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Production of Zirconium based Amorphous Alloy by Mechanical Alloying and Sintering Al-based Composite with Amorphous Particles

Karami, Soleyman | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52187 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Pourazarang, Kazem; Abachi, Parvin
  7. Abstract:
  8. Production of copper-zirconium amorphous alloys by mechanical alloying and the process of changing crystal structure to amorphous, was examined. The amount of progress of amorphization has been checked by x-ray analysis after different hours of milling. By increasing the percentage of zirconium in this type of alloy, the process of amorphization has been improved. But There is a limiting factor which is due to the tendency of zirconium to produce oxide and nitride phase. Also, the effect of excessive elements on crystal structure changing has been checked. Hence, adding elements like nickel or aluminum has a different effect on the process of amorphization. adding aluminum to the system would improve the ability of phase transfomation due to reducing the time of milling.At the end by checking the thermal stability of alloy and defining the glassy and crystallization temperature, we were able to produce Al-based composite with amorphous paticles by spark plasma sintering. Composite with 33.4 weight percent of aluminum and 66.6 weight percent of amorphous particles have been produced by this method. These samples have significant mechanical behavior, in contrast to composites reinforced with ceramic particles. This happened Because of adhesion between aluminium and amorphous particles. As a result of high strength amorphous particles and interface bonding improvement, mechanical behavior of composites have improved. Structural analysis with scanning electron microscopy approved good adhesion of the amorphous phase with aluminum
  9. Keywords:
  10. Zirconium ; Spark Plasma Sintering ; Mechanical Alloying ; Zirconium-Copper Alloy ; Aluminum Matrix Composite ; Amorphous Alloys

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