A capillary gas-reservoir technique was used to study the diffusion of H in liquid Ni. Following diffusion annealing, the capillary was quenched and the H distribution was determined via sectioning and vacuum extraction analysis. The diffusivity was equal to 3.17 x 10-3cm2/s at 1468 and to 3.48cm2/s at 1550C. The results, for 1468 to 1550C, could be fitted by:
D (cm2/s) = 5.00 x 10-2 exp[-9.736(kcal/mol)/RT]
Diffusivity of Hydrogen in Liquid Nickel and Copper. J.H.Wright, M.G.Hocking: Metallurgical Transactions, 1972, 3[7], 1749-53
Table 108
Diffusion Parameters for H in Ni Alloys
Solute | C (at%) | Do (m2/s) | E (kJ/mol) |
Cu | 10.1 | 6.80 x 10-7 | 40.84 |
Cu | 20.1 | 5.98 x 10-7 | 40.92 |
Cu | 30.0 | 4.86 x 10-7 | 40.92 |
Al | 2.0 | 5.63 x 10-7 | 40.88 |
Al | 4.0 | 4.21 x 10-7 | 40.84 |
Al | 8.0 | 1.86 x 10-7 | 40.46 |
Al | 10.0 | 1.32 x 10-7 | 40.08 |
Si | 2.0 | 6.70 x 10-7 | 40.92 |
Si | 4.1 | 6.30 x 10-7 | 41.05 |
Si | 6.1 | 5.65 x 10-7 | 41.25 |
Si | 8.2 | 4.99 x 10-7 | 41.59 |
Ti | 2.0 | 6.59 x 10-7 | 40.29 |
Ti | 4.0 | 6.05 x 10-7 | 39.96 |
Ti | 6.0 | 5.40 x 10-7 | 39.79 |
Ti | 8.0 | 4.30 x 10-7 | 39.58 |
V | 3.0 | 6.73 x 10-8 | 35.23 |
V | 6.0 | 7.11 x 10-8 | 36.07 |
V | 9.0 | 2.42 x 10-7 | 40.12 |
Cr | 5.0 | 4.54 x 10-7 | 40.71 |
Cr | 10.0 | 2.50 x 10-7 | 40.33 |
Cr | 15.0 | 1.31 x 10-7 | 39.96 |
Cr | 20.0 | 5.65 x 10-8 | 39.37 |
Fe | 5.0 | 3.29 x 10-7 | 39.62 |
Fe | 10.0 | 1.27 x 10-7 | 37.70 |
Fe | 15.0 | 4.30 x 10-8 | 35.69 |
Fe | 20.0 | 2.25 x 10-8 | 34.98 |
Co | 10.0 | 2.55 x 10-7 | 39.46 |
Co | 20.0 | 2.50 x 10-8 | 35.02 |
Co | 25.0 | 1.45 x 10-8 | 34.31 |
Co | 30.0 | 1.72 x 10-8 | 35.35 |
Table 109
Diffusivity of H in Ni5-yAlyLaHx at 300K
y | x | D (cm2/s) |
0 | 6.2 | 1.5 x 10-8 |
0.4 | 5.4 | 8.1 x 10-9 |
0.5 | 5.24 | 7.8 x 10-9 |
0.7 | 4.64 | 1.5 x 10-9 |
1.0 | 4.33 | 2.3 x 10-10 |
1.2 | 4.04 | 1.1 x 10-10 |