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Advances in Materials Science and Engineering
Volume 2015, Article ID 504207, 6 pages
Research Article

The Effect of Stoichiometry on Hydrogen Embrittlement of Ordered Ni3Fe Intermetallics

1Laboratory for Microstructure, Shanghai University, Shanghai 200072, China
2Institute of Materials Science, Shanghai University, Shanghai 200072, China

Received 23 October 2014; Revised 14 January 2015; Accepted 16 January 2015

Academic Editor: Jianfei F. Sun

Copyright © 2015 Y. X. Chen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The effects of Fe stoichiometry on hydrogen embrittlement and hydrogen diffusion in ordered Ni3Fe intermetallics were investigated. The experimental results show that the ordered Ni3Fe alloy with the normal stoichiometry has the lowest mechanical property, the highest susceptibility to hydrogen, and the highest ability of catalytic reaction. The mechanical properties, the susceptibility to hydrogen embrittlement, and the amount of adsorbed hydrogen of the ordered Ni3Fe alloy are dependent of degree of order of the alloy. The apparent hydrogen diffusion coefficient of the ordered Ni3Fe alloy is independent on degree of order of the alloy but depends on Fe stoichiometry. The activation energy of hydrogen diffusion decreased linearly with Fe stoichiometry for the ordered Ni3Fe alloy.