The grain boundary self-diffusion parameter, G = sδD (where s was the segregation factor, δ was the grain boundary width, and D was the grain boundary diffusion coefficient), was measured for 51Cr in 18Cr-12wt%Ni alloy. The experiments were performed, at 973 to 1223K, by using sectioning methods. The temperature dependence of G (table 85) could be described by:

G (m3/s) = 1.17 x 10-10 exp[-234/RT]

The diffusion of Fe, Ni and Cr was described by:

D (m3/s) = 6.7 x 10-12 exp[-207/RT]

J.Čermák: Zeitschrift für Metallkunde, 1990, 81[3], 193-5

Table 86

Bulk Diffusion Parameters for 59Fe in

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