Extensive investigations intended to provide information relating to the mechanism of hydrogen embrittlement in titanium-base alloys were carried out. Studies included detailed measurements of the effects of tem¬perature, strain rate, and hydrogen content on hydrogen embrittlement; examination of all-alpha and all-beta alloys for susceptibility to hydrogen embrittlement; calculations of probable hydrogen solubility in alpha and beta titanium; and several other informative investigations,, An embrittle¬ment mechanism is outlined. Alloys previously prepared and examined to determine the effects of alloy content and microstructure on hydrogen em¬brittlement (WADC TR 54-616, Part IV) were further studied by means of notched stress-rupture tests. This work has resulted in some alteration in previously expressed conclusions regarding alloying and microstructural effects.
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