The self-diffusion of Fe in foil samples was studied by using the Kriukov-Joukhovitsky and Gruzin methods (table 178). It was shown that, with the onset of structural relaxation during heat treatment at temperatures between 150 and 300C, the surface layers of the material were modified due to chemical evolution during diffusion of the tracer, which was characterized by segregation of P and B.
J.J.Schuehmacher, P.Guiraldenq: Acta Metallurgica, 1963, 31[12], 2043-9
Table 180
Coefficients for 32P Diffusion in Thin Films of Fe40Ni40P14B6
Temperature (C) | Coefficient (m2/s) |
170 | 5.7 x 10-24 |
200 | 1.8 x 10-23 |
230 | 2.5 x 10-23 |
256 | 3.3 x 10-22 |