Kinetic mechanisms of hydrogen absorption in V-Ti-Cr alloys

The kinetic mechanisms of (TiCr)_1-xV_x(x=0.05, 0.10, 0.35) alloys were investigated based on the experiments and kinetic function calculations. The results show that with the increase of vanadium content, the microstructure transforms from primary single Laves phase into Laves phase and low V body center cubic (BCC) solid solution double phases, and high V BCC solid solution single phase finally. Correspondingly, the kinetic mechanisms of hydrogen absorption in these alloys are found to be controlled firstly by a chemical reaction mechanism, then by a nucleation and growth mechanism, and a 3-dimensional diffusion mechanism. An apparent correspondence between phase structure and hydrogen absorption mechanism is observed-the alterant kinetic mechanisms often obviously change the kinetic reaction rate especially, for the faster chemical reaction mechanism and slower 3-dimensional diffusion mechanism.