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Microstructural evolution of body-centered cubic structure related Ti–Zr–Ni phases in non-stoichiometric Zr-based Zr–Ti–Mn–V–Ni hydride electrode alloys

Published online by Cambridge University Press:  31 January 2011

Xueyan Song ,
Yun Chen ,
Cesar Sequeira ,
Yongquan Lei ,
Qidong Wang  and
Ze Zhang
Xueyan Song*
Affiliation:
Department of Materials Science and Engineering, Zhejiang University, People's Republic of China; Beijing Laboratory of Electron Microscopy, Chinese Academy of Sciences, Beijing, People's Republic of China, and Applied Superconductivity Center, University of Wisconsin-Madison, Madison, Wisconsin 53706
Yun Chen
Affiliation:
Department of Materials Science and Engineering, Zhejiang University, People's Republic of China, and Department of Chemical Engineering, Instituto Superior Tecnico, Lisbon, Portugal
Cesar Sequeira
Affiliation:
Department of Chemical Engineering, Instituto Superior Tecnico, Lisbon, Portugal
Yongquan Lei
Affiliation:
Department of Materials Science and Engineering, Zhejiang University, People's Republic of China
Qidong Wang
Affiliation:
Department of Materials Science and Engineering, Zhejiang University, People's Republic of China
Ze Zhang
Affiliation:
Beijing Laboratory of Electron Microscopy, Chinese Academy of Sciences, Beijing, People's Republic of China
*
a) Address all correspondence to this author. Applied Superconductivity Center, University of Wisconsin-Madison, 1500 Engineering Drive, 927 ERB, Madison, Wisconsin, 53706. e-mail: xsong@facstaff.wisc.edu
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Abstract

Non-stoichiometric Zr-based alloys were prepared, and the corresponding electrochemical properties were characterized as hydride electrode alloys. The microstructure and chemical composition of non-stoichiometric Zr–Ti–Mn–V–Ni hydride electrode alloys were systematically investigated by x-ray Rietveld refinement, transmission electron microscopy (TEM), and energy dispersive spectroscopy under TEM observation. C14, C15 Laves phases and non-Laves phases were identified in Zr1−xTix(MnVNi)2.2 (x = 0, 0.2, 0.3, 0.4) alloys. Non-Laves phases in Zr1-xTix(MnVNi)2.2 (x = 0, 0.2, 0.3, 0.4) alloys are Ti–Zr–Ni phases related to the TiNi phase with pseudo-body-centered-cubic structure of the CsCl type. The evolution of crystallography and phase constitution for Ti–Zr–Ni non-Laves phases with different alloy composition was systematically studied. The influence of the Ti–Zr–Ni phases on the electrochemical properties of non-stoichiometric Zr1−xTix(MnVNi)2.2 alloys is briefly discussed.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 1 , January 2003 , pp. 37 - 44
Copyright
Copyright © Materials Research Society 2003

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