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Amorphization of C15 Laves RFe2 compounds by hydrogen absorption

Published online by Cambridge University Press:  11 February 2011

K. Aoki ,
M. Dilixiati  and
K. Ishikawa
K. Aoki
Affiliation:
Department of Materials Science, Faculty of Engineering, Kitami Institute of Technology, 165 Koencho, Kitami, Hokkaido 090–8507, Japan
M. Dilixiati
Affiliation:
Department of Materials Science, Faculty of Engineering, Kitami Institute of Technology, 165 Koencho, Kitami, Hokkaido 090–8507, Japan
K. Ishikawa
Affiliation:
Department of Materials Science, Faculty of Engineering, Kitami Institute of Technology, 165 Koencho, Kitami, Hokkaido 090–8507, Japan
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Abstract

C15 Laves RFe2 (R= Y, Ce, Sm, Gd, Tb, Dy, Ho and Er) compounds were thermally analyzed to elucidate conditions of hydrogen-induced amorphization (HIA), i.e. amorphization of intermetallics by hydrogen absorption, using a pressure scanning differential calorimeter (PDSC) in a hydrogen atmosphere of 1.0 MPa. As the temperature increases, hydrogen absorption in the crystalline state, HIA, precipitation of RH2 in the amorphous phase and decomposition of the remaining amorphous phase into RH2+oc-Fe occur exothermally for RFe2 (R=Y, Sm, Gd, Tb, Dy and Ho). HIA and precipitation of ErH2 occur simultaneously in ErFe2. On the contrary, hydrogen absorption of CeFe2 always leads to HIA, i.e. no hydrogen absorbed crystalline phase is formed. The mechanism of HIA in the C15 Laves phases RFe2 is discussed on the basis of the experimental results.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 753: Symposium BB – Defect Properties and Related Phenomena in Intermetallic Alloys , 2002 , BB7.8
Copyright
Copyright © Materials Research Society 2003

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References

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