Hydrogen environment effects on advanced alloys and composites in aerospace structures

The known effects of hydrogen-containing environments on the mechanical behavior of advanced, titanium based materials presently being considered for advanced, aerospace, structures applications are discussed. It is shown that although some understanding has been developed over the past three years, much remains to be developed. Most data of the data strongly suggest that titanium-based alloys should not be used in thermal structures exposed to most elevated temperature, hydrogen-containing environments.