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Anisotropic size effect in strength in coherent nanowires with tilted twins
Wei YJ(魏宇杰); Wei, YJ (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
Source PublicationPhysical Review B
2011
Volume84Issue:1Pages:14107
ISSN1098-0121
AbstractWhen materials are deformed plastically via dislocations, a general finding is that samples with smaller dimensions exhibit higher strengths but with very limited amount of plasticity in tension. Here we report that one-dimensional coherent nanostructures with tilted internal twins exhibit anisotropic size effect: their strengths show no apparent change if only their thicknesses reduce, but become stronger as the sample sizes are reduced proportionally. Large-scale molecular dynamics simulations show that such nanowires deform primarily through twin migration mediated by partial dislocations in one active slip system, and a large amount of plasticity could be achieved in such nanowires via twin migration. The unique structure shown here is suitable to explore strengthening mechanisms in metals when plasticity is controlled by a single dislocation slip system. This study also suggests a novel approach to modulate strength and ductility in one-dimensional coherent nanostructures.
KeywordSingle-crystal Mechanical-properties Molecular-dynamics Maximum Strength Gold Nanowires Deformation Metals Copper Microcompression Plasticity
Subject AreaPhysics
DOI10.1103/PhysRevB.84.014107
URL查看原文
Indexed BySCI
Language英语
WOS IDWOS:000293004800001
WOS KeywordSINGLE-CRYSTAL ; MECHANICAL-PROPERTIES ; MOLECULAR-DYNAMICS ; MAXIMUM STRENGTH ; GOLD NANOWIRES ; DEFORMATION ; METALS ; COPPER ; MICROCOMPRESSION ; PLASTICITY
WOS Research AreaPhysics
WOS SubjectPhysics, Condensed Matter
Funding OrganizationThe author is very grateful to Huajian Gao and Allan F. Bower of Brown University for fruitful discussions. This work was supported in part by the Hundred Talent Program and by NSFC No. 11021262. Computation was supported by the Super Computing Center of CAS and the Institute of Mechanics.
DepartmentLNM微结构计算力学(筹)
Classification二类/Q1
Citation statistics
Cited Times:23[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/44918
Collection非线性力学国家重点实验室
Corresponding AuthorWei, YJ (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Wei YJ,Wei, YJ . Anisotropic size effect in strength in coherent nanowires with tilted twins[J]. Physical Review B,2011,84(1):14107.
APA 魏宇杰,&Wei, YJ .(2011).Anisotropic size effect in strength in coherent nanowires with tilted twins.Physical Review B,84(1),14107.
MLA 魏宇杰,et al."Anisotropic size effect in strength in coherent nanowires with tilted twins".Physical Review B 84.1(2011):14107.
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