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 14 and 15). 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 15

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