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Fabrication and characterisation of ultrafine-grained Al-5vol%Al 2O3 nanocomposite

Razavi Hesabi, Z ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1504/IJNM.2010.033877
  3. Abstract:
  4. 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 were measured and compared with those of monolithic Al. The results show a significant increase in the strength of Al due to ultrafine-grained structure coupled with the nanoparticles induced strengthening mechanisms
  5. Keywords:
  6. Al-Al2O3 ; Nanocrystalline metal matrix nanocomposite ; Alumina nanoparticle ; Average particle size ; Characterisation ; Compressive properties ; Elongated grains ; Matrix ; Mechanical milling ; Mechanical strength ; Nanocrystalline metal ; Nanocrystallines ; Nanometric alumina ; Powder extrusion ; SEM ; Severe plastic deformations ; Strengthening mechanisms ; TEM ; Ultrafine grained structure ; Ultrafine-grained ; XRD analysis ; Crystallite size ; Extrusion ; Mechanical alloying ; Mechanisms ; Metallic matrix composites ; Milling (machining) ; Nanocomposites ; Nanocrystalline alloys ; Nanocrystalline powders ; Nanoparticles ; Powder metals ; Tensile strength ; Aluminum
  7. Source: International Journal of Nanomanufacturing ; Volume 5, Issue 3-4 , 2010 , Pages 341-351 ; 17469392 (ISSN)
  8. URL: http://www.inderscienceonline.com/doi/abs/10.1504/IJNM.2010.033877?journalCode=ijnm