The metallic glass was studied, by using electrochemical techniques, at temperatures of between 313 and 353K. The gas pressures ranged from 1 to 100kPa. It was found that a very good fit to the permeation transients could be obtained by using Fick's theory. The latter results were also in good agreement with data which were obtained by using time-lag methods. The diffusivity was independent of the input H concentration, over the concentration range which was used. The permeability was described by:

P (atomH/s m Pa½) = 2.24 x 1016 exp[-48.99(kJ/mol)/RT]

and the diffusivity (table 179) could be described by:

D (m2/s) = 8.52 x 10-7 exp[-47.07(kJ/mol)/RT]

It was found that annealing (573K, 1h) decreased both the diffusivity and the permeability.

R.W.Lin, H.H.Johnson: Journal of Non-Crystalline Solids, 1982, 51[1], 45-56

Figure 27

Diffusivity of H in Amorphous Alloys

(open squares: FeP13C7Cr10, filled squares: FeP13C7)