are lightweight materials with wide applications. Their production from chip waste promotes recycling and reduces the costs of the process. The main aim of this article was to analyze the differences between metal foams produced from different aluminium alloys and foaming agents. Base material used in experimental work were chips from aluminum alloys such as A360 (EN AC 43400), A380 (EN AC 46000), AA 6082 (EN AW 6082), and AA 7075 (EN AW 7075), whereas foaming agents were TiH2 and CaCO3. Relative densities, microhardness and homogeneity of obtained samples were investigated. It has been concluded that aluminium alloy foams obtained by using the foaming agent TiH2 regardless of the base material have more homogenous pores, higher expansion at lower temperatures, and also lower relative density, despite the lower percentage of the foaming agent. Aluminium foam produced out of aluminium alloy (A360) chips as base material, had the highest growth rate when the TiH2 agent was used, and the most homogeneous structure was obtained with AA 7075 alloy. On the other hand, foam made of alloy AA 7075, when foaming with CaCO3, had the most homogenous structure, and also the lowest relative density.

Aluminium foam ; Chip waste ; Recycling ; Closed cell foam ; Microhardness

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