Fig. 12. Schematic diagram showing the mechanism of forming the nanocomposite MgH₂/10 wt% MG-Ti₂Ni powders. (a) Optical microscope micrograph of polished MgH₂ powders obtained after 6 h of RBM. A schematic presentation showing the ball-powder-ball collision taking place during the cryo-milling process of MgH₂-10 wt% MG-Ti₂Ni powders (b), adhesion of MG-Ti₂Ni powders on the surface of MgH₂ powder particle (c), disintegration the large MgH₂ grains during the cryo milling process (d), formation of nanocomposite fine powders (e), and (f) cold rolling process of the nanocomposite MgH₂/10 wt% MG-Ti₂Ni powders. The BFI and FE-HRTEM of the bulk nanocomposite strip obtained after cold rolling are shown together in (g).