Fracture in a thin film of nanotwinned copper

IMR OpenIR

	Fracture in a thin film of nanotwinned copper
	Zeng, Zhi; Li, Xiaoyan; Lu, Lei; Zhu, Ting; ting.zhu@me.gatech.edu
	2015
发表期刊	ACTA MATERIALIA
ISSN	1359-6454
卷号	98 页码:313-317
摘要	Nanotwinned Cu exhibits an unusual combination of ultra-high strength and high tensile ductility. However, its fracture behavior and associated microscopic mechanisms remain largely unexplored. Here we study the fracture in a free-standing thin film of nanotwinned Cu using molecular dynamics (MD) simulations. For a pre-crack inclined to the twin boundary, MD simulations show a characteristic fracture mode of zigzag cracking, which arises due to periodic deflections of the crack path by twin boundaries. The mechanism of fracture involves the screw dislocation-mediated local thinning ahead of the crack, instead of cleavage fracture. Importantly, MD simulations show a unique fracture footprint of < 1 1 0 >-oriented crack edges, consistent with the previous experimental observation from in situ transmission electron microscopy. Our results reveal the toughening mechanisms by nanotwins and also have broader implications for understanding the mechanical failure of metallic thin films. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	[zeng, zhi ; zhu, ting] georgia inst technol, woodruff sch mech engn, atlanta, ga 30332 usa ; [li, xiaoyan] tsinghua univ, dept engn mech, appl mech lab, ctr adv mech & mat, beijing 100084, peoples r china ; [lu, lei] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china
关键词	Nanotwinned Cu Fracture Molecular Dynamics Dislocation-induced Thinning
资助者	NSFC [51420105001, 11372152]; NSF [DMR-1410331]; National Basic Research Program of China (973 Program) [2012CB932202]; Chinese Academy of Sciences
收录类别	sci
语种	英语
WOS记录号	WOS:000361074000031
引用统计	被引频次：58[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/321006/74860
专题	中国科学院金属研究所
通讯作者	ting.zhu@me.gatech.edu
推荐引用方式 GB/T 7714	Zeng, Zhi,Li, Xiaoyan,Lu, Lei,et al. Fracture in a thin film of nanotwinned copper[J]. ACTA MATERIALIA,2015,98:313-317.
APA	Zeng, Zhi,Li, Xiaoyan,Lu, Lei,Zhu, Ting,&ting.zhu@me.gatech.edu.(2015).Fracture in a thin film of nanotwinned copper.ACTA MATERIALIA,98,313-317.
MLA	Zeng, Zhi,et al."Fracture in a thin film of nanotwinned copper".ACTA MATERIALIA 98(2015):313-317.