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Title:
Two opposite size effects of hardness at real nano-scale and their distinct origins
Author: Yang R(杨荣); Zhang Q(张群); Xiao P(肖攀); Wang J(王军); Bai YL(白以龙)
Source: SCIENTIFIC REPORTS
Issued Date: 2017-11-01
Volume: 7
Abstract: 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.
Language: 英语
Indexed Type: SCI ; EI
Corresponding Author: Yang, R (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China.
Correspondent Email: yangr@lnm.imech.ac.cn
DOI: 10.1038/s41598-017-14734-w
DOC Type: Article
WOS Subject: Multidisciplinary Sciences
WOS Subject Extended: Science & Technology - Other Topics
WOS Keyword Plus: STRAIN GRADIENT PLASTICITY ; INDENTATION SIZE ; SURFACE-ROUGHNESS ; NANOINDENTATION ; WORK ; DEFORMATION ; DEPENDENCE ; INDENTER ; STRENGTH ; MODEL
WOS ID: WOS:000416118900019
ISSN: 2045-2322
Rank: [Yang, Rong; Zhang, Qun; Xiao, Pan; Wang, Jun; Bai, Yilong] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China
Classification: 一类
Ranking: 1
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/72127
Appears in Collections:非线性力学国家重点实验室_期刊论文

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Recommended Citation:
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,2017-11-01,7.
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