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Conduct an Investigation on Nanostructure of Al-20Si-5Fe Alloy, Produced by Melt Spinning Process and Observation of Mechanical-Metallurgical Properties

Azadi, Reza | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42631 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Davami, Parviz
  7. Abstract:
  8. In this study, Al-20Si-5Fe ribbons produced by melt-spinning method. Nanostructure and growth morphology of rapidly solidified products explored using optical microscope, scanning electron microscope and x-ray diffraction. Microstructural investigations depicted two distinctive zones of featureless (faceted morphology) and dendritic. In addition, no intermetallic phases could be observed in the rapidly solidified ribbons in comparison with coarsed and needle shaped intermetallic phases of as cast alloys which it demonstrates the extension of solid solubility of Si and Fe in the matrix and consequently intermetallics formation was hindered by higher cooling rates. Subsequently, ribbons annealed under the specific circumstances at the temperatures of 200, 250, 300, 350, 400, 450 ○C and afterward their structure scrutinized. In contrast, annealing heat treatment decrease the solid solubility of alloying elements such as Si and Fe in the matrix and led to the growth of Si particles, coarsening of Si and precipitation of iron intermetallic compounds in nanometric scale. Microhardness tests of heat treated ribbons- particularly at elevated temperturs- showed a tangible decrease in mechanical properties. Considerable mechanical and metallurgical properties of rapidly solidified alloys in comparison with conventional cast parts have led to the increasing fabrication and usage of this new technology
  9. Keywords:
  10. Melt Spinning ; Microstructure ; Rapid Solidification ; Hypereutectic Aluminum-Silicon-Ferrite ; Annealing Heat Treatment

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