SOLUBILITY OF HYDROGEN IN TITANIUM-ALLOYS .1. THE SOLUBILITY OF HYDROGEN IN THE SYSTEM TI1-XGAX, 0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-025

Applying the manometric method, the solubility of hydrogen in alloys Ti//1// minus //xGa//x was studied in the range 0 less than equivalent to x less than equivalent to 0. 25; 5 multiplied by (times) 10** minus **5 less than equivalent to p//H//(//2//)/bar less than equivalent to 1; 773 less than equivalent to T/K less than equivalent to 1298. Within the given range of p and T the phase diagram of Ti//1// minus //xGa//xH//r was investigated for 9 compositions x. In the range of solid solutions, 0 less than equivalent to x less than equivalent to 0. 11, with increasing x the range DELTA r of the hcp phase alpha -Ti//1// minus //xGa//xH//r increases slightly, whereas the range of the bcc phase beta -Ti//1// minus //xGa//xH//r narrows strongly with increasing x. The width DELTA r of the two phase region alpha plus beta is nearly independent of x and the phase boundary between beta -phase and ( beta plus gamma ) region shifts with decreasing DELTA r of the beta -phase to smaller r.