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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 4    August 2003

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Phase structure and electrochemical properties of melt-spinning
alloy Zr(MnVNi)2.4
ZHANG Shu-kai(张书凯)1, SHU Kang-ying(舒康颖)1,
LEI Yong-quan(雷永泉)2, LV Guang-lei(吕光烈)3
WANG Qi-dong(王启东)2

1. Department of Materials Science and Engineering,
Zhejiang University, Hangzhou 310027, China;
2. Ningbo Yunsheng Magnetic Material and Engineering Research Institute, Yunsheng Group, Ningbo 315041, China;
3. Central Laboratory, Zhejiang University, Hangzhou 310028, China

Abstract:Zr(Mn0.2V0.2Ni0.6)2.4 alloy was prepared by using both arc-melting and melt-spinning processes. The XRD results indicate that the as-cast alloy contains two Laves phases, C14(15.45%) and C15(76.48%), and the non-Laves phase Zr7M10(8.07%, M presents Ni, Mn, V). Meanwhile the melt-spun alloy only has the C14(27.67%)and C15(69.43%) Laves phases. The electrochemical test indicates that the melt-spun alloy has much better cycling stability (S500=90.8%), higher discharge capacity (Cmax=347.5mA·h·g-1) than those of as-cast alloy(S500=80.9%, Cmax=340.8mA·h·g-1), although its activation property and high-rate-dischargeability decrease somewhat. The different electrochemical properties between the melt-spun and as-cast alloys are resulted from the different phase composition, phase abundance and microstructure.

 

Key words: AB2 type alloys; melt-spun; over-stoichiometry; electrochemical properties; microstructure

ISSN 1672-7029
CN 43-1423/U

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