25 research outputs found

    Short carbon fiber-aluminium matrix composite material prepared by extrusion of powder mixtures

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    Unidirectional short carbon fiber/aluminum matrix composites have been prepared by hot extrusion of fiber/powder mixtures. Effects of processing parameters on the fiber length and the interfacial reaction between fibers and aluminium have been studied. Composites with different fiber volume fraction (up to 15 vol. %) were tested on their longitudinal stiffness and tensile strength at room as well as elevated temperatures to investigate the strengthening effect caused by addition of fibers into the matrix material. An experiment of annealing of the composites was done to study the influence of annealing time and temperature on the interfacial bonding strength and on the amount of reaction product (Al4C3) at the interface

    The role of oxidation in blowing particle stabilised aluminium foams

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    The role of oxidation in blowing particle stabilised aluminium foams Metal foams were produced by blowing gas into aluminium alloy melts. The effect of oxygen content of the blowing gas on composition and structure of the inner surface of the foam cells is studied by varying gas composition from nitrogen and air to pure oxygen. Scanning Electron Microscopy, Auger Electron Spectroscopy and Transmission Electron Microscopy are used to analyse the surfaces. Initially particle free melts are pre treated by bubbling air through them after which a certain degree of foam stability is achieved. The oxidation products are characterised by microscopy on such foams. Different alloys stabilised with Al2O3 or SiC particles showed the highest stability. Segregation of these particle is shown to be influenced by the oxide content of the blowing gas
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