The diffusion of 63Ni in the face-centered cubic phases of this alloy system was studied by using radioactive tracer and electron microprobe techniques at between 985 and 1305C. The results (table 139), together with thermodynamic mixing data, permitted the verification of Darken’s theory of interdiffusion.

B.Million, J.Ruzicková, J.Velisek, J.Vrestal: Materials Science and Engineering, 1981, 50[1], 43-52

 

Table 142

Lattice Diffusion Parameters for 22P in Fe-Ni

 

P (at%)

Ni (at%)

Phase

Do (m2/s)

E (kJ/mol)

-

-

paramagnetic

2.87 x 10-2

271

-

-

ferromagnetic

1.38 x 101

332

0.16

-

paramagnetic

3.76 x 10-2

275

0.16

-

ferromagnetic

1.08 x 10-1

288

0.18

-

paramagnetic

2.55 x 10-3

247

0.18

-

ferromagnetic

1.06 x 103

359

0.38

-

paramagnetic

8.87 x 10-3

259

0.38

-

ferromagnetic

4.90 x 100

316

0.14

1.03

paramagnetic

5.98 x 10-2

277

0.14

1.03

ferromagnetic

4.39 x 101

336