Solute effects on interfacial dislocation emission in nanomaterials: Nucleation site competition and neutralization

被引：20

作者：

Borovikov, Valery ^{[1
]}

Mendelev, Mikhail I. ^{[1
]}

King, Alexander H. ^{[1
,2
]}

机构：

[1] Ames Lab, Div Mat Sci & Engn, Ames, IA 50011 USA

[2] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA

来源：

SCRIPTA MATERIALIA | 2018年 / 154卷

关键词：

Solute segregation at grain boundaries; Dislocation nucleation; Yield stress; Monte Carlo simulation; Molecular dynamics simulation; GRAIN-BOUNDARY SEGREGATION; NANOCRYSTALLINE ALLOYS; MOLECULAR-DYNAMICS; STRENGTH; CU; SIZE; MAXIMUM; METALS; DESIGN; COPPER;

D O I：

10.1016/j.scriptamat.2018.05.011

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Solutes added to stabilize nano-crystalline metals against grain growth, may segregate to grain boundaries and triple junctions where they can affect the process of the dislocation emission. We demonstrate that this effect can be very complex due to different rates of segregation at different interfaces. Moreover, at large concentrations, when the solutes form clusters, the interfaces between these clusters and the matrix can introduce new dislocation emission sources, which can be activated under lower applied stress. Thus, the strength maximum can occur at a certain solute concentration: adding solutes beyond this optimal concentration can reduce the strength of the material. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：12 / 15

页数：4

共 30 条

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