Mapping dislocation nucleation behavior from bimetal interfaces

被引：109

作者：

Beyerlein, Irene J. ^{[1
]}

Wang, Jian ^{[2
]}

Zhang, Ruifeng ^{[1
]}

机构：

[1] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA

[2] Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA

来源：

ACTA MATERIALIA | 2013年 / 61卷 / 19期

关键词：

Interfaces; Nucleation; Dislocation; Nanocomposites; GRAIN-BOUNDARIES; PLASTIC-DEFORMATION; SCREW DISLOCATIONS; TWIN BOUNDARIES; HIGH-STRENGTH; COMPOSITES; MECHANISM; SIMULATIONS; RESISTANCE; EVOLUTION;

D O I：

10.1016/j.actamat.2013.08.061

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Interfaces between two dissimilar metals have been observed to exhibit a range of atomic structures, from atomically flat to atomically stepped. Using atomic-scale simulation and theory, we study the influence of the intrinsic bimetal interface structure on the nucleation of lattice dislocations. Interface structure is found to have a strong effect on which dislocations are nucleated and the type of nucleation site. We develop a theoretical model that provides criteria for predicting these effects based on key structural relationships between the interface and adjoining crystals. In recognition of these critical conditions, we construct a map that identifies the most likely nucleation site from a given interface. The theory and map developed here can guide efforts to tune interface structures for controlling the strength and deformation of heterogeneous materials. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：7488 / 7499

页数：12

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