Size effect and atomistic deformation mechanisms of hierarchically nanotwinned fcc metals under nanoindentation

doi:10.1007/s10853-015-9310-8

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	Size effect and atomistic deformation mechanisms of hierarchically nanotwinned fcc metals under nanoindentation
	Yuan FP(袁福平); Wu XL(武晓雷); Yuan, FP (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, 15,North 4th Ring,West Rd, Beijing 100190, Peoples R China.
发表期刊	Journal of Materials Science
	2015-12
卷号	50 期号:23 页码:7557-7567
ISSN	0022-2461
摘要	Molecular dynamics simulations have been performed to investigate the atomistic deformation mechanisms of hierarchically nanotwinned Cu under nanoindentation. When the grain size (d) and the spacing of primary twins (lambda (1)) are fixed, the hardness is observed to increase with decreasing spacing of secondary twins (lambda (2)) until a critical lambda (2), and then decrease with further decreasing lambda (2). The size effect of lambda (2) on the plastic area beneath the indenter is observed to be exactly opposite to the trend of the size effect on the hardness. There exist two plastic zones beneath the indenter: the severe plastic zone and the moderate plastic zone. In the severe plastic zone, high density of dislocation networks are observed and the deformation mechanisms are independent of lambda (2). The deformation mechanisms in the moderate plastic zone are highly dependent on the lambda (2), which is the origin of the size effect on the hardness. Below the critical lambda (2), the deformation mechanisms are dominated by the softening mechanisms with decreasing lambda (2): (i) detwinning of secondary twins and (ii) nucleation and propagation of partial dislocations with a small angle to the boundaries of secondary twins. Above the critical lambda (2), the deformation mechanisms are dominated by the strengthening mechanisms with decreasing lambda (2): partial dislocations are blocked by the boundaries of primary twins or secondary twins.
DOI	10.1007/s10853-015-9310-8
URL	查看原文
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000361526200004
关键词[WOS]	MOLECULAR-DYNAMICS SIMULATION ; FUNCTIONALLY GRADED MATERIALS ; CENTERED-CUBIC METALS ; NANOCRYSTALLINE MATERIALS ; ATTRITION TREATMENT ; MAXIMUM STRENGTH ; HIGH-DUCTILITY ; COPPER ; TWINS ; REFINEMENT
WOS研究方向	Materials Science
WOS类目	Materials Science, Multidisciplinary
项目资助者	The authors would like to thank the financial support by National Natural Science Foundation of China (Nos. 11222224, 11472286 and 11021262) and National Key Basic Research Program of China (Grants Nos. 2012CB932203 and 2012CB937500). The simulations reported in the present work were performed at Supercomputing Center of Chinese Academy of Sciences.
课题组名称	LNM材料介观力学性能的表征
论文分区	二类/Q1
引用统计	被引频次：21[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/58334
专题	非线性力学国家重点实验室
通讯作者	Yuan, FP (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, 15,North 4th Ring,West Rd, Beijing 100190, Peoples R China.
推荐引用方式 GB/T 7714	Yuan FP,Wu XL,Yuan, FP . Size effect and atomistic deformation mechanisms of hierarchically nanotwinned fcc metals under nanoindentation[J]. Journal of Materials Science,2015,50,23,:7557-7567.
APA	袁福平,武晓雷,&Yuan, FP .(2015).Size effect and atomistic deformation mechanisms of hierarchically nanotwinned fcc metals under nanoindentation.Journal of Materials Science,50(23),7557-7567.
MLA	袁福平,et al."Size effect and atomistic deformation mechanisms of hierarchically nanotwinned fcc metals under nanoindentation".Journal of Materials Science 50.23(2015):7557-7567.

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