There is an increasing interest in the influence of hydrogen on the mechanical properties of titanium alloys, particularly those properties which are dependent upon the initiation and propagation of cracks under the conditions of sustained-load cracking, slow crack growth, and low-cycle fatigue. The subject has been reviewed recently by Paton and Williams. In particular it is now appreciated that in Ti-Al alloys hydrides may form on the {101O}a and (0001)α slip planes. The latter are predominant at low (350 ppm) hydrogen concentrations in alloys of high (6.6%) aluminium content and may also nucleate in the strain field around a Vickers microhardness indentation.
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