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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 2    April 2002

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Crystallization kinetics of
Zr41Ti14Cu12.5Ni10Be22.5 bulk
metallic glass
ZHANG Ke-qin(张克勤),CHEN Yan(谌  岩),GUAN Ying(关  颖),
LI Wei(李  伟),YANG Li(杨  丽),ZHANG Xiang-yi(张湘义),
ZHENG Yang-zeng(郑炀曾)

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

ISSN 1672-7029
CN 43-1423/U

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