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Analysis of the compaction behavior of Al-SiC nanocomposites using linear and non-linear compaction equations

Hafizpour, H. R ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.apt.2009.12.003
  3. Abstract:
  4. The compressibility behavior of Al-SiC nanocomposite powders was examined and the density-pressure data were analyzed by linear and non-linear compaction equations. SiC particles with an average size of 50 nm were mixed with gas-atomized aluminum powder (40 μm average size) at different volume fractions (up to 20 vol%) and compacted in a rigid die at various pressures. In order to highlight the effect of reinforcement particle size, the compressibility of micrometric SiC particles of two sizes (1 and 40 μm) was also examined. Analysis of the compressibility data indicated hindering effect of the hard ceramic particles on the plastic deformability of soft aluminum matrix, particularly at high volume fractions. More pronounced effect on the yield pressure was obtained for the nanometric particles compared with the micrometric ones. Nevertheless, better particles rearrangement was taken place when the ultrafine SiC particles were utilized. In light of the experimental and theoretical analysis, the densification mechanism of aluminum matrix composites and the effect of reinforcement particle size and volume fraction are discussed
  5. Keywords:
  6. Al-SiC ; Compaction equation ; Aluminum matrix ; Aluminum matrix composites ; Aluminum powders ; Average size ; Compaction behavior ; Deformability ; Densification mechanisms ; Hard ceramic particles ; High volume fraction ; Hindering effects ; Nanocomposite powder ; Nanometric particles ; Non-linear ; Pressure data ; Reinforcement particles ; SiC particles ; Ultrafine ; Yield pressure ; Aluminum ; Compaction ; Compressibility ; Nanocomposites ; Powders ; Pressure effects ; Reinforcement ; Silicon carbide ; Titration ; Volume fraction ; Particle size analysis
  7. Source: Advanced Powder Technology ; Volume 21, Issue 3 , 2010 , Pages 273-278 ; 09218831 (ISSN)
  8. URL: http://www.sciencedirect.com/science/article/pii/S0921883109002258