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The solubility of hydrogen and deuterium in α-, α,β- and β-titanium, Ti94Al6 and in α2-Ti3Al has been volumetrically measured in the ranges of temperature 623-1323 K and hydrogen concentration (atomic ratio) 0.001-0.25. The equilibrium hydrogen pressure at a given temperature and hydrogen concentration has been found to increase greatly as the aluminium content increases. This is explicable on the assumption that aluminium atoms block some of the sites available to hydrogen atoms. In contrast, the heat of solution of hydrogen only slightly increases with the aluminium content and in α-titanium, α-Ti94Al6 and α2-Ti3Al, the ratio of the deuterium pressure to the hydrogen pressure at identical hydrogen and deuterium concentrations is almost independent of the aluminium content. A possible cause of the small dependence of the measured heat and ratio on the aluminium content is discussed and occupation of the tetrahedral site by hydrogen atoms is suggested for α-titanium, α-T94Al6 and α2-Ti3Al. The origin of the sloping plateaus observed in the pressure-composition isotherms for α, β-Ti94Al6 is also briefly discussed.
Dissolution of hydrogen and deuterium in titanium, Ti94Al6 and Ti3Al
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