EFFECTS OF MECHANICAL ALLOYING ON THE HYDROGEN STORAGE CHARACTERISTICS OF MG-XWT-PERCENT NI (X=0, 5, 10, 25 AND 55) MIXTURES

Magnesium is alloyed mechanically with nickel in a planetary mill. Mag nesium without nickel is also treated under the same conditions. The h ydriding and dehydriding properties of these materials are investigate d. The Mg2Ni phase develops in the mechanically alloyed Mg-xwt % Ni (x = 5, 10, 25 and 55) mixtures along with hydriding-dehydriding cycles. The principal effects of mechanical alloying and hydriding-dehydridin g cycling are the augmentation in the active nucleation sites and the decrease in the effective particle size. The effects of mechanical all oying and hydriding-dehydriding cycling on the hydriding and dehydridi ng reactions of Mg in the mixtures are most important in Mg-25wt % Ni under our experimental conditions.