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Smaller critical size and enhanced strength by nano-laminated structure in nickel
Wang W; Yuan FP(袁福平); 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 PublicationComputational Materials Science
2015-12
Volume110Pages:83-90
ISSN0927-0256
AbstractBecause of a shift in the dominant deformation mechanisms, the strength/hardness of metals increases with decreasing grain size down to a critical value, then decreases with further grain refinement. Here, laminated structure with low-angle grain boundaries was found to have smaller critical size and enhanced strength when compared to the equiaxed grain structure, through a series of large-scale molecular dynamics simulations. Then, the corresponding atomistic mechanisms were investigated by checking and comparing the rotations of grains and equivalent strain partitioning in grain boundary atoms. In laminated structure, grain boundary activies were found to be promoted with decreasing lamellar thickness. More importantly, when compared to the equiaxed grain structure at the same length scale (lamellar thickness/grain size), grain boundary activities were found to be inhibited by the laminated structure, which is the main reason for the enhanced strength and the smaller critical size. Besides grain boundary activities, formation of extended dislocations, formation of deformation twins, partial dislocations interacting with formed TBs, partial dislocation blocking by and even transmission through low-angle grain boundaries were also found to play important roles in plastic deformation of nano-laminated structure. The current findings should provide insights for designing stronger and more stable nanostructured metals. (C) 2015 Elsevier B.V. All rights reserved.
KeywordMolecular Dynamics Dislocations Grain Boundaries Laminated Structure Equiaxed Grain Structure
DOI10.1016/j.commatsci.2015.08.001
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000362010800011
WOS KeywordMOLECULAR-DYNAMICS ; NANOCRYSTALLINE MATERIALS ; DEFORMATION MECHANISMS ; METALLIC MULTILAYERS ; LATTICE DISLOCATIONS ; GRAIN-BOUNDARIES ; MAXIMUM STRENGTH ; ATOMIC-SCALE ; COPPER ; ALUMINUM
WOS Research AreaMaterials Science
WOS SubjectMaterials Science, Multidisciplinary
Funding OrganizationThis work was supported by the NSFC under Grants No. 11222224, No. 11472286, and No. 11021262 ; and the National Key Basic Research Program of China under Grants No. 2012CB932203 and No. 2012CB937500. The simulations reported in the present study 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/Q2
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/58335
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,Wu XL,et al. Smaller critical size and enhanced strength by nano-laminated structure in nickel[J]. Computational Materials Science,2015,110:83-90.
APA Wang W,袁福平,武晓雷,&Yuan, FP .(2015).Smaller critical size and enhanced strength by nano-laminated structure in nickel.Computational Materials Science,110,83-90.
MLA Wang W,et al."Smaller critical size and enhanced strength by nano-laminated structure in nickel".Computational Materials Science 110(2015):83-90.
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