Title page for etd-0904112-190600


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URN etd-0904112-190600
Author Wei-jau Lin
Author's Email Address No Public.
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Department Materials and Optoelectronic Science
Year 2011
Semester 2
Degree Master
Type of Document
Language English
Title Fabrication and characterization of metallic glass foams by dealloying method
Date of Defense 2012-07-24
Page Count 112
Keyword
  • porous
  • co-sputtering
  • electrochemiscal
  • dealloying
  • metallic glass
  • Abstract The processing and characterization of thin film metallic glasses (TFMGs) and bulk metallic glass foams (BMGFs), prepared by the dealloying corrosion process, have been studied. The TFMGs were fabricated by the co-sputtering with the Zr65Cu25Ti10 (wt%) alloy target and the pure Ta target. For BMG, there are two kinds of amorphous metallic powders adopted, namely, Zr53Cu30Ni9Al8, and Ti40Cu36Pd14Zr10. The Zr- and Ti-based powders were sintered at the temperature that Zr- and Ti-based powders overlap their supercooled regions. To fabricate the porous structure, these materials were selectively dissolved using electrochemical treatments in 0.1 M HNO3 solution. The glassy nature and the pore morphology of the corroded materials were confirmed by X-ray diffraction and scanning electron microscopy. In the current study, the pore size is about 10-30 μm and the porosity volume faction is about 43%. By using different combinations of the powders size and volume fraction, the resulting pore size and porosity fraction can be upgraded to 200-500 μm and 60-80%, respectively.
    Advisory Committee
  • Chehsin Lin - chair
  • Chung-Hwan Chen - co-chair
  • J. C. Huang - advisor
  • Files
  • etd-0904112-190600.pdf
  • Indicate in-campus at 0 year and off-campus access at 1 year.
    Date of Submission 2012-09-04

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