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Title page for etd-0823110-130501


URN etd-0823110-130501 Statistics This thesis had been viewed 1335 times. Download 0 times.
Author Wel-Lun Chiang
Author's Email Address No Public.
Department Materials Engineering
Year 2009 Semester 2
Degree Master Type of Document Master's Thesis
Language zh-TW.Big5 Chinese Page Count 77
Title Synthesis of Mg-based amorphous composites by mechanical alloying technique
Keyword
  • Mg-based
  • Amorphous phase
  • Mechancial alloying
  • Mechancial alloying
  • Amorphous phase
  • Mg-based
  • Abstract This study examined the amorphization behavior of Mg-based alloy powders synthesized by mechanically alloying and the feasibility of consolidation by vacuum hot pressing. The crystallization structure, microstructure and thermal stability during mechanical alloying of as-milled powder were investigated by X-ray diffraction, scanning electron microscopy and differential scanning calorimetry, respectively. After 11-hour milling, Mg-Cu-Ni system amorphous powders exhibited a wide supercooled liquid region of 43K before crystallization. As the results demonstrated, the small addition of Ni improved the glass forming ability(GFA) of Mg-based amorphous alloys, which is better then the small addition of Ti. The as-milled(Mg65Cu35)92Ni8 powders were consolidated at 260℃ under a pressure of 1.2GPa by hot pressing into disc compacts with a diameter and thickness of 10 and 1 mm, respectively. Its microhardness and porosity percentage are 431Hv and 2.35%, respectively. With increasing the isothermaltime, the density and microhardness of these alloys decrease.
    Advisor Committee
  • Chia-Jung Hu - advisor
  • Hsin-Ming Wu - co-chair
  • Pee-Yew Lee - co-chair
  • Files indicate not accessible
    Date of Defense 2010-07-27 Date of Submission 2010-08-24


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