Twin boundary spacing-dependent friction in nanotwinned copper

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	Twin boundary spacing-dependent friction in nanotwinned copper
	Zhang JJ; Wei YJ(魏宇杰); Sun T; Hartmaier A; Yan YD; Li XD
刊名	PHYSICAL REVIEW B
	2012-02-13
通讯作者邮箱	yujie_wei@lnm.imech.ac.cn;spm@hit.edu.cn
卷号	85 期号:5 页码:054109
关键词	Ultrahigh-Strength Molecular-Dynamics Maximum Strength Rate Sensitivity Metals Ductility Deformation Mechanisms Nanoscale Scale
ISSN号	1098-0121
通讯作者	Zhang, JJ ; Harbin Insitute Technol, Ctr Precis Engn, Harbin 150001, Peoples R China.
产权排序	[Zhang, Junjie;Sun, Tao; Yan, Yongda] Harbin Insitute Technol, Ctr Precis Engn, Harbin 150001, Peoples R China; [Wei, Yujie] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; [Hartmaier, Alexander] Univ Bochum, ICAMS, D-44801 Bochum, Germany; [Li, Xiaodong] Univ S Carolina, Dept Mech Engn, Columbia, SC 29208 USA
合作状况	国际
中文摘要	The deformation mechanisms of nanotwinned Cu subjected to nanoscratching are investigated by means of molecular dynamics simulations. Scratching simulations on nanotwinned single-crystalline Cu with the twin planes parallel and perpendicular to the scratching direction are performed. Since the detwinning mechanism is completely suppressed in the former case, no apparent correlation between frictional coefficient and the twin spacing is observed. In samples where the twin planes are perpendicular to the scratching direction, the friction increases as the twin spacing decreases, and then decreases as the twin spacings become even smaller. It results from the competitive plastic deformation between the inclined dislocations and the detwinning mechanism. Subsequent simulations for nanotwinned polycrystalline Cu unveil that in addition to the grain-boundary-associated deformation mechanism, dislocation-mediated detwinning plays a significant role in the plastic deformation of nanotwinned Cu. The twin boundary spacing in turn affects nanotwinned materials to resist scratching via plastic deformation. We demonstrate via the nanoscratching tests that there exists a critical twin boundary spacing for which the friction coefficient is maximized and that this transition results from the competing deformation mechanisms in those nanotwinned materials.
学科主题	损伤、破坏机理和微结构演化
分类号	二类/Q1
收录类别	SCI
资助信息	J.Z., T.S., and Y.Y. acknowledge the financial support from NSFC (50575058 and 50605012). J.Z. thanks A. Stukowski for his valuable discussion and guidance, and ICAMS for providing computational resources. Y.W. acknowledges support from the 973 Project (2011CB711103) and CAS (KJCX2-EW-L03). A.H. acknowledges financial support through ThyssenKrupp AG, Bayer MaterialScience AG, Salzgitter Mannesmann Forschung GmbH, Robert Bosch GmbH, Benteler Stahl/Rohr GmbH, Bayer Technology Services GmbH, and the state of North Rhine-Westphalia, as well as the European Comission in the framework of the European Regional Development Fund (ERDF).
原文出处	http://dx.doi.org/10.1103/PhysRevB.85.054109
语种	英语
WOS记录号	WOS:000300237800004
公开日期	2013-01-18
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/46722]
专题	力学研究所_非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Zhang JJ,Wei YJ,Sun T,et al. Twin boundary spacing-dependent friction in nanotwinned copper[J]. PHYSICAL REVIEW B,2012,85(5):054109.
APA	Zhang JJ,魏宇杰,Sun T,Hartmaier A,Yan YD,&Li XD.(2012).Twin boundary spacing-dependent friction in nanotwinned copper.PHYSICAL REVIEW B,85(5),054109.
MLA	Zhang JJ,et al."Twin boundary spacing-dependent friction in nanotwinned copper".PHYSICAL REVIEW B 85.5(2012):054109.