Synthesis and hydriding/dehydring properties of amorphous Mg2Ni1.0M0.1 alloys mechanically alloyed from Mg2Ni0.9M0.1 (M=none, Ni, Ca, La, Y, Al, Si, Cu and Mn) and Ni powder

Amorphous Mg2Ni1.9M0.1 (M=none, Ni, Ca, La, Y, Al, Si, Cu and Mn) alloys we re prepared by mechanical alloying of pseudo-binary Mg2Ni0.9M0.1 intermetal lic compounds and Ni powder. The crystal structures, thermal stabilities an d hydriding/dehydriding properties of those alloys were characterized by po wder X-ray diffraction, thermal analysis and conventional measurement of pr essure 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 d ehydriding reactions occurred at temperatures below about 400 K in both all oys. (C) 1999 Elsevier Science S.A. All rights reserved.