Plastic instability mechanisms in bimetallic nanolayered composites

被引：145

作者：

Zheng, S. J. ^{[1
]}

Wang, J. ^{[2
]}

Carpenter, J. S. ^{[3
]}

Mook, W. M. ^{[1
]}

Dickerson, P. O. ^{[3
]}

Mara, N. A. ^{[1
,3
]}

Beyerlein, I. J. ^{[4
]}

机构：

[1] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, MPA CINT, Los Alamos, NM 87545 USA

[2] Los Alamos Natl Lab, MST 8, Div Mat Sci & Technol, Los Alamos, NM 87545 USA

[3] Los Alamos Natl Lab, MST 6, Div Mat Sci & Technol, Los Alamos, NM 87545 USA

[4] Los Alamos Natl Lab, T3, Div Theoret, Los Alamos, NM 87545 USA

来源：

ACTA MATERIALIA | 2014年 / 79卷

关键词：

Interfaces; Twinning; Shear bands; Nanolayered composites; TEM; TEXTURE EVOLUTION; DEFORMATION MECHANISMS; INTERFACE STRUCTURE; HIGH-STRENGTH; SLIP; NANOCOMPOSITES; BOUNDARIES; INITIATION; STABILITY; PROPERTY;

D O I：

10.1016/j.actamat.2014.07.017

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Strain localization is a common deformation-induced instability in many metallic metals. How it happens is related to both microstructure and the way in which plasticity is mediated prior to localization. Both aspects can fundamentally change in a face-centered cubic metal when it becomes nanostructured; the propensity for deformation twinning increases and the behavior is dominated by dislocation interface interactions. Here we carry out a transmission electron microscopy investigation to elucidate the collaborative role of deformation twinning and dislocation transmission on the onset of strain localization in nanolayered composites. Two material systems are examined, Cu-Ag and Cu-Nb, and for each system, two interface structures are examined, one prone to dislocation transmission and the other not. We show that dislocation transmission favors crystallographic band formation, whereas dislocations that do not transmit cause interface tilting and are associated with (non-crystallographic) shear band formation. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：282 / 291

页数：10

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