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Dependence of dislocation structure on orientation and slip systems in highly oriented nanotwinned Cu
Lu, Qiuhong; You, Zesheng; Huang, Xiaoxu; Hansen, Niels; Lu, Lei; Lu, L (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China.
2017-04-01
Source PublicationACTA MATERIALIA
ISSN1359-6454
Volume127Pages:85-97
AbstractTo explore the correlation between orientation, active slip systems and dislocation structure, highly oriented nanotwinned Cu has been deformed in compression to 2% and 6% strain. The compression directions are 90(circle), 0(circle) and 45(circle) with respect to the twin boundaries (TBs) of the almost parallel twins. The dislocation structures are analyzed by the two-beam diffraction imaging in a transmission electron microscope and by a Schmid factor analysis. In structures deformed at 90(circle) a high density of long straight dislocation lines with both slip plane and Burgers vectors inclined to the twin plane (slip Mode I) are Observed; they transmit across multiple TBs at a strain of 2% and form a high density of dislocations on TBs at a strain of 6%. In structures deformed at 0(circle) dislocations with Burgers vectors parallel to the twin plane (slip Mode II) are confined within Twin/Matrix lamellae and the analysis shows that both slip Mode I and II are active with dominance of Mode II. In structures deformed at 45(circle) dislocations from slip Modes I, II and III are identified, where Mode III dislocations consist of partial dislocations moving along the TBs and full dislocations inside the twin lamellae gliding on the slip planes parallel to the twin plane. The analysis of the dislocation structures illustrate the strong correlation between active slip systems and the dislocation structure and the strong effect of slip mode anisotropy on both the flow stress and strain hardening rate of nanotwinned Cu. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.; To explore the correlation between orientation, active slip systems and dislocation structure, highly oriented nanotwinned Cu has been deformed in compression to 2% and 6% strain. The compression directions are 90(circle), 0(circle) and 45(circle) with respect to the twin boundaries (TBs) of the almost parallel twins. The dislocation structures are analyzed by the two-beam diffraction imaging in a transmission electron microscope and by a Schmid factor analysis. In structures deformed at 90(circle) a high density of long straight dislocation lines with both slip plane and Burgers vectors inclined to the twin plane (slip Mode I) are Observed; they transmit across multiple TBs at a strain of 2% and form a high density of dislocations on TBs at a strain of 6%. In structures deformed at 0(circle) dislocations with Burgers vectors parallel to the twin plane (slip Mode II) are confined within Twin/Matrix lamellae and the analysis shows that both slip Mode I and II are active with dominance of Mode II. In structures deformed at 45(circle) dislocations from slip Modes I, II and III are identified, where Mode III dislocations consist of partial dislocations moving along the TBs and full dislocations inside the twin lamellae gliding on the slip planes parallel to the twin plane. The analysis of the dislocation structures illustrate the strong correlation between active slip systems and the dislocation structure and the strong effect of slip mode anisotropy on both the flow stress and strain hardening rate of nanotwinned Cu. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
description.department[lu, qiuhong ; you, zesheng ; lu, lei] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china ; [you, zesheng] nanjing univ sci & technol, herbert gleiter inst nanosci, 200 xiaolingwei st, nanjing 210094, jiangsu, peoples r china ; [huang, xiaoxu ; hansen, niels] tech univ denmark, dept wind energy, sect mat sci & adv characterizat, riso campus, dk-4000 roskilde, denmark
KeywordNanotwinned Cu Slip System Dislocation Structure Tem Two-beam Diffraction
Subject AreaMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationNational Basic Research Program of China (973 Program) [2012CB932202]; National Natural Science Foundation of China [51420105001, 51371171, 51101163]; Key Research Program of Frontier Sciences, CAS; Danish National Research Foundation [DNRF86-5]; Natural Science Foundation of China [51261130091]; Danish-Chinese Center for Nanometals
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78208
Collection中国科学院金属研究所
Corresponding AuthorLu, L (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China.
Recommended Citation
GB/T 7714
Lu, Qiuhong,You, Zesheng,Huang, Xiaoxu,et al. Dependence of dislocation structure on orientation and slip systems in highly oriented nanotwinned Cu[J]. ACTA MATERIALIA,2017,127:85-97.
APA Lu, Qiuhong,You, Zesheng,Huang, Xiaoxu,Hansen, Niels,Lu, Lei,&Lu, L .(2017).Dependence of dislocation structure on orientation and slip systems in highly oriented nanotwinned Cu.ACTA MATERIALIA,127,85-97.
MLA Lu, Qiuhong,et al."Dependence of dislocation structure on orientation and slip systems in highly oriented nanotwinned Cu".ACTA MATERIALIA 127(2017):85-97.
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