Abstract
Mechanical alloying (MA) process has been introduced to produce nanocrystalline AB (TiFe) and AB2 (ZrCr2) type metal hydride. MA process has recently emerged as a novel technique for producing alloy powders whose structures are nanocrystalline and/or amorphous. Ti-Fe and Zr-Cr systems were prepared using the planetary ball mill, starting from both elemental powders and from pre-melted intermetallics. The structure of the powder after milling has been examined by XRD, TEM and HREM. Hydrogenation properties and electrochemical measurements have been investigated. Both Ti-Fe and Zr-Cr system showed a nanocrystalline structure after ball milling of both pre-melted alloy and elemental powders. The plateau pressure for hydrogenation of nanocrystalline alloy was lower than that of its conventional polycrystalline counterpart. MA Ti-Fe alloys had a higher discharge capacity than the arc-melted one. However, the discharge capacity of MA ZrCrNi alloy was lower than that of the arc-melted one.
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