Two opposite size effects of hardness at real nano-scale and their distinct origins | |
Yang R(杨荣)![]() ![]() ![]() ![]() ![]() | |
Source Publication | SCIENTIFIC REPORTS
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2017-11-01 | |
Volume | 7Pages:16053 |
ISSN | 2045-2322 |
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. |
DOI | 10.1038/s41598-017-14734-w |
Indexed By | SCI |
Language | 英语 |
WOS ID | WOS:000416118900019 |
WOS Keyword | STRAIN GRADIENT PLASTICITY ; INDENTATION SIZE ; SURFACE-ROUGHNESS ; NANOINDENTATION ; WORK ; DEFORMATION ; DEPENDENCE ; INDENTER ; STRENGTH ; MODEL |
WOS Research Area | Science & Technology - Other Topics |
WOS Subject | Multidisciplinary Sciences |
Classification | 一类 |
Ranking | 1 |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://dspace.imech.ac.cn/handle/311007/72127 |
Collection | 非线性力学国家重点实验室 |
Corresponding Author | Yang, R (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China. |
Recommended Citation 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,2017,7:16053. |
APA | Yang R,Zhang Q,Xiao P,Wang J,Bai YL,&Yang, R .(2017).Two opposite size effects of hardness at real nano-scale and their distinct origins.SCIENTIFIC REPORTS,7,16053. |
MLA | Yang R,et al."Two opposite size effects of hardness at real nano-scale and their distinct origins".SCIENTIFIC REPORTS 7(2017):16053. |
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Jp2017300.pdf(3178KB) | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Download |
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