Synthesis, characterisation and mechanical properties of SiC reinforced Al based nanocomposites processed by MA and SPS
Abbreviated Journal Title
Aluminium alloys; Silicon carbide; Mechanical alloying; Spark plasma; sintering; Microstructure; Hardness; STRUCTURAL EVOLUTION; MATRIX COMPOSITES; PARTICLES; POWDERS; ALLOYS; Metallurgy & Metallurgical Engineering
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 degrees 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 degrees C, is used.
"Synthesis, characterisation and mechanical properties of SiC reinforced Al based nanocomposites processed by MA and SPS" (2013). Faculty Bibliography 2010s. 3599.