Effects of boron and carbon on the hydrogenation properties of TiFe and Ti1.1Fe

In an attempt to enhance the resistance of TiFe to disintegration during hy drogenation, a small addition of boron or carbon to the alloy was made. The hydrogenation properties of these ternary alloys were studied and compared with those of TiFe. For TiFeB0.001, Ti1.1FeB0.001, TiFeC0.001 and Ti1.1FeC o0.001 alloys, addition of B or carbon induced the formation of Ti and TiFe 2 but did not improve the disintegration resistance; Boron and carbon appea red to suppress the formation of the TiFeH2 phase. The absorption capacitie s were drastically reduced. The plateaus became more inclined and the press ures were higher than that of TiFe. The change of hydrogenation properties is explained based on the presence of Ti and TiFe2 and the interaction betw een B or carbon and hydrogen in the interstitial sites. (C) 2000 Internatio nal Association for Hydrogen Energy. Published by Elsevier Science Ltd. All rights reserved.