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Approved for public release- distribution unlimited 13. ABSTRACT (MAezimm 200 woadW Alloys developed to improve properties such as strength, weight, and corrosion resistance often show decreased resistance to hydrogen embrittlement. The objective of this research was to determine the hydrogen ingress behavior of high performance alloys, particularly in terms of irreversible trapping, with a view to characterizing their interaction with hydrogen and resulting susceptibility to hydrogen embrittlement. A technique referred to as hydrogen ingress analysis by potentiostatic pulsing (HIAPP) was applied to three beta-titanium alloys (Beta-C, Ti-1OV-2Fe-3AL and Ti-13V-1lCr-3A1), an alpha-bet