SYNTHESIS OF CU-BASED AMORPHOUS ALLOYS WITH 10% ZIRCONIUM

• Main Authors: Hung-Cheng Kang, 康宏誠
• Other Authors: Chia-Jung Hu
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/35913556405397586922

碩士 === 大同大學 === 材料工程學系(所) === 101 === This study is examined the amorphization behavior of the Cu-Ti-Zr-based alloy powders with 10 at% Zr (99.0 at% purity) synthesized by mechanical alloying technique. The compositions of the alloys were near the eutectic compositions in the Cu-Ti-Zr ternary phase diagram by CALPHAD technique. As the results demonstrated , the ternary Cu-Ti-Zr alloys of compositions ranging from Cu-50-80 at% , Ti-10-40 at% and 10 at% Zr were not found to exhibit a glass transition temperature(Tg). By addition of silicon to the Cu60Ti30Zr10 system , some amorphous powders were found to exhibit a wide supercooled liquid region before crystallization. The temperature interval of the supercooled liquid region (ΔTx) and the activation energy of crystallization (Ec) are 76K , 221.7 kJ/mole for （Cu60Ti30Zr10）99Si1 and 84.7K , 237.8 kJ/mole for （Cu60Ti30Zr10）97Si3 , respectively . Finally , small additions of Si significantly improved the glass forming ability of the Cu-Ti-Zr-based amorphous alloys.