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  • The influence of foaming precursor's composition and denisty on the foaming efficiency, microstructure development and mechanical properties of aluminium foams = Vpliv sestave in gostote prekuzorjev za penjenje na učinkovitost penjenja ter razvoj mikrostrukture in mehanskih lastnosti aluminijskih pen
    Kevorkijan, Varužan ...
    In this work, the influence of the composition as well as the density and the porosity of the foaming precursors on the foaming efficiency, the microstructure development and the mechanical ... properties of aluminium foams are presented and discussed. Foams were prepared, starting from precursors made either by the powder metallurgy (PM) or by the melt route. Following the PM route, precursors were made by mixing Al powder and 3-10 vol.% of dolomite or calcium carbonate praticles of various particle size (from 20 to 120 [mu]m) and cold isostatically pressing of the obtained mixture at 700 MPa. In the case of the melting route, precursors were made by introducing dolomite or calcium carbonate particles directly into the molten aluminium at 700°C. After melt stirring, the precursors were prepared by casting the semi-solid slurry into a cylindrical water-cooled mould. Finally, aluminium foams were made in all cases by inserting precursors into a cylindrical stainless-steel mould and heating the arrangement at 750 °C for 10 min. After that, the mould was removed from the furnace and the foaming process was stopped by its cooling in air to room temperature. The microstructure of the obtained foams was investigated by optical and scanning electron microscopy (SEM-EDS), while XRD was applied for a detailed identification of the phases presented. The qualityof the precursors was evaluating by determining their mechanical properties (uniaxial room-temperature compression stress-strain curve, compressive strength and energy absorption after a 30% strain) and the foaming efficiency (the relative density of the foam obtained). The concentration of the foaming agent and the density of the precursors were observed to have a detrimental influence on the foaming efficiency as well as on the foam microstructure and mechanical properties. The foaming of precursors with open porosoty was inefficient.
    Vir: Program in knjiga povzetkov = Program and book of abstracts (Str. 60)
    Vrsta gradiva - prispevek na konferenci
    Leto - 2010
    Jezik - angleški
    COBISS.SI-ID - 838314

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