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

Yumiko Nakamura, Etsuo Akiba

Research output: Contribution to journalConference article

4 Citations (Scopus)

Abstract

Defects formation in LaNis-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.

Original languageEnglish
Pages (from-to)463-468
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume753
Publication statusPublished - Nov 11 2003
EventDefect Properties and Related Phenomena in Intermetallic Alloys - Boston, MA, United States
Duration: Dec 3 2002Dec 5 2002

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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