Abstract
Abstract Solubility measurements of hydrogen and deuterium gases in pure titanium and titanium—oxygen alloys with 10–30 at %O have been performed in the temperature range of 600–850°C at pressures below 100 Pa by a constant-volume method. All the solubility data obeyed Sieverts' law. The solubility of hydrogen in titanium and titanium—oxygen alloys was larger than that of deuterium. The solubility decreased with increasing oxygen content in titanium, while the enthalpy of solution was almost constant irrespective of the oxygen content. On the basis of the dilute interstitial solution model, the reduction in hydrogen solubility by solute oxygen was explained by the blocking effect. The isotope effect on solubility was discussed on the assumption that an interstitial hydrogen isotope atom behaves as a harmonic oscillator in the titanium matrix. The vibrational frequency of a hydrogen atom in titanium was obtained, which allowed a prediction of the tritium solubility. The estimated solubility of tritium in titanium and titanium—oxygen alloys was smallest, followed by deuterium and hydrogen.
Published Version
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