Nanocrystalline TiFe alloys with different morphology and microstructure were synthesized by mechanical alloying from the elemental powders with varied milling time. The particle morphology distinctly changes from globular to slaty between the 10th and 15th h of milling and then becomes spherical again after 30 h. The average particle size decreases continuously with milling time from about 50 mu m (10 h milling) to 1-2 mu m for the 30 h milled sample. X-ray diffraction analysis showed that after 15 h of milling alloying has already started. The initial mixture of metal powders transformed into amorphous or fine nanocrystalline material after 20 h. Further milling did not change the microstructure noticeably, i.e. it remaied nanocrystalline with some amount of amorphous fraction. Nanocrystalline Fe was also present in the end product. DTA analysis displayed exothermic effects due to crystallization reactions, revealing that the end product also contains the amorphous phase. Electrochemical hydrogen charge/discharge measurements of the as-milled alloys were carried out under galvanostatic conditions. It was found that with increased milling time the discharge capacity increased and reached a value of 230 mAh g(-1) for the 30 h milled sample, which is a substantially higher value than those published for this alloy composition. The cycle life of the alloy with the finest nanostructure is, however, shorter compared to the coarser nanostructures.