A study was made of the effect of dislocations and traps upon H diffusion, in high-purity zone-melted Fe, by using the time-lag permeation technique (tables 33 and 34). It was found that dislocations exerted a transient trapping effect upon the mobile H atoms.
R.Bouraoui, M.Cornet, S.Talbot-Besnard: Comptes Rendus, 1973, 277[5], 231-4
Table 33
Diffusivity of H in Fe at 20C as a Function of Tensile Deformation
Deformation (%) | D (cm2/s) | Trap Density (/cm3) | Dislocation Density (/cm2) |
5 | 7.5 x 10-5 | 8.0 x 1017 | 2.7 x 109 |
10 | 6.9 x 10-5 | 1.7 x 1018 | 5.4 x 109 |
15 | 6.2 x 10-5 | 2.8 x 1018 | 8.1 x 109 |
20 | 5.6 x 10-5 | 4.2 x 1018 | 1.06 x 1010 |
Table 34
Diffusivity of H in Fe at 20C as a Function of Rolling Deformation
Deformation (%) | D (cm2/s) | Trap Density (/cm3) | Dislocation Density (/cm2) |
8.8 | 5.1 x 10-5 | 5.7 x 1018 | 5.6 x 109 |
20 | 5.5 x 10-5 | 4.5 x 1018 | 8.6 x 109 |
22 | 5.1 x 10-5 | 5.7 x 1018 | 9.1 x 109 |
28 | 4.3 x 10-5 | 8.5 x 1018 | 1.07 x 1010 |
30 | 4.4 x 10-5 | 8.1 x 1018 | 1.13 x 1010 |
41 | 4.4 x 10-5 | 8.1 x 1018 | 1.42 x 1010 |
51 | 4.1 x 10-5 | 9.4 x 1018 | 1.68 x 1010 |
60 | 4 x 10-5 | 9.9 x 1018 | 1.92 x 1010 |