Abstract
The effect of substitutional solutes on the solution of hydrogen gas has been studied by means of hydrogen pressure-composition isotherms in vanadium alloyed with niobium, chromium, or titanium. An isopiestic solubility technique was employed to measure the hydrogen equilibrium pressures for the vanadium alloys from 223 to 473 K. In all the alloys studied, the reaction of hydrogen with the metal phase was exothermic and hydrogen followed Sieverts' law over a considerable range of hydrogen concentration. Additions of titanium to vanadium dramatically enhanced the isopiestic solubility of hydrogen, chromium significantly reduced the solubility, and niobium moderately in-creased the solubility. Sieverts' law behavior for hydrogen in the vanadium alloys showed that substitutional atoms did not act as local, deep traps for hydrogen.
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