Comment on 'Hydrogen solubility in a titanium aluminide alloy'

In a previous paper, experimental results on hydrogen solubility in a titanium aluminide alloy based on Ti3Al, with the composition Ti-24 Al-11 Nb (at. pct.), or Ti-24-11, were reported. Because of the interest in this topic, it is desirable to correct errors in that paper. To compare the earlier data with subsequent charging experiments, some thirty data points are added (some of which overlap plotted points), on Ti3Al, on Ti-24-11 and on various microstructures of Ti-25 Al-10 Nb-3 V-1 Mo (Ti-25-10-3-1). It should be emphasized that the charging experiments used to obtain the data were found to be fully reversible, as was the case in the previous work, and that hydrogen content was measured by microbalance methods. A fit to these data yields an activation energy of -25 kJ/mole H, as shown by the solid line