On solute depletion zones along grain boundaries during segregation

被引：17

作者：

Scheiber, D. ^{[1
]}

Jechtl, T. ^{[1
]}

Svoboda, J. ^{[2
]}

Fischer, F. D. ^{[3
]}

Romaner, L. ^{[1
]}

机构：

[1] Mat Ctr Leoben Forsch GmbH, A-8700 Leoben, Austria

[2] Acad Sci Czech Republ, Inst Phys Mat, Brno 61662, Czech Republic

[3] Univ Leoben, Inst Mech, A-8700 Leoben, Austria

来源：

ACTA MATERIALIA | 2020年 / 182卷

关键词：

Grain boundary segregation; Depletion regions; Thermodynamics; Kinetics; KINETICS; INTERFACE;

D O I：

10.1016/j.actamat.2019.10.040

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We propose a model for predicting the depletion zone arising next to grain boundaries during non-equilibrium segregation. The model directly links to distribution of segregation energies as provided by atomistic simulations. We expose the theoretical framework based on the thermodynamic extremal principle and propose an efficient algorithm to solve the underlying equations. The example of the W-25at%Re is discussed to illustrate the main features of the model. Multi-component segregation kinetics is discussed for segregation of B, C, and N in Mo to illustrate site-competition scenarios. Comparison with earlier results obtained without depletion illustrates the importance of this effects. Finally the depletion zones along GBs are investigated for many different compositions to asses for which material composition and heat treatments they may be observed experimentally. We find that extended depletion zones arise for very small solute concentrations. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：100 / 107

页数：8

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