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Producing and Study on Properties of TiB2–TiC–Al2O3 Composite Prepared by Mechanically Activated SHS Method

Amini Rad, Sepideh | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50481 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Youzbashizadeh, Hossein
  7. Abstract:
  8. Metal matrix composites (MMCs) reinforced with ceramic particulates have been attractive as high specific strength materials utilized in automobile and aerospace industries. In order to enhance refinement and dispersibility of the ceramic particulates, the synthesis process with in-situ reactions has been investigated. The in-situ synthesis can avoid complexity and harmfulness.processes of powder handling and produce fine inclusions in the matrix with rather lower costs than conventional fabrication methods. In this study, the Al-based composites with TiC, TiB2 and Al2O3 particulates have been prepared by the by mechanically activated self-propagating high-temperature synthesis (MASHS) on reaction synthesis from starting powders of Al, TiO2 and B4C. In order to investigate the effect of TiO2 powder size on the properties of resulting composite, commercially available micron-sized TiO2 and nano-sized TiO2 powders has been considered separately in the precursor . It was found that the reactions has completed at 1200 ˚C and the temperature could be reduced when nano powder was used as the starting material. The samples containing ceramic reinforcements with nano sized TiO2 exhibited high density (2.82 g/cm3) and homogeneous microstructures with fine ceramic particulates. The mechanical properties such as hardness were improved to 326 HV when the ceramic particulates were induced by in-situ reactions, as a result of enhanced dispersion strengthening. XRD (X-ray diffraction), FESEM (Field Emission Scanning Electron Microscopy) analysis have been carried out for metallurgical characterization of the produced composite. Vickers hardness measurement and density determination have been performed to evaluate the mechanical characteristic of in-situ composite synthesized with different type powder combination at various temperature
  9. Keywords:
  10. In-Situ Synthesis ; Aluminum Matrix Composite ; Mechanically Activated Self Prepagating Reaction (MSR) ; Titanium Dioxide Nanopowder ; Ceramic Particulate

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