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Effect of reinforcement volume fraction on the mechanical properties of Alg -SiC nanocomposites produced by mechanical alloying and consolidation

Kamrani, S ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. DOI: 10.1177/0021998309347570
  3. Publisher: 2010
  4. Abstract:
  5. Alg -(1, 3, 5, 7, 10 vol%) SiC nanocomposites were produced by mechanical alloying (MA) and double pressing/sintering route. The characteristics of the milled powders and the consolidate specimens were examined using high resolution scanning electron microscopy and X-ray diffraction method. Compression and hardness tests were used to study the effect of SiC volume fraction on the strength of Alg -SiC nanocomposites. It was shown that with increasing the SiC volume fraction, finer particles with narrower size distribution and smaller crystallite size are obtained after MA. During sintering close to the melting point of aluminum, the presence of nanometer-scaled SiC particles was found to hinder the grain growth significantly. The Al matrix with a higher SiC content exhibited more potential for grain boundary pinning, i.e., smaller grain size was obtained at higher SiC volume fractions. Consequently, an improved mechanical strength was obtained. The processing method (MA/pressing/sintering) can be used for fabrication of near-net shape Al matrix nanocomposites
  6. Keywords:
  7. Nanocomposite ; Alg-SiC ; Finer particles ; Grain size ; Hardness test ; High-resolution scanning electron microscopies ; Matrix ; Mechanical strength ; Milled powders ; Near-net shape ; Processing method ; SiC grains ; SiC particles ; X-ray diffraction method ; Crystallite size ; Grain boundaries ; Grain size and shape ; Hardness testing ; High resolution electron microscopy ; Mechanical alloying ; Mechanical properties ; Metallurgy ; Nanocomposites ; Reinforcement ; Scanning electron microscopy ; Silicon carbide ; Sintering ; Titration ; Volume fraction ; X ray powder diffraction ; Grain growth
  8. Source: Journal of Composite Materials ; Volume 44, Issue 3 , 2010 , Pages 313-326 ; 00219983 (ISSN)
  9. URL: http://journals.sagepub.com/doi/abs/10.1177/0021998309347570