Influence of Alloying Elements on the Solubility of Hydrogen in Vanadium

Solubility of hydrogen in vanadium and its binary alloys containing titanium, chromium, iron and cobalt, respectively was measured in the temperature range between 600 and 1200°C under one atmosphere pressure of hydrogen gas. The influence of alloying elements on the solubility, and the correlation between hydrogen solubility and electronic structure of alloys were discussed.The following results were obtained:(1) The solubility decreased with increase in amount of each alloying element, with the exception of titanium.(2) The lattice strain induced by alloying did not affect the solubility.(3) Relative partial molar entropy and enthalpy increased linearly with increase in electron/atom ratio from 4.9 to 5.4.(4) Variation in entropy was correlated to that in the electronic specific heat coefficient of alloy.(5) Variation in enthalpy was explained by that in density of state at the Fermi surface in the alloys.