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Pressure hysteresis in the TiMn1.5Vx-H2 (x = 0.1–0.5) system

Published online by Cambridge University Press:  31 January 2011

Yongtao Li ,
Shiyou Zheng ,
Fang Fang ,
Hanping Zhang ,
Qingan Zhang  and
Dalin Sun
Hanping Zhang
Affiliation:
Department of Materials Science, Fudan University, Shanghai 200433, People's Republic of China
Qingan Zhang
Affiliation:
School of Materials Science and Engineering, Anhui University of Technology, Maanshan, Anhui 243002, People's Republic of China
Dalin Sun*
Affiliation:
Department of Materials Science, Fudan University, Shanghai 200433, People's Republic of China
*
a) Address all correspondence to this author. e-mail: dlsun@fudan.edu.cn
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Abstract

The structural characteristics of TiMn1.5Vx (x = 0.1–0.5) alloys and the hysteresis phenomenon in the TiMn1.5Vx-H2 system have been studied. The TiMn1.5Vx alloy consists mainly of the C14 Laves phase plus some of the BCC solid solution phase, depending on x. The lattice parameters of the C14 Laves phase increase slightly as x increases from 0.1 to 0.2 but are invariant with a further increase in x up to 0.3–0.5. The pressure-composition isotherms clearly show a pressure hysteresis in the TiMn1.5Vx-H2 system which decreases with an increase in the x value mainly due to the equilibrium pressure change for hydride formation. The free energy loss during hydride formation is related to not only the volume expansion, but also the elastic strain in the TiMn1.5Vx alloy itself, that is, prior to hydrogen absorption.

Keywords

AlloyEnergy storageX-ray diffraction (XRD)
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 9 , September 2009 , pp. 2886 - 2891
Copyright
Copyright © Materials Research Society 2009

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