Loading...

In situ synthesis of nanocrystalline Al6063 matrix nanocomposite powder via reactive mechanical alloying

Asgharzadeh, H ; Sharif University of Technology | 2010

2318 Viewed
  1. Type of Document: Article
  2. DOI: 10.1016/j.msea.2010.04.031
  3. Publisher: 2010
  4. Abstract:
  5. In this work, nanocrystalline Al6063 composite powder reinforced with nanometric oxide ceramic particles was synthesized via an in situ solid-gas reaction during high-energy mechanical alloying under a mixture of argon-oxygen atmosphere. The effect of oxygen volume fraction on the morphological evolution and microstructural changes during mechanical alloying was studied by various analytical techniques including optical and electron microscopy, X-ray diffraction, laser particle size analysis, apparent density measurement, and microhardness test. The reactive mechanical alloying resulted in the formation of amorphous Al- and Al-Mg-Si-Fe oxides with a size range of 40-100. nm and volume fraction up to ∼2.6. vol.% dependent on the oxygen partial pressure. Electron microscopy studies revealed formation of equiaxed grains with a wide size distribution ranging from 60 to 260. nm. Meanwhile, finer particles with narrower size distribution were achieved at a shorter milling time when the in situ solid-gas reaction was employed. Results of compression test and hardness measurement on the hot extruded powders at 450°C with an extrusion ratio of 14:1 revealed a significant improvement in the mechanical properties caused by the nanometric ceramic particles as well as the ultrafine grain structure of the matrix
  6. Keywords:
  7. Powder metallurgy ; Al-Mg-Si ; Analytical techniques ; Apparent density ; Ceramic particle ; Composite powders ; Compression tests ; Effect of oxygen ; Equiaxed grains ; Extrusion ratio ; Fe oxide ; Finer particles ; Hardness measurement ; High energy ; In-situ ; In-situ synthesis ; Laser particle size analysis ; matrix ; Microhardness tests ; Microstructural changes ; Milling time ; Morphological evolution ; Nano-structured ; Nanocomposite powder ; Nanocrystallines ; Nanometrics ; Oxide ceramics ; Oxygen atmosphere ; Oxygen partial pressure ; Reactive mechanical alloying ; Size ranges ; Solid gas reaction ; Ultrafine grain structures ; Wide size distribution ; Aluminum ; Aluminum powder metallurgy ; Amorphous silicon ; Argon ; Ceramic materials ; Compression testing ; Density measurement (optical) ; Mechanical alloying ; Mechanical properties ; Metallurgy ; Microstructure ; Nanocomposites ; Nanocrystalline powders ; Nanostructured materials ; Oxygen ; Particle reinforced composites ; Particle size analysis ; Powder metals ; Size distribution ; Synthesis (chemical) ; Titration ; X ray diffraction ; X ray diffraction analysis ; Metallic matrix composites
  8. Source: Materials Science and Engineering A ; Volume 527, Issue 18-19 , 2010 , Pages 4897-4905 ; 09215093 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0921509310004284