Hydrogen storage characteristics of Ti-Zr-Cr-V alloys

The improvement of hydrogen storage characteristics by substituting zirconi um for titanium in Ti-Cr-V alloys has been studied at 303 K. Zirconium subs titution decreased the equilibrium pressure and the hysteresis of the P-C i sotherm. However, it increased the slope of the P-C isotherm and decreased the hydrogen storage capacity by forming the ZrCr2 phase. By modifying the composition ratio of titanium to chromium, thereby suppressing the formatio n of the ZrCr2 phase, an alloy having very high hydrogen storage capacity w as realized. Heat treatment of the alloys improved the flatness of the plat eau greatly without a decrease in both the maximum acid the effective hydro gen storage capacities. (C) 1999 Elsevier Science S.A. All rights resented.