Abstract
The dissolution of hydrogen gas in vanadium-based alloys containing niobium, chromium and titanium was studied by measuring the equilibrium pressure, at various compositions, from 763 to 1125 K. Hydrogen followed Sieverts' law in all the alloys studied up to a hydrogen-to-metal atom ratio of 0.25. The values of the enthalpies of solution of hydrogen for these vanadium-based alloys ranged from −18.5 to −46.8 ± 1.5 kJ (mol H) −1 and the standard entropies of solution of hydrogen ranged from −57.4 to −62.6 ± 5.5 J K −1 (mol H) −1. The present results agree extremely well with a previous low temperature study of these alloys which employed an isopiestic technique to measure indirectly the equilibrium hydrogen pressures.
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