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Microstructure and Hydrogen Permeability of Duplex Phase M-ZrNi (M=V, Nb, Ta) Alloys

Published online by Cambridge University Press:  26 February 2011

Kazuhiro Ishikawa ,
Naoshi Kasagami ,
Tomoyuki Takano  and
Kiyoshi Aoki
Kazuhiro Ishikawa
Affiliation:
ishikazu@mail.kitami-it.ac.jp, Kitami Institute of Technology, Materials Science, 165 Koen-cho, Kitami, 090-8507, Japan
Naoshi Kasagami
Affiliation:
mm4@std.mail.kitami-it.ac.jp, Kitami Institute of Technology, Graduate student, 165 Koen-cho, Kitami, 090-8507, Japan
Tomoyuki Takano
Affiliation:
mmm4@std.mail.kitami-it.ac.jp, Kitami Institute of Technology, Graduate student, 165 Koen-cho, Kitami, 090-8507, Japan
Kiyoshi Aoki
Affiliation:
aokiky@mail.kitami-it.ac.jp, Kitami Institute of Technology, Materials Science, 165 Koen-cho, Kitami, 090-8507, Japan
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Abstract

In order to develop non-Pd based high performance hydrogen permeation alloys, microstructure, crystal structure and hydrogen permeability of duplex phase M-ZrNi (M=V and Ta) alloys were investigated using a scanning electron microscope, an X-ray diffractometer and a gas flow meter. These results were compared with those of Nb-ZrNi ones which have been previously published. The hydrogen permeation was impossible in the V-ZrNi alloys, because they were brittle in the as-cast state. On the other hand, duplex phase alloys consisting of the bcc-(Ta, Zr) solid solution and the orthorhombic ZrNi (Cmcm) intermetallic compound were formed and hydrogen permeable in the Ta-ZrNi system. The Ta40Zr30Ni30 alloy shows the highest value of hydrogen permeability of 4.1×10-8 [molH2m-1s-1Pa-0.5] at 673 K, which is three times higher than that of pure Pd.

Keywords

hydrogenationmicrostructurecompound
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II05-53
Copyright
Copyright © Materials Research Society 2007

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