| Atomistic simulations of crack nucleation and intergranular fracture in bulk nanocrystalline nickel |
| Cao AJ(曹阿静) ; Wei YG(魏悦广); Cao, AJ (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100080, Peoples R China.
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| Source Publication | Physical Review B
(IF:3.736[JCR-2018],3.739[5-Year]) |
| 2007
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| Volume | 76Issue:2Pages:024113 |
| ISSN | 1098-0121
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| Abstract | We report large scale molecular dynamics simulations of dynamic cyclic uniaxial tensile deformation of pure, fully dense nanocrystalline Ni, to reveal the crack initiation, and consequently intergranular fracture is the result of coalescence of nanovoids by breaking atomic bonds at grain boundaries and triple junctions. The results indicate that the brittle fracture behavior accounts for the transition from plastic deformation governed by dislocation to one that is grain-boundary dominant when the grain size reduces to the nanoscale. The grain-boundary mediated plasticity is also manifested by the new grain formation and growth induced by stress-assisted grain-boundary diffusion observed in this work. This work illustrates that grain-boundary decohesion is one of the fundamental deformation mechanisms in nanocrystalline Ni. |
| Keyword | Molecular-dynamics Simulation
Polycrystalline Materials
Plastic-deformation
Tensile Ductility
Metals
Transition
Behavior
Copper
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| DOI | 10.1103/PhysRevB.76.024113
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| Indexed By | SCI
|
| Language | 英语
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| WOS ID | WOS:000248496200033
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| WOS Keyword | MOLECULAR-DYNAMICS SIMULATION
; POLYCRYSTALLINE MATERIALS
; PLASTIC-DEFORMATION
; TENSILE DUCTILITY
; METALS
; TRANSITION
; BEHAVIOR
; COPPER
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| WOS Research Area | Physics
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| WOS Subject | Physics, Condensed Matter
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| Citation statistics |
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| Document Type | 期刊论文
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| Identifier | http://dspace.imech.ac.cn/handle/311007/33933
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| Collection | 力学所知识产出(1956-2008)
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| Corresponding Author | Cao, AJ (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100080, Peoples R China. |
Recommended Citation
GB/T 7714 |
Cao AJ,Wei YG,Cao, AJ . Atomistic simulations of crack nucleation and intergranular fracture in bulk nanocrystalline nickel[J]. Physical Review B,2007,76,2,:024113.
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| APA |
曹阿静,魏悦广,&Cao, AJ .(2007).Atomistic simulations of crack nucleation and intergranular fracture in bulk nanocrystalline nickel.Physical Review B,76(2),024113.
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| MLA |
曹阿静,et al."Atomistic simulations of crack nucleation and intergranular fracture in bulk nanocrystalline nickel".Physical Review B 76.2(2007):024113.
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