Abstract
Disintegration of metal hydride powder due to repeated hydriding and dehydriding cycles has been a serious problem which has retarded the practical application of metal hydrides. In order to solve this problem, unidirectional solidification was applied to LaNi 5Ni eutectic alloys of chemical compositions ranging from hypoeutectic to hypereutectic. Examination of the disintegration resistance and hydriding characteristics revealed that these unidirectionally solidified alloys possess better resistance to disintegration than the as-arc-melted alloys of similar compositions after 30 cycles of hydriding and dehydriding. Disintegration resistance is enhanced as the amount of ductile nickel phase increases because the development of microcracks is arrested and the volume expansion is relaxed by the nickel phase. These LaNi 5Ni alloys had higher equilibrium pressures and lower hydrogen concentrations compared with those of LaNi 5 powder. The results obtained are discussed in terms of the effects of lattice strain in hydrided LaNi 5 and the amount of LaNi 5.
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