Coupled Grain Boundary Motion with Triple Junctions

TL;DR

This paper investigates the dynamics of coupled grain boundary motion with triple junctions in a 2D tricrystal, deriving kinetic relations and numerically analyzing grain shrinkage, highlighting the roles of coupled motion and junction mobility.

Contribution

It introduces a thermodynamic framework for coupled GB motion with triple junctions and provides numerical solutions for shape evolution in a 2D tricrystal.

Findings

Coupled motion significantly influences grain shrinkage.

Junction mobility affects the shape evolution.

Derived kinetic relations match numerical simulations.

Abstract

Coupled grain boundary (GB) motion has been studied in a two-dimensional tricrystal where a cylindrical grain is embedded at the center of the planar GB of a large bicrystal. Kinetic relations for GB dynamics, grain orientations, and junctions have been derived within the framework of Gibbs thermodynamics. These are solved numerically to investigate the shrinkage of the embedded grain while emphasizing the role of coupled motion as well as junction mobility in the shape evolution.