Atomistic scale fracture behaviours in hierarchically nanotwinned metals | |
Yuan FP(袁福平); Wu XL(武晓雷); Yuan, FP (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China. | |
Source Publication | PHILOSOPHICAL MAGAZINE |
2013-08-01 | |
Volume | 93Issue:24Pages:3248-3259 |
ISSN | 1478-6435 |
Abstract | In the present study, a series of large-scale molecular dynamics simulations have been performed to investigate the atomistic scale fracture behaviours along the boundaries of primary twins in Cu with hierarchically nanotwinned structures (HTS), and compare their fracture behaviours with those in monolithic twins. The results indicate that crack propagation along [112] on the twin plane in monolithic nanotwins is brittle cleavage and fracture, resulting in low crack resistance and fracture toughness. However, the crack resistance along the boundaries of primary twins in HTS is much higher, and a smaller spacing of secondary twins (λ2) leads to even higher fracture toughness. With large λ2, the crack growth is achieved by void nucleation, growth and coalescence. However, considerable plastic deformation and enhanced fracture toughness in HTS could be achieved by the crack blunting and by the extensive dislocation accommodation ahead of the crack tip when λ2 is small. |
Keyword | Molecular Dynamics Simulations Fracture Crack Growth Twins Hierarchically Nanotwinned Structures |
Subject Area | 损伤、破坏机理和微结构演化 |
URL | 查看原文 |
Indexed By | SCI ; EI |
Language | 英语 |
WOS ID | WOS:000323633100002 |
Funding Organization | National Key Basic Research Program of China [2012CB932203, 2012CB937500]; NSFC [11002151, 11222224, 11072243, 11021262] |
Department | LNM材料介观力学性能的表征 |
Classification | 一类 |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://dspace.imech.ac.cn/handle/311007/47457 |
Collection | 非线性力学国家重点实验室 |
Corresponding Author | Yuan, FP (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China. |
Recommended Citation GB/T 7714 | Yuan FP,Wu XL,Yuan, FP . Atomistic scale fracture behaviours in hierarchically nanotwinned metals[J]. PHILOSOPHICAL MAGAZINE,2013,93,24,:3248-3259. |
APA | Yuan FP,Wu XL,&Yuan, FP .(2013).Atomistic scale fracture behaviours in hierarchically nanotwinned metals.PHILOSOPHICAL MAGAZINE,93(24),3248-3259. |
MLA | Yuan FP,et al."Atomistic scale fracture behaviours in hierarchically nanotwinned metals".PHILOSOPHICAL MAGAZINE 93.24(2013):3248-3259. |
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