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An Investigation on Mechanical Properties of Mg-CNT Composites Produced using the Casting Process

Mousavi Nezhad, Hadi | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48548 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Karimi Taheri, Ali
  7. Abstract:
  8. Since the discovery of nanomaterials, the nanotubes have found special considerations. The high strength beside the low density, have attracted the interest of the scientists and engineers. Nowadays, one of the common methods to produce composites with high specific strength is to utilize of the nanotubes in the matrix of lightweight metals and alloys such as magnesium and aluminum. Recent researches indicate that very limited focus has been given to the production and properties of the magnesium - carbon nanotube composites and their workability. In this research, magnesium alloy - carbon nanotube composite is produced by casting method and its strength and workability are investigated as the most effective parameters. In the experiment, tensile, hardness and rolling tests are used.After preparation of the composite samples, the microstructure of the samples were examined using the optical microscope (OM) and scanning electron microscope (SEM). Tensile tests carried out on the the sample containing 1 wt% of carbon nanotube showed a 46% increase in strength. The improvement of mechanical properties was attributed to the effect of nanotube on grain refinement and wettability of nanotube by the molten alloy. Fracture strain of the composite was increased about 42% by the homogenization heat treatment. Workability test showed that the composite samples containing 1% carbon nanotube reach the highest workability among all types of the composites. Present research, suggest the casting method under the gas atmosphere as an optimal method for production of magnesium alloy - carbon nanotube composite
  9. Keywords:
  10. Composite ; Magnesium ; Carbon Nanotubes ; Casting ; Mechanical Properties ; Microstructure ; Workability

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