Hydrogen absorption-desorption properties and crystal structure analysis of Ti-Cr-Mo alloys

We investigated that heat treatment condition, hydrogen absorption-desorption properties and crystal structure of Ti-(55−x)Cr-x Mo alloys by the use of X-ray diffraction (XRD) and PCT measurement. We found that the quenching treatment was effective to synthesize bcc single phase alloys in comparison with annealing treatment. The lattice parameter, a, of bcc phase in the quenched alloys showed linear relationship with increasing the Mo content. The as-cast alloys had a sloping plateau, while the quenched alloys had a flat plateau. The alloys showed the equilibrium pressure increased with increasing the Mo content. The hydrogen reversible capacity of the alloys reached 1.33-1.39 H/M (2.34-2.68 mass%) under hydrogen pressure 8.0 MPa at 313 K.