The nanocrystal/amorphous Mg17Al12 hydrogen storage alloy was prepared by ball-milling with Mg and Al powders as raw materials.The influence of milling time on the microstructure and hydrogen storage characteristic of the alloy was investigated.The results show that the phase structure and hydrogen storage characteristic of the Mg17Al12 alloy are affected greatly by the milling time.As the milling time(t) increases the average particle size of the sample decreases first and then increases,the alloy phase st...