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Effect of hydrogen on the mechanical properties of titanium and its alloysOccluded hydrogen resulting from cathodic charging of commercially pure titanium and titanium alloys, Ti-8Al-1Mo-1V and Ti-6Al-4V, was shown to cause embrittlement of the alloys. Embrittlement was a function of the interstitial hydrogen content rather than the amount of precipitated titanium hydride. The effects of hydrogen concentration on the critical strain for plastic instability along pure shear directions was determined for alloys Ti-8Al-1Mo-1V and Ti-5Al-2.5Sn. Hydrogen, in concentrations below that necessary for spontaneous hydride precipitation, increased the strain necessary for instability formation or instability failure. The strain rate sensitivity also increased with increasing hydrogen concentration. The effect of hydrogen on slip and twinning was determined for titanium single crystals. The critical resolved shear stress for prism slip was increased and the critical resolved shear stress for twinning was decreased with increasing hydrogen concentration.
Document ID
19750018024
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Beck, F. H. (Ohio State Univ. Columbus, OH, United States)
Date Acquired
September 3, 2013
Publication Date
June 1, 1975
Subject Category
Metallic Materials
Report/Patent Number
NASA-CR-134796
Accession Number
75N26096
Funding Number(s)
CONTRACT_GRANT: NGL-36-008-051
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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