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Size effect and atomistic deformation mechanisms of hierarchically nanotwinned fcc metals under nanoindentation
Yuan FP(袁福平); Wu XL(武晓雷); Yuan, FP (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, 15,North 4th Ring,West Rd, Beijing 100190, Peoples R China.
Source PublicationJournal of Materials Science
2015-12
Volume50Issue:23Pages:7557-7567
ISSN0022-2461
AbstractMolecular dynamics simulations have been performed to investigate the atomistic deformation mechanisms of hierarchically nanotwinned Cu under nanoindentation. When the grain size (d) and the spacing of primary twins (lambda (1)) are fixed, the hardness is observed to increase with decreasing spacing of secondary twins (lambda (2)) until a critical lambda (2), and then decrease with further decreasing lambda (2). The size effect of lambda (2) on the plastic area beneath the indenter is observed to be exactly opposite to the trend of the size effect on the hardness. There exist two plastic zones beneath the indenter: the severe plastic zone and the moderate plastic zone. In the severe plastic zone, high density of dislocation networks are observed and the deformation mechanisms are independent of lambda (2). The deformation mechanisms in the moderate plastic zone are highly dependent on the lambda (2), which is the origin of the size effect on the hardness. Below the critical lambda (2), the deformation mechanisms are dominated by the softening mechanisms with decreasing lambda (2): (i) detwinning of secondary twins and (ii) nucleation and propagation of partial dislocations with a small angle to the boundaries of secondary twins. Above the critical lambda (2), the deformation mechanisms are dominated by the strengthening mechanisms with decreasing lambda (2): partial dislocations are blocked by the boundaries of primary twins or secondary twins.
DOI10.1007/s10853-015-9310-8
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000361526200004
WOS KeywordMOLECULAR-DYNAMICS SIMULATION ; FUNCTIONALLY GRADED MATERIALS ; CENTERED-CUBIC METALS ; NANOCRYSTALLINE MATERIALS ; ATTRITION TREATMENT ; MAXIMUM STRENGTH ; HIGH-DUCTILITY ; COPPER ; TWINS ; REFINEMENT
WOS Research AreaMaterials Science
WOS SubjectMaterials Science, Multidisciplinary
Funding OrganizationThe authors would like to thank the financial support by National Natural Science Foundation of China (Nos. 11222224, 11472286 and 11021262) and National Key Basic Research Program of China (Grants Nos. 2012CB932203 and 2012CB937500). The simulations reported in the present work were performed at Supercomputing Center of Chinese Academy of Sciences.
DepartmentLNM材料介观力学性能的表征
Classification二类/Q1
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/58334
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, 15,North 4th Ring,West Rd, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Yuan FP,Wu XL,Yuan, FP . Size effect and atomistic deformation mechanisms of hierarchically nanotwinned fcc metals under nanoindentation[J]. Journal of Materials Science,2015,50(23):7557-7567.
APA 袁福平,武晓雷,&Yuan, FP .(2015).Size effect and atomistic deformation mechanisms of hierarchically nanotwinned fcc metals under nanoindentation.Journal of Materials Science,50(23),7557-7567.
MLA 袁福平,et al."Size effect and atomistic deformation mechanisms of hierarchically nanotwinned fcc metals under nanoindentation".Journal of Materials Science 50.23(2015):7557-7567.
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