Phase field simulation of grain growth with grain boundary segregation

Abstract

Phase field simulation of grain growth with grain boundary segregationThe effects of grain boundary segregation and solute drag on grain size distributions were studied by employing the multi-phase-field method. It is shown that for normal grain growth the solute drag effect results in narrow steady state grain size distributions compared with the ideal grain growth. Besides influencing the normal grain growth, the solute drag can also induce abnormal grain growth. In some cases of abnormal grain growth self-similar grain size distributions are found and these distributions can be fitted by the lognormal function, which is consistent with the experimental observations.

Abnormal grain growth: a non-equilibrium thermodynamic model for multi-grain binary systems

“…A significant impact in the theoretical understanding of the solute drag affected normal and abnormal grain growth has come from the multi-phase field concept, which obviously can be considered as the first theoretical step to understanding abnormal grain growth provoked by solute drag. Here the works by Kim and Park [17] and Li et al [18], as well as the very recent papers [19][20][21], can be regarded as very relevant contributions. Recently published contributions such as phase field studies concerning grain growth and drag related to second particles, [22,23], should also be mentioned due to their similarity to solute drag affected grain growth.…”

“…The goal of this paper is to show how the TEP offers explicit evolution equations for grain growth and solute segregation as direct functions of the actual state of the system described by the grain radius and the corresponding segregation parameter for each grain in the system. Similarly to the recent concepts presented in [17][18][19][20][21][22][23][24][25][26][27][28][29], the grain boundaries are described by finite regions which interact with neighbouring grains and develop a specific concentration profile of the solute segregated in the grain boundary. However, these concepts can barely treat the kinetics of sufficiently large and statistically relevant systems.…”