Phase-field modeling of the discontinuous precipitation reaction

被引：23

作者：

Amirouche, Lynda ^{[1
,2
]}

Plapp, Mathis ^{[1
]}

机构：

[1] Ecole Polytech, CNRS, F-91128 Palaiseau, France

[2] USTHB, Fac Phys, Phys Theor Lab, Bab Ezzouar 16311, Alger, Algeria

来源：

ACTA MATERIALIA | 2009年 / 57卷 / 01期

关键词：

Phase-feild modeling; Percipitation; Grain boundary diffusion; Phase transformation kinetics; Microstructure; ELASTIC STRAIN; GROWTH; SOLIDIFICATION; ZN;

D O I：

10.1016/j.actamat.2008.09.015

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A multi-phase-field model for the description of the discontinuous precipitation reaction is formulated which takes into account surface diffusion along grain boundaries and interfaces as well as volume diffusion. Simulations reveal that the structure and steady-state growth velocity of spatially periodic precipitation fronts depend strongly on the relative magnitudes of the diffusion coefficients. Steady-state solutions always exist for a range of interlamellar spacings that is limited by a fold singularity for low spacings, and by the onset of tip-splitting or oscillatory instabilities for large spacings. A detailed analysis of the simulation data reveals that the hypothesis of local equilibrium at interfaces, used in previous theories, is not valid for the typical conditions of discontinuous precipitation. (c) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：237 / 247

页数：11

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