It was found that C in 32.5wt%Ni tended to migrate towards higher-temperature regions when the C content was low. When the C content was higher, a sudden jump in the latter occurred when part of the specimen was in a two-phase region. The portion situated in the single-phase region continued to exhibit solute migration up the temperature gradient. It was deduced that the heat of transport of C in the γ-phase alloys was -12.2kJ/mol over a wide range of C contents (table 133).

I.C.I.Okafor, O.N.Carlson, D.M.Martin: Metallurgical Transactions, 1982, 13A[10], 1713-9

 

Table 132

Carbon Diffusion and Electrotransport in Fe-32.5wt%Ni

 

C (wt%)

Field (V/cm)

Temperature (K)

Mobility (cm2/Vs)

D (cm2/s)

0.10

0.0870

1220

3.73 x 10-6

1.00 x 10-7

0.10

0.1028

1315

1.12 x 10-5

3.54 x 10-7

0.10

0.0911

1360

1.71 x 10-5

5.43 x 10-7

0.10

0.2430

1415

1.69 x 10-5

5.62 x 10-7

0.21

0.0865

1220

5.76 x 10-6

1.54 x 10-7

0.23

0.0921

1310

1.06 x 10-5

3.32 x 10-7

0.21

0.0527

1335

2.20 x 10-5

6.53 x 10-7

0.21

0.2271

1415

3.26 x 10-5

1.12 x 10-7