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Effects of elastic strain energies on a hydride precipitation in LaNi5-based compounds

Published online by Cambridge University Press:  11 February 2011

K. Tanaka ,
H. Inui ,
M. Yamaguchi  and
M. Koiwa
K. Tanaka
Affiliation:
Department of Advanced Materials Science, Kagawa University, 2217–20 Hayashi-cho, Takamatsu 761–0396, Japan
H. Inui
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Yoshidahon-machi, Sakyo-ku, Kyoto 606–8501, Japan
M. Yamaguchi
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Yoshidahon-machi, Sakyo-ku, Kyoto 606–8501, Japan
M. Koiwa
Affiliation:
Department of Materials Science and Engineering, Kyoto University, Yoshidahon-machi, Sakyo-ku, Kyoto 606–8501, Japan
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Abstract

The elastic energies associated with hydride formation have been calculated using coherent elasticity theory. The energies modify the required condition for hydride nucleation to lower temperatures or higher hydrogen gas pressures. Since the elastic energies are quite large, hydride cannot form in a crystal or on a planer surface without assistance of a lattice defect. Hydride can form with reasonable excess hydrogen gas pressure only at a corner of specimen at which the most part of elastic energy is released.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 753: Symposium BB – Defect Properties and Related Phenomena in Intermetallic Alloys , 2002 , BB7.3
Copyright
Copyright © Materials Research Society 2003

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References

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