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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.
2017-11-01
发表期刊SCIENTIFIC REPORTS
卷号7
ISSN2045-2322
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.
DOI10.1038/s41598-017-14734-w
收录类别SCI ; EI
语种英语
WOS记录号WOS:000416118900019
关键词[WOS]STRAIN GRADIENT PLASTICITY ; INDENTATION SIZE ; SURFACE-ROUGHNESS ; NANOINDENTATION ; WORK ; DEFORMATION ; DEPENDENCE ; INDENTER ; STRENGTH ; MODEL
WOS研究方向Science & Technology - Other Topics
WOS类目Multidisciplinary Sciences
论文分区一类
力学所作者排名1
引用统计
文献类型期刊论文
条目标识符http://dspace.imech.ac.cn/handle/311007/72127
专题非线性力学国家重点实验室
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.
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.
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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