Fracture in a thin film of nanotwinned copper
Zeng, Zhi; Li, Xiaoyan; Lu, Lei; Zhu, Ting;
Source PublicationACTA MATERIALIA
AbstractNanotwinned 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.
description.department[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
KeywordNanotwinned Cu Fracture Molecular Dynamics Dislocation-induced Thinning
Funding OrganizationNSFC [51420105001, 11372152]; NSF [DMR-1410331]; National Basic Research Program of China (973 Program) [2012CB932202]; Chinese Academy of Sciences
Indexed Bysci
Document Type期刊论文
Recommended Citation
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,& 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.
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