| 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.
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| 发表期刊 | Computational Materials Science
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| 2015-12
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| 卷号 | 110页码:83-90 |
| ISSN | 0927-0256
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| 摘要 | Because 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. |
| 关键词 | Molecular Dynamics
Dislocations
Grain Boundaries
Laminated Structure
Equiaxed Grain Structure
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| DOI | 10.1016/j.commatsci.2015.08.001
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| URL | 查看原文
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| 收录类别 | SCI
; EI
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| 语种 | 英语
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| WOS记录号 | WOS:000362010800011
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| 关键词[WOS] | MOLECULAR-DYNAMICS
; NANOCRYSTALLINE MATERIALS
; DEFORMATION MECHANISMS
; METALLIC MULTILAYERS
; LATTICE DISLOCATIONS
; GRAIN-BOUNDARIES
; MAXIMUM STRENGTH
; ATOMIC-SCALE
; COPPER
; ALUMINUM
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| WOS研究方向 | Materials Science
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| WOS类目 | Materials Science, Multidisciplinary
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| 项目资助者 | This 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.
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| 课题组名称 | LNM材料介观力学性能的表征
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| 论文分区 | 二类/Q2
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| 引用统计 |
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| 文献类型 | 期刊论文
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| 条目标识符 | http://dspace.imech.ac.cn/handle/311007/58335
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| 专题 | 非线性力学国家重点实验室
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| 通讯作者 | Yuan, FP (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China. |
推荐引用方式
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.
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| 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.
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| 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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