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.
|ジャーナル||Materials Research Society Symposium - Proceedings|
|出版ステータス||出版済み - 11 11 2003|
|イベント||Defect Properties and Related Phenomena in Intermetallic Alloys - Boston, MA, 米国|
継続期間: 12 3 2002 → 12 5 2002
All Science Journal Classification (ASJC) codes