Diffusion in FeNiCr alloys with an F.C.C. lattice

Thermal and radiation-induced segregation in model Ni-base alloys

“…At later stages in the irradiation, Cr and Fe are replaced with Ni at nearly equal rates. The measurements indicate that Fe diffuses at about the same rate as Cr in the Ni-18Cr-9Fe alloy, contrary to hightemperature diffusion measurements [19] that show Cr to be the faster diffuser. A possible explanation for the anomalous segregation behavior in the Ni18Cr-9Fe alloy is strong attractive short range ordering forces between Cr and Ni.…”

“…Thus, less chromium depletion and nickel enrichment is seen in Ni-18Cr-9Fe. The overall vacancy diffusivity is faster in Ni-18Cr-9Fe than in Ni18Cr [18,19], driving the segregation to steady-state faster in Ni-18Cr-9Fe (see Fig. 4).…”

Nickel-plating for active metal dissolution resistance in molten fluoride salts

“…The diffusion of Cr and Fe through the Ni-plating would likely be problematic over long term use, for thinner Ni platings. Cr has a slightly higher diffusion coefficient than Fe in Ni [13], but when Fe and Cr reach the surface of the Ni-plating, the Cr is dissolved to a larger extent than the Fe.…”

“…Likewise, grain boundary diffusion of Cr has also been found to be mediated by vacancies [10]. There is very little diffusive interaction between Cr, Fe, and Ni atoms and from tracer diffusion measurements it has been shown that D Ni⁄ :D Fe⁄ :D Cr⁄ = 1:1.2:2 over the temperature range of $950-1275°C in a wide range of Fe-Ni-Cr alloys [12][13][14].…”

Understanding of the Elemental Diffusion Behavior in Concentrated Solid Solution Alloys

“…Figure 3 shows the calculated tracer diffusion coefficients of Cr and Fe within the fcc Fe-Cr65wt.%Ni alloys at different temperatures. The experimental data are from Million et al [31] One can see that the tracer diffusion coefficients of both Cr and Fe decrease slightly with the increasing of Cr composition (decreasing of Fe composition). The directly measured Ni tracer diffusion coefficients by Vaidya et al [10] in both the CoCrFeNi and CoCrFeMnNi alloys are very important reference data for the present work.…”