Coefficients for the range, 839 to 1320C, were determined by using the residual activity method and 48V in alloys containing 0 to 90wt%V. Analysis of the results (table 203) showed that, at a given temperature, the variation in ln[D(C)] was linear in the concentration range of 1.6 to 28wt%V, and parabolic in V-rich solutions (65 to 90wt%V). In both cases, the diffusivity of V decreased with increasing V concentration. Peaks in the ln[Do(C)] and activation energy curves, found at 24wt%V, were attributed to the effect of the Fe3V ordered structure. Similar peaks, observed at 75wt%V, were similar to those noted in the Fe-Cr system.

K.Obrtlik, J.Kucera: Physica Status Solidi A, 1979, 53[2], 589-98

Table 204

Diffusion of C in Fe-1.1at%W at 1000C

Table 205

Diffusion Parameters for Zn in α-Fe