The influence of alloying elements on the solubility of hydrogen in the titanium alloys

The interaction coefficient of some alloying elements which has influence on the solubility of hyddrogen in solid titanium alloys has been studied with the published data. The interaction coefficients of chromium, nickel and aluminium are calculated at room temperature and the temperature dependence of interaction coefficient which influences the hydrogen solubility in α-phase titanium-copper system is found in the temperature range of 7300C-7700C. It is shown that at room temperature aluminium has larger effect than chromium or nickel on reducing the hydrogen solubility in titanium hydride. From extrapolating the temperature dependence of interaction coefficient of copper, it is predicted that copper can reduce the solubility of hydrogen in titanium alloy greatly at room temperature. Enthalpy interaction coefficient and entropy interaction coefficient of copper is also calculated from the temperature depenence equation,Σsup(Cu)sub(H) 56500/T - 51.4, and the former is 112.3 Kcal per mole and the latter is -0.102 Kcal per mole. (Author)