Revisiting the transient coarsening kinetics: a new framework in the Lifshitz-Slyozov-Wagner space

TL;DR

This paper introduces a novel framework in the Lifshitz-Slyozov-Wagner space to better understand transient coarsening kinetics in multiphase materials, addressing existing knowledge gaps and contradictions.

Contribution

A new theoretical framework in the dimensionless LSW space is developed to analyze transient coarsening controlled by interface migration and matrix diffusion.

Findings

Derived dynamic equations from thermodynamic extremal principle

Clarified transient coarsening mechanisms

Provided insights into interface migration and diffusion effects

Abstract

Phase coarsening is a fundamental process of microstructure evolution in multiphase materials. A thorough understanding of its kinetics is of great significance for material processing and performance. Generally, coarsening can be divided into the transient stage and the steady stage. Compared with steady coarsening kinetics, the current understanding of transient coarsening is rather limited and contradictory. In the present work, a new framework in the dimensionless Lifshitz-Slyozov-Wagner space is developed to study transient coarsening kinetics co-controlled by interface migration/reaction and matrix diffusion, where the dynamic equation for individual particles is derived from the thermodynamic extremal principle.