Effects of Alloying Elements on the Solubility of Hydrogen in Beta Titanium

The solubility of hydrogen in beta titanium and beta solid solution of its binary alloys with vanadium, chromium, manganese, iron, cobalt, nickel, copper, zirconium, niobium, molybdenum and tantalum has been measured by Sieverts’ method. The measurements were made as a function of temperature in the range from 750 to 900°C and of hydrogen pressure from 0.5 to 25 mmHg. Solubility of hydrogen in all alloys investigated obeyed Sieverts’ law up to 5 atomic per cent. All the alloying elements except zirconium, niobium and tantalum decrease the hydrogen solubility of titanium. The effect of each alloying element was described in terms of interaction parameter. Each alloying element has only a small effect on the heat of solution of hydrogen in beta titanium. Niobium was the only element that increased the heat of solution.