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Title: Synthesis and characterization of aluminium-alumina micro- and nano-composites by spark plasma sintering
Authors: Dash, K
Chaira, D
Ray, B C
Keywords: Composites
Electron microscopy
Issue Date: 2013
Publisher: Elsevier
Citation: Materials Research Bulletin. Available online 22 March 2013
Abstract: In the present study, an emphasis has been laid on evaluation of the microstructural morphologies and their implications on mechanical performance of the composites by varying the reinforcement particle size. Nanocomposites of 0.5, 1, 3, 5, 7 volume % alumina (average size<50nm) and microcomposites of 1, 5, 20 volume % of alumina average size~10μm) reinforced in aluminium matrix were fabricated by spark plasma sintering technique at a temperature of 773K and pressure of 50 MPa. These micro- and nano-composites have been characterized using X-ray diffraction, scanning electron microscopy and transmission electron microscopy followed by density, microhardness and nanoindentation hardness measurements.The alumina nanoparticles revealed appreciable physical intimacy with the aluminum matrix than that of alumina microparticles. The highest nanohardness recorded 0.85 GPa and 99% densification for 7 and 1 vol. % Al-Al2O3 nancomposites respectively. Spark plasma sintering imparts enhanced densification and matrix-reinforcement proximity which have been corroborated with the experimental results.
Description: Copyright belongs to Elsevier
Appears in Collections:Journal Articles

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