Crystallization behavior and hydrogen storage kinetics of amorphous Mg11Y2Ni2 alloy

► The amorphous Mg11Y2Ni2 alloy undergoes two crystallization steps. ► The crystalline Mg11Y2Ni2 is formed as a metastable phase at first step. ► The stable alloy consists of Mg, YMgNi4 and (Y, Mg) solid solution. ► The amorphous and metastable alloys have almost same hydrogen storage kinetics. ► The stable alloy has slightly slower hydrogen storage kinetics.