Phase structure and electrochemical properties of melt-spinning
alloy Zr(MnVNi)2.4
alloy Zr(MnVNi)2.4
(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)
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