Effect of nickel alloying by using ball milling on the hydrogen absorptionproperties of TiFe

After ball-milling, TiFe under a pure argon atmosphere, with a small amount of pure nickel, can readily absorb large amounts of hydrogen without any a ctivation process. The H/M system reaches equilibrium after 8 h under 10 ba rs of hydrogen pressure (H/M = 0.62). Even after 10 days exposure to the ai r. the same sample reacts with hydrogen, but with slower kinetics. The impa ct of the ball-milling time on the hydrogen absorption kinetics and the max imum hydrogen content is discussed. (C) 1999 International Association for Hydrogen Energy. Published by Elsevier Science Ltd. All rights reserved.