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Study of Microstructure and Hot Deformation Behavior of Aluminum Nanocomposites Reinforced with SiC Nanoparticles

Mobarhan Bonab, Mohammad Ali | 2015

2011 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47055 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Simchi, Abdolreza
  7. Abstract:
  8. Hot deformation behavior of Al-SiC nanocomposites was investigated in this study. Aluminum powders with mean size of 60 micron and SiC nanopowders (mean size of 45nm) in amounts of 1 and 2 volume percents, as reinforced part, were mixed and milled for 40 hours by planetary ball mill. After degassing at 450 oC for 1 hour, milled powders were pressed into Aluminum cans (in Argon atmosphere) and then hot extruded. Extrusion ratio was 1:14. High density billets (with 98% of theoretical density) were produced because of that high extrusion ratio. TEM microstructure studies showed that fine distribution of reinforcements and Aluminum Oxides obtained via this procedure. Hardness and Uniaxial pressure tests at room temperature and also hot compression tests at temperatures between 350-500 oC and strain rates of 0/5, 0/05, 0/005 were performed. Examinations showed that when Aluminum grains become less than 100 nm in size and reinforced nanoparticles are added to the Aluminum matrix, mechanical properties both at room and elevated temperatures are enhanced obviously. A 43% increase in activation energy (101 to 178 ,in comparison with coarse grained Aluminum) was obtained by adding 1 and 2 vol% of SiC particles. Dynamic Recovery was asserted as dominant high temperature mechanism
  9. Keywords:
  10. Nanocomposite ; Aluminum ; Silicon ; Hot Compression ; Ultra Fine Grain Structure ; Aluminum-Silicon Alloy

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