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URN etd-0821106-174803 Statistics This thesis had been viewed 2677 times. Download 1005 times. Author Tse-yu Chen Author's Email Address No Public. Department Materials Engineering Year 2005 Semester 2 Degree Master Type of Document Master's Thesis Language English Page Count 107 Title Synthesis of ternary and quaternary Mg-Cu-based amorphous alloys by mechanical alloying technique Keyword GFA Mg-Cu-based alloys Mechanical alloying Amorphous phase Supercooled liquid region Supercooled liquid region Amorphous phase Mechanical alloying Mg-Cu-based alloys GFA Abstract This study examined the amorphization feasibility of Mg-Cu-based alloy powders synthesized by mechanical alloying technique with a high energy SPEX 8000-D ball mixer. The microstructural evolution and phase stabilities during mechanical alloying of the mixed powders were investigated by X-ray diffraction and scanning electron microscopy and differential scanning calorimeter. Several amorphous powders were found to exhibit a wide supercooled liquid region , ie ΔT(ΔT=Tx-Tg), is 55K for Mg40Cu40Ti20, 53K for Mg40Cu35Ti25, 51K for Mg40Cu35Ti23B2, 62K for Mg40Cu35Ti21Sn4, and 74K for Mg40Cu35Ti21Ni5. As the results demonstrated, small addition of Sn and Ni significantly improved the glass forming ability (GFA) of the Mg-Cu-Ti amorphous alloy. Advisor Committee Chia-Jung Hu - advisor
Hsin-Ming Wu - co-chair
Pee-Yew Lee - co-chair
Files Date of Defense 2006-07-17 Date of Submission 2006-08-21