Strengthening effects of coherent interfaces in nanoscale metallic bilayers

被引：46

作者：

Medyanik, Sergey N. ^{[1
]}

Shao, Shuai ^{[1
]}

机构：

[1] Washington State Univ, Sch Mech & Mat Engn, Pullman, WA 99164 USA

来源：

COMPUTATIONAL MATERIALS SCIENCE | 2009年 / 45卷 / 04期

关键词：

Atomistic simulation; Molecular statics; Interfaces; Metallic multilayers; Dislocations; Nanoindentation; Nanomaterials; EMBEDDED-ATOM METHOD; BICRYSTAL INTERFACES; DISLOCATION NUCLEATION; DEFORMATION; MULTILAYERS; COMPOSITES; COPPER; NANOINDENTATION; SIMULATIONS; MECHANISMS;

D O I：

10.1016/j.commatsci.2009.01.013

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Dislocation nucleation and propagation in a Cu-Ni bilayer with coherent (111) interface are examined using atomistic simulations. Nanoindentation model is applied to generate dislocations at and near the surface. Mechanisms of interactions between gliding dislocations and coherent interface are investigated. It is found that the interface acts as a strong barrier to dislocation propagation, which results in considerable strengthening of the bilayer. The results are compared to indentation of pure Cu and pure Ni single crystals. It is found that the obtained maximum load for indentation of the Cu-Ni bilayer is higher than for any of the two pure materials. Strain hardening of the bilayer system due to the presence of interface is investigated by analyzing the indentation load-displacement curves. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：1129 / 1133

页数：5

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