The diffusion coefficients were measured in solid-solution phases, FeTiHx and FeTiDx, where x was less than 0.03, by using absorption/desorption experiments and Pd-coated bulk samples. The pressures and temperatures ranged from 1 to 120bar and from 370 to 800K, respectively. When x tended to zero, the diffusion coefficients obeyed the relationships:

H (absorption):     D (cm2/s) = 1.0 x 10-3 exp[-5890/T]

H (desorption):     D (cm2/s) = 5.5 x 10-4 exp[-5710/T]

D (absorption):     D (cm2/s) = 8.2 x 10-4 exp[-6080/T]

D (desorption):     D (cm2/s) = 5.5 x 10-4 exp[-5980/T]

The release of H by uncoated samples was controlled mainly by surface effects.

Diffusivity of Hydrogen and Deuterium at Low Concentration in Fe0.5Ti0.5. G.Arnold, J.M.Welter: Metallurgical Transactions A, 1983, 14[8], 1573-7

Table 82

Diffusion Parameters for H in Fe90Zr10