Modeling the Radiation-Induced Segregation of Undersized Solutes Near Grain Boundaries

Modeling of radiation-induced segregation at grain boundaries in Fe–Cr–Ni alloys

“…In the present model the oversized impurity atoms do not change equations for diffusion fluxes of both alloy components and point defects [7]. Fig.…”

“…[7] for a ternary substitutional alloy was used. The equilibrium segregation was not taken into account because for the present the binding energies of chemical elements with grain boundaries in Fe-Cr-Ni alloys are not available in the literature.…”

Formation of grain boundary segregations in alloy Fe-Cr-Ni during strong deformation and under radiation

“…It was assumed that the seg regation processes are developed according to the mechanism of inverse Kirkendall effect as a result of sinking of point defects formed during irradiation or deformation (vacancies and interstitial atoms) onto the GB. The system of equations that describe the variations of the concentrations of point defects and components of the ternary substitution alloy, as well as their mutual recombination, is described in detail in [13,18] and is not included in this discussion. At that, the interaction between the alloying elements was not taken into account (ideal solid solution).…”

“…As in previous studies [12][13][14], in order to simulate the processes of RIS and DIS we applied the model described earlier in [13,18]. A three component alloy Fe-Cr-Ni was considered subjected to severe plastic deformation or radiation.…”

“…At that, the interaction between the alloying elements was not taken into account (ideal solid solution). The simula tion of the DIS and RIS was carried out using a com puter program for describing RIS given in [18]. The values of the parameters used for the computations are given in [12,13,19].…”