Microstructural coarsening in dense binary systems

doi:10.1016/j.actamat.2022.117964

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Microstructural coarsening in dense binary systems

2022-07-01

闫慧 (Hui Yan)

K. G. Wang *

M. E. Glicksman

DOI：10.1016/j.actamat.2022.117964

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Abstract

En 中文

The kinetics of microstructural evolution driven by phase coarsening (Ostwald ripening) in a binary, two-phase system were studied systematically at ultra high volume fractions of the dispersed phase. Three-dimensional phase-field simulations and theoretical analysis are compared. Late-stage microstructure evolution at ultra high volume fractions (V-v > 0.9) are reported here. One interesting finding is that the scaling exponents, m, for the kinetics of phase coarsening at ultra high volume fractions take values in the range 2 < m < 3, depending on the precise volume fraction of the dispersed phase, when varied over the narrow range 0.9 < V-v < 1. This result is confirmed by a comparative study of simulated microstructures and measurements of interfacial energy decay rates with theoretical coarsening analysis. Scaled particle-size distributions derived from simulations at ultra high volume fractions agree neither with Wagner's 3D particle-size distribution for interface-reaction controlled phase coarsening, nor with Lifshitz and Slyozov's particle-size distribution for diffusion-controlled phase coarsening. The research reported substantiates that the kinetics of microstructure evolution at ultra high volume fractions, approaching true grain growth, exhibits a varying blend of both interface reaction-controlled and volume diffusion-controlled phase coarsening. (C) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keywords:

Microstructures

Ostwald ripening

Phase-field simulations

Alloys

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