Material of 3N7-purity, with grain sizes ranging from 50 to 150ยต, was charged with H and the diffusivity was determined by using an electrochemical method. It was found that both the lattice and grain boundary diffusion coefficients (table 107) were only slightly affected by aging treatments. The latter were expected to have some influence due to the resultant segregation of S.
T.Tsuru, R.M.Latanision: Scripta Metallurgica, 1982, 16[5], 575-8
Table 107
Room-Temperature H Diffusivities in Ni
Condition | Route | D (cm2/s) |
annealed (1050C) | lattice | 3.52 x 10-10 |
annealed (1050C) | grain boundary | 2.05 x 10-8 |
aged (600C, 1h) | lattice | 3.38 x 10-10 |
aged (600C, 1h) | grain boundary | 2.13 x 10-8 |