By using the Gruzin radioactive tracer technique, the tracer diffusion coefficients of 63Ni in Fe-18.5Cr-9.5%Ni (0.027%C, 0.6%Si) were studied at 800 to 1200C. The results could be described by:

bulk:     D (cm2/s) = 1.4 x 100 exp[-72(kcal/g-atom)/RT]

grain-boundary:     D (cm3/s) = 2.95 x 10-12 exp[-17(kcal/g-atom)/RT]

D.Marchive, D.Duc, D.Treheux, P.Guiraldenq: Comptes Rendus Hebdomaires des Seances de l’Academie des Sciences, Serie C, 1975, 280[1], 25-8

 

Table 95

Grain Boundary Diffusion Parameters for 63Ni in

Fe-Ni-19wt%Cr Alloys at 900 to 1200C

 

Ni (wt%)

Do (cm3/s)

E (kcal/g-atom)

10

2.95 x 10-12

17

30

1.4 x 10-9

34

45

1.6 x 10-3

68

55

2.4 x 10-7

44

65

1.6 x 10-4

60.5

75

4.0 x 10-5

60.5