The hydrogen storage alloy of Ti0.32Cr0.43V0.25 was prepared by arc melting and high energy ball milling. Effects of ball milling were studied for various time periods (30 - 300min) at 200rpm. The hydrogen storage capacity of the alloy decreased with the increase in milling time. The reasons for the drop in the hydrogen storage capacity are twofold: surface contamination of the alloy powder and the microstructural changes. The latter includes the increase in lattice strain, the decrease in crystallite size and the consequent increase in subgrain boundaries. Despite the microstructural changes, the BCC phase of the alloy was maintained and its lattice constant remained nearly the same. (c) 2007 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.