Abstract
Disintegration of metal hydride powder during the repeated hydriding and dehydriding cycles has been a big problem which retards the practical application of metal hydrides. In order to solve this problem, microstructure-controlled LaNi5-Ni eutectic alloys have been studied and a promising alloy has successfully been developed. Alloys of hypo-eutectic, eutectic and hyper-eutectic compositions were melted by both arc-melting and unidirectional solidification. Resistance to disintegration of these alloys was compared with respect to the morphology of solidified structure. The results are as follows.(1) Primary melt (as arc-melted alloy) of any composite LaNi5-Ni alloys can be readily obtained by arc-melting.(2) Only the hyper-eutectic alloy among the primary melts shows high resistance to disintegration.(3) In a relatively wide range of chemical composition, desired microstructure-controlled alloys can be obtained, if unidirectional solidification is properly supplied.(4) The concentration of absorbed hydrogen decreases in the order of hypo-eutectic, eutectic and hyper-eutectic with or without unidirectional solidification. However, these values for the unidirectionally solidified alloys are much greater than those obtained for the primary melts.(5) The unidirectionally solidified eutectic and hyper-eutectic alloys showed high resistance to disintegration.(6) The differences in the concentration of absorbed hydrogen and the disintegration resistance between the primary melts and the unidirectionally solidified alloys are closely related to the morphology of solidified microstructure.
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