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Amorphous Mg 2 Ni 1.9 M 0 1 (M=none, Ni, Ca, La, Y, Al, Si, Cu and Mn) alloys were prepared by mechanical alloying of pseudo-binary Mg 2 Ni 0 ,9M0 1 intermetallic compounds and Ni powder. The crystal structures, thermal stabilities and hydriding/dehydriding properties of those alloys were characterized by powder X-ray diffraction, thermal analysis and conventional measurement of pressure composition isotherms. In spite of the difference in M element, all specimens formed amorphous structures by mechanical alloying. Owing to the substitution of Ca the amount of desorbed hydrogen increased from 1.8 mass% for M=none to 2.1 mass% for M=Ca by measurement of thermogravimetry. The dehydriding reactions occurred at temperatures below about 400 K in both alloys. |
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