Transactions of Nonferrous Metals Society of China
JOURNAL OF RAILWAY SCIENCE AND ENGINEERING
|Vol. 12 No. 2 April 2002|
（Institute of Materials Science and Chemical Engineering,
Yanshan University, Qinhuangdao 066004，China）
Abstract:The crystallization kinetics of Zr41Ti14Cu12.5Ni10Be22.5 bulk metallic glass has been studied by using DSC and XRD. The results show that two exothermal peaks are observed when the alloy is heated to 500℃, one peak results dominantly from the formation of Ti2Ni (α phase transition ), the other peak is mainly due to the formation of Zr2Cu (β phase transition). At the beginning of the crystallization, the activation energy of the α phase is smaller, and it increases with increasing crystallized fraction (xc). When xc increases to 90%, the crystallization activation energy shows the largest value (220kJ/mol). The crystallization activation energy of the β phase remains about 227kJ/mol, as it's crystallized fraction is below 60%, and then it increases with increasing crystallized fraction, and shows the largest activation energy of 257kJ/mol, as the xc is 65%.
Key words: bulk metallic glass; Zr41Ti14Cu12.5Ni10Be22.5 alloy; crystallization kinetics; activation energy