Discrete plasticity in sub-10-nm-sized gold crystals

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	Discrete plasticity in sub-10-nm-sized gold crystals
	H. Zheng; A. J. Cao; C. R. Weinberger; J. Y. Huang; K. Du; J. B. Wang; Y. Y. Ma; Y. N. Xia; S. X. Mao
	2010
发表期刊	Nature Communications
ISSN	2041-1723
卷号	1
摘要	Although deformation processes in submicron-sized metallic crystals are well documented, the direct observation of deformation mechanisms in crystals with dimensions below the sub-10-nm range is currently lacking. Here, through in situ high-resolution transmission electron microscopy (HRTEM) observations, we show that (1) in sharp contrast to what happens in bulk materials, in which plasticity is mediated by dislocation emission from Frank-Read sources and multiplication, partial dislocations emitted from free surfaces dominate the deformation of gold (Au) nanocrystals; (2) the crystallographic orientation (Schmid factor) is not the only factor in determining the deformation mechanism of nanometre-sized Au; and (3) the Au nanocrystal exhibits a phase transformation from a face-centered cubic to a body-centered tetragonal structure after failure. These findings provide direct experimental evidence for the vast amount of theoretical modelling on the deformation mechanisms of nanomaterials that have appeared in recent years.
部门归属	[huang, jian yu] sandia natl labs, ctr integrated nanotechnol, albuquerque, nm 87185 usa. [zheng, he; mao, scott x.] univ pittsburgh, dept mech engn & mat sci, pittsburgh, pa 15261 usa. [zheng, he; wang, jianbo] wuhan univ, sch phys & technol, ctr electron microscopy, wuhan 430072, peoples r china. [zheng, he; wang, jianbo] wuhan univ, moe key lab artificial micro & nanostruct, wuhan 430072, peoples r china. [cao, ajing] northwestern univ, dept civil & environm engn, evanston, il 60208 usa. [weinberger, christopher r.] sandia natl labs, mat sci & engn ctr, albuquerque, nm 87185 usa. [du, kui] cas, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. [ma, yanyun; xia, younan] washington univ, dept biomed engn, st louis, mo 63130 usa.;huang, jy (reprint author), sandia natl labs, ctr integrated nanotechnol, pob 5800, albuquerque, nm 87185 usa;jhuang@sandia.gov smao@engr.pitt.edu
关键词	Transmission Electron-microscopy Nanowires Deformation Strain Scale Strength
URL	查看原文
WOS记录号	WOS:000288225300012
引用统计	被引频次：317[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/31754
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	H. Zheng,A. J. Cao,C. R. Weinberger,et al. Discrete plasticity in sub-10-nm-sized gold crystals[J]. Nature Communications,2010,1.
APA	H. Zheng.,A. J. Cao.,C. R. Weinberger.,J. Y. Huang.,K. Du.,...&S. X. Mao.(2010).Discrete plasticity in sub-10-nm-sized gold crystals.Nature Communications,1.
MLA	H. Zheng,et al."Discrete plasticity in sub-10-nm-sized gold crystals".Nature Communications 1(2010).