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In this paper we consider deformation behaviour and energy absorption ability of the heattreated aluminium foams AA6061 and AA7075 with respect to variability of pore structure and defects in cell wall affected by the chemical composition of the foamable precursor itself. The work was focused on the evaluation of cell wall microstructure, the geometry of pores and defects present within the cell walls, and their influence on strength and deformation behaviour properties of the foam.

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