An investigation was made, of the diffusion of H in Ni-Fe alloys, by measuring the evolution rate of the gas, to a vacuum, from specimens which were initially saturated with H. The alloys used contained a maximum of 0.01%C and a maximum of 0.005%S (tables 136 and 137). It was reported that both the short- and long-range order of Fe-Ni alloys influenced the diffusion of H.

R.Dus, M.Smialowski: Acta Metallurgica, 1967, 15, 1611-6

 

Table 137

Parameters for H Diffusion in Fe-Ni at 600 to 800C

 

Ni (%)

Do (cm2/s)

E (kcal/mol)

58.70

3.76 x 10-3

9.05

71.90

5.63 x 10-4

4.10

72.38

2.97 x 10-4

4.10

74.94

2.86 x 10-4

3.43

77.96

4.42 x 10-4

4.65

88.40

2.19 x 10-3

7.62