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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.43  No.11 (2002)  >  pp.2703-2705

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Effect of Surface Modification by Ion Implantation on Hydrogenation Property of TiFe Alloy

Takanori Suda1), Masaki Ohkawa1), Shougo Sawada1), Seiichi Watanabe1), Somei Ohnuki1) and Shinji Nagata2)
1) Department of Materials Science, Faculty of Engineering, Hokkaido University
2) Institutes for Materials Research, Tohoku University

In order to improve initial activation properties of TiFe alloy, simple ion implantation and ion mixing with the deposition of LaNi5 were carried out at room temperature. The results show that argon-ion mixing caused extensive improvement of initial activation, wherein hydrogenation was easily effected at 373 K and 1 MPa. Those results are related to several irradiation effects; the re-crystallization of amorphous film of LaNi5 and the local segregation of composed elements. Both of these irradiation effects greatly improve the initial hydrogenation process of TiFe alloy.

hydrogen storage alloy, ion implantation, ion mixing, surface modification, TiFe alloy, activation

Received: May 20, 2002
Accepted: October 10, 2002 , Published online: September 06, 2005
Copyright (c) 2005 The Japan Institute of Metals



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