Diffusion coefficients were measured by using Boltzmann-Matano techniques at 230 to 473K:

D (cm2/s) = 4.0 x 10-4 exp[-1.65(kcal/mol)/RT]

The coefficient decreased linearly with increasing H content in all of the alloys. The diffusion results did not agree with the localized deep trapping of H by Ti atoms.

D.T.Peterson, H.M.Herro: Metallurgical Transactions A, 1987, 18[2], 249-54