IMECH-IR  > 非线性力学国家重点实验室
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.
Source PublicationSCIENTIFIC REPORTS
2017-11-01
Volume7Pages:16053
ISSN2045-2322
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.

DOI10.1038/s41598-017-14734-w
Indexed BySCI
Language英语
WOS IDWOS:000416118900019
WOS KeywordSTRAIN GRADIENT PLASTICITY ; INDENTATION SIZE ; SURFACE-ROUGHNESS ; NANOINDENTATION ; WORK ; DEFORMATION ; DEPENDENCE ; INDENTER ; STRENGTH ; MODEL
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
Classification一类
Ranking1
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/72127
Collection非线性力学国家重点实验室
Corresponding AuthorYang, 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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