Melt spinning(MS)and ball milling(BM)were employed to fabricate YMg_(11)Ni alloy,and their structures and hydrogen storage performances were examined.The results reveal that the as-spun and as-milled alloys both exhibit the nanocrystalline and amorphous structure.The as-milled alloy shows a larger hydrogen absorption capacity as compared with the as-spun alloy.More than that,the as-milled alloy exhibits lower onset hydrogen desorption temperature than the as-spun one,which are 549.8 and 560.9 K,respectively.Additionally,the as-milled alloy shows a superior hydrogen desorption property to the as-spun one.On the basis of the time needed by desorbing hydrogen of 3 wt%H_2,for the asmilled alloy,it needs 1106,456,343,and 180 s corresponding to hydrogen desorption temperatures of 593,613,633,and653 K.However,for the as-spun alloy,the time needed is greater than 2928,842,356,and 197 s corresponding to the same temperatures.Hydrogen desorption activation energies of as-milled and as-spun alloys are 98.01 and 105.49 k J/mol,respectively,which is responsible for that the as-milled alloy possesses a much faster dehydriding rate.By means of the measurement of pressure–composition–temperature(P–C–T)curves,the dehydrogenation enthalpy change of the alloys prepared by MS(DH_(de)(MS))and BM(DH_(de)(BM))is 81.84 and 79.46 k J/mol,respectively,viz.DH_(de)(MS)[DH_(de)(BM). Melt spinning (MS) and ball milling (BM) were employed to fabricate YMg_ (11) Ni alloy, and their structures and hydrogen storage performances were examined. The results reveal that the as-spun and as-milled alloys both exhibit the nanocrystalline and amorphous structure. The as-milled alloy shows a larger hydrogen absorption capacity as compared to the as-spun alloy. More than that, the as-milled alloy exhibits lower onset hydrogen desorption temperature than the as-spun one, which are 549.8 and 560.9 K, respectively. Additionally, the as-milled alloy shows a superior hydrogen desorption property to the as-spun one. On the basis of the time needed by desorbing hydrogen of 3 wt% H 2, for the asmilled alloy, it needs 1106, 456, 343 , and 180 s corresponding to hydrogen desorption temperatures of 593,613,633, and 653 K. Howl for the as-spun alloy, the time needed is greater than 2928,842,356, and 197 s corresponding to the same temperatures. Hydrogen desorption activation energies of as- milled and as-spun alloy s are 98.01 and 105.49 k J / mol, respectively, which is responsible for that as-milled alloy possesses a much faster dehydriding rate.By means of the measurement of pressure-composition-temperature (P-C-T) curves, the dehydrogenation enthalpy change of the alloys prepared by MS (DH_ (de) (MS)) and BM (DH_ (de) (BM)) is 81.84 and 79.46 kJ / mol, respectively, viz.DH_ (de) DH_ (de) (BM).