HYDRIDING PROPERTIES OF MECHANICAL ALLOYS MG-NI

The rapid reaction of Mg-Ni mechanical alloys with hydrogen during initial hydriding is accounted for by the formation of a large interface between the metallic phases upon mechanical alloying, the chemical changes of the alloy surface associated with the electron transfer (from magnesium to nickel) and the reaction between magnesium and nickel. It is shown that the formation of Mg//2Ni during the hydriding-dehydriding of the mechanical alloys proceeds mainly according to the reaction 2MgH//2 plus Ni yields Mg//2Ni plus 2H//2.