Calculation of radiation-induced segregation near moving grain boundaries in Fe-Cr-Ni alloys

A method of calculation of radiation-induced segregation (RIS) and segregation-induced bias (SIB) for a moving plane sink in ternary substitutional alloys is developed. lt is assumed that thermal equilibrium concentrations are maintained at the moving plane, which is considered as transparent to alloy component fluxes. Among various drift forces acting on point defects due to RIS, only Kirkendall ones are taken into account. RIS and SIE for a moving plane grain boundary in Fe-Cr-Ni alloys are calculated. It is shown that the dependence of SIE on dose has a maximum at some intermediate dose which depends on the sink velocity. The limiting case of a moving plane nontransparent for alloy component fluxes is also considered. In this case an additional sink velocity arises due to Kirkendall effect. This additional velocity is calculated in dependence on initial one.