Abstract
Hydrogen trapping in three β-titanium alloys (unaged and aged Ti15V3Cr3Al3Sn and Beta-21S, and partially aged Beta-C) was investigated using a potentiostatic pulse technique. The apparent trapping constant ( k a) and hydrogen entry flux were determined for each alloy in 1 mol 1 −1 acetic acid/1 mol 1 −1 sodium acetate. The results were compared with those for other β-Ti alloys (Ti10V2Fe3Al, Ti13V11Cr3Al and fully aged Beta-C) studied previously. Aging caused a negligible change in k a for Ti-15-3, whereas a marked increase was observed for Beta-21S and the other β-Ti alloys. Among the aged alloys, Ti-13-11-3 had the highest value of k a and Ti-15-3 had the lowest value. The intrinsic susceptibilities of Beta-C and Beta-21S to hydrogen embrittlement (HE), as represented by the trapping constants, were comparable and significantly higher than that of Ti-15-3. The susceptibilities were consistent with the relative resistances to HE observed for these alloys.
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