Solute Segregation in a Moving Grain Boundary: A Novel Phase-Field Approach

TL;DR

This paper introduces a new phase-field model to study solute segregation in moving grain boundaries, revealing how segregation profiles evolve with boundary velocity and impact grain growth, aiding alloy design.

Contribution

A novel phase-field approach that accurately models solute segregation dynamics in moving grain boundaries, aligning with established Cahn solute drag theory.

Findings

Segregation profiles depend on grain boundary velocity.

Velocity variations influence segregation behavior.

Segregation impacts grain growth processes.

Abstract

We present a novel phase-field approach for investigating solute segregation in a moving grain boundary. In our model, the correct choice of various parameters can control the solute-grain boundary interaction potential, resulting in various segregation profiles that agree with Cahn solute drag theory. Furthermore, we explore how different segregation profiles evolve at varying GB velocities owing to the inequality of the atomic flux of solute between the front and back faces of the moving grain boundary. We highlight velocity variations among segregation profiles in low and high-velocity regimes. This model reveals how grain boundary segregation affects grain growth, providing insights for future alloy design