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    An investigation on corrosion behaviour of pressure infiltrated Al-Mg alloy/SiCp composites
    (Pergamon-Elsevier Science Ltd, 2009) Candan, Sennur
    In this study, effect of Mg alloying addition (2-8 wt.%) on corrosion behaviour of Al matrix composites, in 3.5 wt.% NaCl environment, has been investigated. Composites were produced by pressure infiltration technique at 750 degrees C and had a SiC particle (SiCp) volume fraction of similar to 60%. Results were evaluated by using potentiodynamic polarisation measurements, immersion tests, SEM, EDS and XRD analysis. Compared to the pure All matrix, mass loss of the composites decreased with increasing Mg content. Experimental results revealed that intermetallics as a result of reaction between Al-Mg alloy and SiC particle has beneficial effect on corrosion resistance of the composites due to interruption of the continuity of the matrix channels within the pressure infiltrated composites. (C) 2009 Elsevier Ltd. All rights reserved.
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    Wettability of Aluminum-Magnesium Alloys on Silicon Carbide Substrates
    (Wiley, 2011) Candan, Ercan; Atkinson, Helen V.; Turen, Yunus; Salaoru, Iulia; Candan, Sennur
    Wettability between the liquid matrix and the reinforcement is important for the processing of metal matrix composites; the contact angle can be measured with the sessile drop method. However, for the wetting angle of liquid Al-Mg alloys on ceramics, it is difficult to obtain an accurate measurement because aluminum is easily oxidized and the rate of evaporation of Mg is high. Here, an oxide-stripping device is used to provide an aluminum alloy droplet with minimal oxide on the surface when the droplet makes initial contact with the substrate. Results are reported for contact angle (theta) versus time for Al-2.1, 3.9, 9.1, and 14.2 wt% Mg alloys with sintered silicon carbide substrates. The samples were quenched from the test temperature. Magnesium plays a key role in the adhesion, or otherwise, of the droplet to the substrate. Magnesium is probably migrating to the surface of the droplet and evaporating or forming a crusty layer on the surface over time. When viewed from above, halo regions, initially showing interference colors, develop on the substrate around the base of the droplets. These are probably associated with Mg (and Al) diffusing from the droplet across the surface of the substrate.
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