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The hydrogen storage alloy (Mg2Ni)100xTix (x  0, 2.5, 5.0, 7.5 and 10.0 at%) powders were synthesized from elemental powder mixture by mechanical alloying (MA) under an Ar atmosphere. The as-milled powders were examined as a function of titanium addition by X-ray diffraction and synchrotron X-ray absorption near-edge structure (XANES) techniques at various milling time. The hydrogen absorption kinetics of the 15 h as-milled powders were evaluated. The maximum hydrogen absorption content of 15 h as-milled Mg2Ni powders can be improved from 3.14mass % to 3.88mass % when 5.0 at % of titanium was added. The hydrogenation rate of the Mg2Ni powder was also obviously enhanced by introducing the titanium into Mg2Ni lattices. More than 20 % improvement of hydrogen absorption for Mg2Ni intermetallic powders was achieved by adding titanium. [doi:10.2320/matertrans.MER2007169

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Hydrogen Absorption Performance of Mechanically Alloyed (Mg&lt;SUB&gt;2&lt;/SUB&gt;Ni)&lt;SUB&gt;100&amp;minus;&lt;I&gt;x&lt;/I&gt;&lt;/SUB&gt;Ti&lt;I&gt;&lt;SUB&gt;x&lt;/SUB&gt;&lt;/I&gt; Powder