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Rostami, Abbas | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46029 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Sadrnezhad, Khatiboleslam
  7. Abstract:
  8. Due to the ability in producing nanostructured materials, Mechanical Alloying has gained outstanding position in comparison with other materials fabrication techniques. In this research,with different milling condition, Alloying of Ni-Ti-Ag was performed. In order tofabricating the alloy, twodifferent initial materials were employed.In one process, nickel, titanium and silver were used as raw materials, and in another, titanium hydride was used instead of titanium.Initial powders were investigated in planetary mill, SPEX mill and vibratory disc indifferent times. Using XRD, microstructure information and phase analysis was obtained. EDS was employed for determination of elemental distribution and impurity detection. Results of planetary mill indicated that a nanostructured-amorphous Ni-Ti Alloy withNiTi B2 phase was produced. In addition, results from SEM show formation of nanometric powders. However results of SPEX mill,during the time of milling didn’t represent production of NiTi or amorphous phase but microstructure was reduced .By milling in vibratory disc mill within 3h, NiTi alloy was produced. Results of using titanium hydride don’t indicate formation of NiTi or amorphous phase. heat treatment was performed on the Prepared powders, or the powders initially pressed in the form of samplesand then sintered. Results indicated that nickel contentdecreasedwhenmillingtimeincreased and after heat treatment NiTi,NiTi2, Ni3Ti and Ni phases was formed.Although titanium hydride gave different results after milling but after heat treatment similar products was obtained
  9. Keywords:
  10. Mechanical Alloying ; Nanostructure ; Heat Treatment ; Amorphous Alloys ; Nickel-Titanium-Silver Nanostructure

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