MODELING RADIATION-INDUCED SEGREGATION IN BINARY ALLOYS

Abstract

A computer code to calculate the time and space dependencies of the defect and component concentrations of a binary alloy is developed. This code is based on the theoretical model for radiation-induced segregation governed by first and second Fick’s laws with taking into account inverse Kirkendall effect. The system of three coupled partial differential equations for concentrations of one of components and point defects is converted to the system of ordinary differential equations in time by a discretization procedure. Numerical solutions of this system are obtained under appropriate initial and boundary conditions by means of the MATLAB. The modeling of radiation-induced segregation in binary Fe-Cr alloys is carried out for various initial concentrations of components, temperatures, dose rates and doses. The process of achievement of steady state at dose rising is demonstrated. The calculated concentration profiles are compared with experimental profiles published in literature. The sensitivity of model to input parameters is done and the capabilities of proposed model are estimated. This computer code for multicomponent alloys is developed.

Keywords

• матеріали реакторобудування
• радіаційно-індукована сегрегація
• двокомпонентні металеві сплави
• профіль концентрації
• точкові дефекти
• обернений ефект Кіркендала
• рівняння балансу
• комп’ютерне моделювання