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Size effects of primary/secondary twins on the atomistic deformation mechanisms in hierarchically nanotwinned metals
Yuan FP(袁福平); Wu XL(武晓雷); Yuan, FP(reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.
Source PublicationJOURNAL OF APPLIED PHYSICS
2013-05-28
Volume113Issue:20Pages:203516/1-203516/6
ISSN0021-8979
AbstractA series of large-scale molecular dynamics simulations have been performed to investigate the tensile properties of nanotwinned (NT) copper with hierarchically twinned structures (HTS). For the same grain size d and the same spacing of primary twins λ1, the average flow stress first increases as the spacing of secondary twins λ2 decreases, reaching a maximum at a critical λ2, and then decreases as λ2 becomes even smaller. The smaller the spacing for λ1, the smaller the critical spacing for λ2. There exists a transition in dominating deformation mechanisms, occurring at a critical spacing of λ2 for which strength is maximized. Above the critical spacing of λ2, the deformation mechanisms are dominated by the two Hall-Petch type strengthening mechanisms: (a) partial dislocations emitted from grain boundaries (GBs) travel across other GBs and twin boundaries (TBs); (b) partial dislocations emitted from TBs travel across other TBs. Below the critical spacing of λ2, the deformation mechanism is dominated by the two softening mechanisms: (a) Partial dislocations emitted from boundaries of the primary twins travel parallel to the TBs of the secondary twins, leading to detwinning of the secondary twins; (b) Boundaries of the primary twins shift entirely, leading to thickening in one part of primary twins and thinning in the other part of primary twins. The present results should provide insights to design the microstructures for reinforcing the mechanical properties in the NT metals with HTS.
KeywordCopper Dislocations Grain Size Hardening Molecular Dynamics Method Plastic Flow Size Effect Softening Twin Boundaries Twinning Yield Stress
Subject Area损伤、破坏机理和微结构演化
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000320132100028
Funding OrganizationNational Key Basic Research Program of China [2012CB932203, 2012CB937500]; NSFC [11002151, 11222224, 11072243, 11021262]
DepartmentLNM材料介观力学性能的表征
Classification二类/Q2
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/47292
Collection非线性力学国家重点实验室
Corresponding AuthorYuan, FP(reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Yuan FP,Wu XL,Yuan, FP. Size effects of primary/secondary twins on the atomistic deformation mechanisms in hierarchically nanotwinned metals[J]. JOURNAL OF APPLIED PHYSICS,2013,113(20):203516/1-203516/6.
APA Yuan FP,Wu XL,&Yuan, FP.(2013).Size effects of primary/secondary twins on the atomistic deformation mechanisms in hierarchically nanotwinned metals.JOURNAL OF APPLIED PHYSICS,113(20),203516/1-203516/6.
MLA Yuan FP,et al."Size effects of primary/secondary twins on the atomistic deformation mechanisms in hierarchically nanotwinned metals".JOURNAL OF APPLIED PHYSICS 113.20(2013):203516/1-203516/6.
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