Plastic anisotropy and associated deformation mechanisms in nanotwinned metals

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	Plastic anisotropy and associated deformation mechanisms in nanotwinned metals
	Z. S. You; X. Y. Li; L. J. Gui; Q. H. Lu; T. Zhu; H. J. Gao; L. Lu
	2013
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	61 期号:1 页码:217-227
摘要	Anisotropic plastic deformation in columnar-grained copper in which preferentially oriented nanoscale twins are embedded is studied by experimental testing, crystal plasticity modeling and molecular dynamics simulations. The dominant deformation mechanism can be effectively switched among three dislocation modes, namely dislocation glide in between the twins, dislocation transfer across twin boundaries, and dislocation-mediated boundary migration, by changing the loading orientation with respect to the twin planes. The controllable switching of deformation mechanisms not only leads to a marked dependence of yield strength on loading orientation, but also induces a strong orientation dependence of strain hardening that can be critical for retaining tensile ductility. These results demonstrate a new route for tailoring both nanostructure and loading to control the deformation mechanisms in order to achieve the desired mechanical properties in engineering materials. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	[you, zesheng ; lu, qiuhong ; lu, lei] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [li, xiaoyan ; gao, huajian] brown univ, sch engn, providence, ri 02912 usa. [gui, liangjin ; zhu, ting] georgia inst & technol, george w woodruff sch mech engn, atlanta, ga 30332 usa. [gui, liangjin] tsinghua univ, dept automot engn, beijing 100084, peoples r china. ; zhu, t (reprint author), georgia inst & technol, george w woodruff sch mech engn, atlanta, ga 30332 usa. ; ting.zhu@me.gatech.edu ; huajian_gao@brown.edu ; llu@imr.ac.cn
关键词	Nanoscale Twins Cu Orientation Effect Anisotropy Deformation Mechanisms Molecular-dynamics Simulation Coherent Twin Boundaries Centered-cubic Metals Nanoscale Twins Flow-stress Grain-size Nanocrystalline Materials Tensile Deformation Maximum Strength Rate Sensitivity
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语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/71651
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. S. You,X. Y. Li,L. J. Gui,et al. Plastic anisotropy and associated deformation mechanisms in nanotwinned metals[J]. Acta Materialia,2013,61(1):217-227.
APA	Z. S. You.,X. Y. Li.,L. J. Gui.,Q. H. Lu.,T. Zhu.,...&L. Lu.(2013).Plastic anisotropy and associated deformation mechanisms in nanotwinned metals.Acta Materialia,61(1),217-227.
MLA	Z. S. You,et al."Plastic anisotropy and associated deformation mechanisms in nanotwinned metals".Acta Materialia 61.1(2013):217-227.