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Defects Formation in LaNi5-based Alloys Investigated by In-situ X-ray Diffraction

Published online by Cambridge University Press:  11 February 2011

Yumiko Nakamura
Affiliation:
National Institute of Advanced Industrial Science and Technology (AIST), AIST Central-5, 1–1–1, Higashi, Tsukuba, Ibaraki, 305–8565, Japan
Etsuo Akiba
Affiliation:
National Institute of Advanced Industrial Science and Technology (AIST), AIST Central-5, 1–1–1, Higashi, Tsukuba, Ibaraki, 305–8565, Japan
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Abstract

Defects formation in LaNi5-based alloys was investigated by X-ray diffraction (XRD). In-situ XRD data measured along the first hydriding-dehydriding P-C isotherms were analyzed by the Rietveld method. Lattice strain and crystallite size were evaluated from the peak profile. In LaNi5 hydride phase formed accompanying with 2 % of anisotropic lattice strain in <hk0> direction caused by dense dislocations. Coexisting solid solution phase was not affected by the strain in the hydride phase. Lattice parameter a became smaller after cycles than before hydriding, which is related with vacancies formation.

Only 5 % of Al substitution for Ni dramatically changed the defects formation behavior. Hydride phase did not show lattice strain in the first hydriding but showed small strain during dehydriding. Formation of both dislocations and vacancies are strongly affected by substitution of other elements for a part of Ni.

Type
Research Article
Copyright
Copyright © Materials Research Society 2003

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References

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