| Two opposite size effects of hardness at real nano-scale and their distinct origins |
| Yang R(杨荣) ; Zhang Q(张群); Xiao P(肖攀); Wang J(王军); Bai YL(白以龙); Yang, R (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China.
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| 发表期刊 | SCIENTIFIC REPORTS
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| 2017-11-01
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| 卷号 | 7 |
| ISSN | 2045-2322
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| 摘要 | Although it has been well known that hardness of metals obtained with conical indenter remains a constant of about 3 times yield strength in conventional tests, and hardness will show a size effect of increasing hardness with decreasing indentation depth in micro-scale beyond 100 nm, the nano-indentation hardness experiments within 100 nm indentation depth usually show a large deviation and unclear trends. We report the cross-validated experimental and numerical results of two opposite depth-dependences of hardness at real nano-scale. That is to say, the indentation size effect (ISE) of hardness of single-crystal copper shows a rapid increase and then a slow decrease with increasing indentation depth within 100 nm depth. All of the results were coss-checked by means of both elaborated nano-indentation experiments with calibrated indenter tips and large scale molecular dynamics (MD) simulations. Further analysis of the MD results and experimental data reveal that the two opposite ISE of nano-hardness should be attributed to the finite roundness of the indenter tip and the intrinsic transition governing property of the material. |
| DOI | 10.1038/s41598-017-14734-w
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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:000416118900019
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| 关键词[WOS] | STRAIN GRADIENT PLASTICITY
; INDENTATION SIZE
; SURFACE-ROUGHNESS
; NANOINDENTATION
; WORK
; DEFORMATION
; DEPENDENCE
; INDENTER
; STRENGTH
; MODEL
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| WOS研究方向 | Science & Technology - Other Topics
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| WOS类目 | Multidisciplinary Sciences
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| 论文分区 | 一类
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| 力学所作者排名 | 1
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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/311007/72127
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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 | Yang, R (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China. |
推荐引用方式
GB/T 7714 |
Yang R,Zhang Q,Xiao P,et al. Two opposite size effects of hardness at real nano-scale and their distinct origins[J]. SCIENTIFIC REPORTS,2017,7.
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| APA |
杨荣,张群,肖攀,王军,白以龙,&Yang, R .(2017).Two opposite size effects of hardness at real nano-scale and their distinct origins.SCIENTIFIC REPORTS,7.
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| MLA |
杨荣,et al."Two opposite size effects of hardness at real nano-scale and their distinct origins".SCIENTIFIC REPORTS 7(2017).
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