期刊
ACTA MATERIALIA
卷 79, 期 -, 页码 282-291出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2014.07.017
关键词
Interfaces; Twinning; Shear bands; Nanolayered composites; TEM
资金
- Center for Materials at Irradiation and Mechanical Extremes, an Energy Frontier Research Center - US Department of Energy, Office of Science, Office of Basic Energy Sciences [2008LANL1026]
- National Nuclear Security Administration of the US Department of Energy [DE-AC52-06NA25396]
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据