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Fabrication and characterisation of ultrafine-grained Al-5vol%Al 2O3 nanocomposite
, Article International Journal of Nanomanufacturing ; Volume 5, Issue 3-4 , 2010 , Pages 341-351 ; 17469392 (ISSN) ; Simchi, A ; Seyed Reihani, S. M ; Simancik, F ; Sharif University of Technology
Abstract
Nanocrystalline Al-5vol%Al2O3 nanocomposite was synthesised by mechanical milling of a mixture containing nanometric alumina with an average particle size of 35 nm. Morphology of as-synthesised powder was investigated by SEM while crystallite size of Al matrix was determined by XRD analysis. The results confirmed formation of nanocrystalline Al matrix induced by severe plastic deformation during mechanical milling. Nanocomposite bars were produced by hot powder extrusion route. TEM investigation of as-extruded nanocomposite revealed formation of elongated grains along the extrusion direction decorated by alumina nanoparticles. Tensile and compressive properties of as-extruded nanocomposite...