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Size effects of lamellar twins on the strength and deformation mechanisms of nanocrystalline hcp cobalt
Wang W(王雯); Yuan FP(袁福平); Jiang P(姜萍); Wu XL(武晓雷); Yuan, FP (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
Source PublicationSCIENTIFIC REPORTS
2017-08-25
Volume7Pages:10.1038/s41598-017-09919-2
ISSN2045-2322
Abstract

Twins play an important role in the deformation of nanocrystalline (NC) metals. The size effects of {10 (1) over bar2} tensile/{10 (1) over bar1} compressive lamellar twins on the tensile strength and deformation mechanisms of NC hcp cobalt have been investigated by a series of large-scale molecular dynamics simulations. Unlike the size effects of twins on the strength for polycrystalline fcc metals, the strength of NC hcp cobalt with lamellar tensile/compressive twins monotonically increases with decreasing twin boundary spacing (TBS) and no softening stage is observed, which is due to the consistent deformation mechanisms no matter TBS is large or small. These consistent deformation mechanisms can be categorized into four types of strengthening mechanisms: (i) Partial basal dislocations nucleated from grain boundaries (GBs) or twin boundaries (TBs) intersecting with TBs/GBs; (ii) Phase transformation from hcp to fcc; (iii) < c + a> partial edge dislocations nucleated from TBs intersecting with basal partial dislocations; (iv) Growth of the newly formed secondary tensile twins inside the primary compressive/tensile twins. The observed multiple twinning in MD simulations has also been confirmed by TEM after tensile testing in NC cobalt processed by severe plastic deformation.

DOI10.1038/s41598-017-09919-2
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Indexed BySCI
Language英语
WOS IDWOS:000408449000029
WOS KeywordHIGH-TENSILE DUCTILITY ; MOLECULAR-DYNAMICS SIMULATION ; SEVERE PLASTIC-DEFORMATION ; ULTRAHIGH STRENGTH ; METALS ; COPPER ; MAXIMUM ; NICKEL
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
Funding OrganizationNational Key R&D Program of China(2017YFA0204402) ; Natural Science Foundation of China(11472286 ; Strategic Priority Research Program of the Chinese Academy of Sciences(XDB22040503) ; 11672313 ; 11572328)
DepartmentLNM材料介观力学性能的表征
Classification一类
Ranking1
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/70055
Collection非线性力学国家重点实验室
Corresponding AuthorYuan, FP (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Wang W,Yuan FP,Jiang P,et al. Size effects of lamellar twins on the strength and deformation mechanisms of nanocrystalline hcp cobalt[J]. SCIENTIFIC REPORTS,2017,7:10.1038/s41598-017-09919-2.
APA Wang W,Yuan FP,Jiang P,Wu XL,&Yuan, FP .(2017).Size effects of lamellar twins on the strength and deformation mechanisms of nanocrystalline hcp cobalt.SCIENTIFIC REPORTS,7,10.1038/s41598-017-09919-2.
MLA Wang W,et al."Size effects of lamellar twins on the strength and deformation mechanisms of nanocrystalline hcp cobalt".SCIENTIFIC REPORTS 7(2017):10.1038/s41598-017-09919-2.
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