High-pressure hydrogenation properties of Ti-V-Mn alloy for hybrid hydrogen storage vessel

Ti-V-Mn alloys, which are one of the suitable materials for a high-pressure hybrid hydrogen storage vessel of 35 MPa, have been evaluated the hydrogenation properties and the microstructures. Among the Ti-V-Mn alloys produced by as-cast arc melting and annealing treatment at 1223 K, a Ti0.5V0.5Mn alloy particularly absorbed hydrogen up to 2.1 wt% at 260 K under 35 MPa H-2. The hydrogen desorption pressure isotherm showed sloping plateau in the range of 0.3-0.6 MPa at 260 K. This effective hydrogen capacity under H-2 pressure from 35 to 0.1 MPa was 1.9 wt%. The alloy mainly consisted of the hexagonal C14 Laves and BCC phases. The microstructure of the several phases in the alloy was revealed by transition electron microscopy (TEM). (C) 2008 Elsevier B.V. All rights reserved.