Announcement for Downloading full text filePlease respect the Copyright Act.
All digital full text dissertation and theses from this website are authorized the copyright owners. These copyrighted full-text dissertation and theses can be only used for academic, research and non-commercial purposes. Users of this website can search, read, and print for personal usage. In respect of the Copyright Act of the Republic of China, please do not reproduce, distribute, change, or edit the content of these dissertations and theses without any permission. Please do not create any work based upon a pre-existing work by reproduction, Adaptation, Distribution or other means.
URN etd-0820107-165116 Statistics This thesis had been viewed 3923 times. Download 1260 times. Author Miao-yaun Chang Author's Email Address No Public. Department Materials Engineering Year 2006 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 103 Title Synthesis of ternary and quaternary Mg-Ni-based amorphous alloys by mechanical alloying technique Keyword Vacuum hot pressing Supercooled liguid region Amorphous phase Mechancial alloying; Mechancial alloying; Amorphous phase Supercooled liguid region Vacuum hot pressing Abstract This study was to examined of Mg-based alloy powders amorphized by mechanically alloying and the feasibility of fabricating as-milled amorphous powders were then consolidated by vacuum hot pressing. The crystallization structure, microstructure and thermal stability during mechanical alloying of as-milled powders were investigated by X-ray diffraction, scanning electron microscopy and differential scanning calorimetry. After 12 hours milled, Mg40Ni5Cu35Ti20 amorphous powders exhibited a wide supercooled liquid region of 85K before crystallization. The as-milled Mg40Ni5Cu35Ti20 powders were consolidated at 280℃ for 10 minutes under a pressure of 1.2GPa by vacuum hot pressing into disc compacts with a diameter and thickness of 10 and 1mm, respectively, and its microhardness is 320 Hv. Advisor Committee Chia-jung Hu - advisor
Files Date of Defense 2007-07-26 Date of Submission 2007-08-20