Hydriding reactions induced by ball milling

Hydriding reactions between metal powders (Ti, Zr and Mg) have been realised by ball milling at room temperature. Metal-hydrides (TiH1.9, ZrH1.66 and MgH2) were obtained at short milling times. The milling process was monitored using H-2 pressure measurement. The sharp decrease of H-2 pressure during milling indicates high rates of H-2 absorption and hydriding reactions. Decomposition of the so-formed metal-hydrides has been observed during thermal analysis. Results indicate that pulverisation and deformation processes occurring during high-energy ball impacts play a major role in the hydriding reaction.