Mg₂Ni intermetallic is attractive hydrogen storage materials because of their lightweight and high absorption capacity. However, the improvement of its hydriding/dehydriding kinetics is especially important. The most typical mechanical ball milling processes applied to produce nanostructured intermetallic powders from pre-alloyed cast ingots are carried out in either planetary (Fritsch) or shaker (mixer, Spex) ball mills. The movement of balls in these mills is completely uncontrolled and chaotic. This may be one reason of different results reported in that matter so far.
In the present work, the hydrogen sorption properties of nanocrystalline Mg₂Ni intermetallic prepared by mechanical (ball) milling under controlled shearing/impact mode were studied. The pre-alloyed intermetallic powders were subjected to ball milling under various controlled milling conditions such as shearing, high-energy shearing and impact in a magnetic Uni-Ball-Mill 5. The structures of milled and hydrided powders were investigated by XRD and SEM with EDS detector. The hydriding properties of the treated samples were evaluated by monitoring the absorption P-C isotherms by the conventional constant-volume method using Sieverts semi-automatic apparatus. Changes of structure during processing and hydriding properties of nanostructured Mg₂Ni intermetallic powders will be shown and discussed.

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1. Schock Wave Deformation of Intermetallic Alloys