The Model of Deformation-Induced Segregation near a Moving Grain Boundary in the Fe-Cr-Ni Alloy

摘要

A model is proposed of diffusion-induced segregation at a moving grain boundary in a three-component alloy upon severe plastic deformation with allowance for generation and absorption of point defects and their mutual recombination. Redistribution of atoms of alloying elements and formation of near-boundary segregates during severe plastic deformation in stable austenitic alloys of the Fe-12Cr-30Ni type is studied. It has been shown by numerically solving an appropriate set of equations that the motion of a grain boundary leads to the formation of a deformation-induced segregation with an asymmetrical profile of the component concentrations. The boundary is being enriched with nickel and depleted of the other components.