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.

G.Arnold, J.M.Welter: Metallurgical Transactions A, 1983, 14[8], 1573-7

 

Table 200

Diffusivity of Sn in Fe-Sn

 

Sn (wt%)

Temperature (C)

Coefficient (m2/s)

0.3

760

7.0 x 10-12

0.3

850

3.1 x 10-14

0.3

890

8.0 x 10-14

0.3

962

3.6 x 10-14

0.3

1052

9.9 x 10-14

0.3

1200

6.2 x 10-13

1.6

850

3.6 x 10-14

1.6

890

4.3 x 10-14

1.6

962

1.4 x 10-13

1.6

1060

2.9 x 10-13

1.6

1200

1.1 x 10-12