By using a time-lag technique, the permeation and diffusion of H in ordered and disordered samples was studied. In the case of ordered samples, permeation at temperatures of between 300 and 480C was described by:

P (cm mm/s atm½) = 8.4 x 10-2 exp[-12.25(kcal/g-atom)/RT]

while the diffusivity was described by:

D (cm2/s) = 2.0 x 10-3 exp[-8.75(kcal/g-atom)/RT]

In the case of disordered samples, permeation at temperatures of between 600 and 850C was described by:

P (cm mm/s atm½) = 6.64 x 10-2 exp[-12(kcal/g-atom)/RT]

while the diffusivity was described by:

D (cm2/s) = 3.2 x 10-3 exp[-8.75(kcal/g-atom)/RT]

V.A.Goltsov, V.B.Vykhodets, P.V.Geld, J.P.Simakov: Fiziko-Khimicheskaya Mekhanika Materialov, 1969, 5[5], 597-601

Table 120

Diffusion of H in Ni Alloys at 240 to 360K