Abstract
The change in hydrogen concentration as a function of applied strain has been studied in commercial titanium alloys that included threeβ-phase, twoα-phase, and an (α + β)-phase Ti-6Al-4V alloy with differingα/β morphologies.Insitu measurements were made using a nondestructive nuclear technique on samples for which uniaxial compressive and tensile stresses were applied by four-point bending.
Theβ-phase alloys exhibited hydrogen redistribution under an elastic stress gradient, but no further change was discernible accompanying plastic deformation. The extent of hydrogen concentration change for theβ-phase alloys was of the order of 4 to 6 pct for a 620 MPa stress gradient. This is less than would be predicted based on available data for the partial molal volume of hydrogen. Diffusion coefficients in a stress gradient were also determined and are consistent with those measured inβ-phase titanium at elevated and room temperatures. Within the experimental sensitivities there was no evidence of hydrogen redistribution with applied stress for theα-phase and Ti-6Al-4V alloys.
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Adler, P.N., Schulte, R.L., Schneid, E.J. et al. Stress induced hydrogen redistribution in commercial titanium alloys. Metall Trans A 11, 1617–1623 (1980). https://doi.org/10.1007/BF02654526
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DOI: https://doi.org/10.1007/BF02654526