Synthesis, characterisation and mechanical properties of SiC reinforced Al based nanocomposites processed by MA and SPS

ISSN： 1743-2901

Source： Powder Metallurgy, Vol.56, Iss.2, 2013-04, pp. : 149-157

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Abstract

Al based alloys reinforced with different amounts (5, 12 and 20 wt-%) of nanosized SiC particulates were synthesised by mechanical alloying and consolidated by the spark plasma sintering (SPS) technique. The distribution of the reinforcement phase in the composite was evaluated as a function of the milling time and the amount of SiC. The processed materials were characterised by scanning electron microscopy and energy dispersive spectroscopy for the morphology and composition and X-ray diffraction. Continuous reduction in crystallite size was observed as milling progressed and after milling for 20 h the resulting powders reached a grain size of <100 nm.="" these="" al‐sic="" composites="" were="" successfully="" consolidated="" by="" the="" sps="" method="" at="" different="" sintering="" temperatures="" of="" 400,="" 450="" and="" 500°c.="" it="" is="" suggested="" that="" a="" higher="" hardness="" can="" be="" achieved="" even="" at="" 20="" wt-%sic="" when="" a="" higher="" sintering="" temperature,="" for="" example,="" above="" 500°c,="" is="" used.="">