Journal
MATERIALS TRANSACTIONS
Volume 43, Issue 7, Pages 1732-1736Publisher
JAPAN INST METALS
DOI: 10.2320/matertrans.43.1732
Keywords
hydrogen-storage material; magnesium-nickel-neodymium alloy; melt-spinning; crystallization; multiphase microstructure; hydriding/dehydriding kinetics; pressure-composition isotherm; secondary-electron microscopy
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The hydriding/dehydriding characteristics, pressure-composition isotherms and X-ray diffractographs of Mg-rich Mg-Ni-Nd alloys fabricated by different solidifying processes (mold-casting, water-quenching, or melt-spinning) are compared and discussed in relation with their microstructures observed by SEM. Among them, the alloy prepared by melt-spinning and subsequent annealing presents best hydrogen-storage properties. It can quickly absorb hydrogen up to similar to5.0 mass% above 423 K and can wholly desorb it above 453 K with moderate speeds. These enhanced absorption/desorption kinetics are exclusively caused by a refined microstructure of the alloy involving Mg2Ni and Nd2H5 precipitates in a Mg matrix as well as by a catalytic action of the Nd-hydride.
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