Effects of substitutional impurities on the phase diagrams of V-H and V-D systems

Hydride phase equilibria in V–Ti–Ni alloy membranes

“…Vanadium is highly permeable [6,7] but prone to embrittlement [8]. This can be addressed through alloying; the diffusivity and absorption of hydrogen in vanadium is reduced by Ni [9], Cr and Al [10], whereas Ti decreases diffusivity while increasing absorption [5] between the vanadium a-hydride (a BCC solid solution) and bhydride (a body-centred tetragonal solid solution) exists below 200°C [11,12]. Addition of Ni increases this critical temperature (T C ) for b-hydride formation to >400°C [13] which has major implications for mechanical stability, especially during thermal cycling.…”