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Mg2Ni0.8Cro.2-x wt.% CoO/Al2o3 (x=0.5, 1, 2 and 3) composites were prepared by mechanically milling sintered Mg2Ni0.8Cr0.2 alloy and CoO/Al2O3 compound for 45 h, The addition of CoO/Al2O3 compound resulted in the good kinetics properties of hydriding/dehy