Hostname: page-component-77c89778f8-rkxrd Total loading time: 0 Render date: 2024-07-17T08:40:04.723Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Published online by Cambridge University Press:  11 February 2011

Yumiko Nakamura  and
Etsuo Akiba
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
Get access

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
Information
MRS Online Proceedings Library (OPL) , Volume 753: Symposium BB – Defect Properties and Related Phenomena in Intermetallic Alloys , 2002 , BB5.56
Copyright
Copyright © Materials Research Society 2003

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Pitt, M. P., Gray, E. MacA., Kisi, E. H. and Hunter, B. A., J. Alloys Compd. 293–295, 118 (1999).Google Scholar
2. Nakamura, Y. and Akiba, E., J. Alloys Compd. 308, 309 (2000).Google Scholar
3. Shirai, Y., Araki, H., Mori, T., Nakamura, W. and Sakaki, K., J. Alloys Compd. 330–332, 125(2002).Google Scholar
4. Izumi, F., “Rietveld analysis program RIETAN and PREMOS and special applications” The Rietveld Method, ed. Young, R. A. (Oxford Univ. Press, 1993) pp. 236–253.Google Scholar
5. Izumi, F., The Rigaku-Denki Journal 34(1), 18 (1996) (in Japanese).Google Scholar
6. Izumi, F., http://homepage.mac.com/fujioizumi/ Google Scholar
7. Larson, A. C. and Von Dreele, R. B., “GSAS-General Structure Analysis System,” Report No. LAUR 86–748, Los Alamos National Laboratory (1994) pp. 127–138.Google Scholar
8. Kim, G., Lee, S., Lee, K., Chun, C. and Lee, J., Acta Metall. Mater. 43(6), 2233(1995).Google Scholar
9. Yamamoto, T., Inui, H. and Yamaguchi, M., Intermetallics 9, 987 (2001).Google Scholar
10. Nakamura, Y., Akiba, E., Oguro, K. and Uehara, I., J. Alloys Compd. 298, 138 (2000).Google Scholar
11. Sakaki, K., Araki, H. and Shirai, Y., Abstracts of spring meeting the Japan Institute of Metals, (2002) p. 488 (in Japanese).Google Scholar