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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 PublicationPHILOSOPHICAL MAGAZINE
2013-08-01
Volume93Issue:24Pages:3248-3259
ISSN1478-6435
AbstractIn 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.
KeywordMolecular Dynamics Simulations Fracture Crack Growth Twins Hierarchically Nanotwinned Structures
Subject Area损伤、破坏机理和微结构演化
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000323633100002
Funding OrganizationNational Key Basic Research Program of China [2012CB932203, 2012CB937500]; NSFC [11002151, 11222224, 11072243, 11021262]
DepartmentLNM材料介观力学性能的表征
Classification一类
Citation statistics
Cited Times:20[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/47457
Collection非线性力学国家重点实验室
Corresponding AuthorYuan, 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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