中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Atomistic simulations of crack nucleation and intergranular fracture in bulk nanocrystalline nickel

文献类型:期刊论文

作者Cao AJ(曹阿静); Wei YG(魏悦广)
刊名Physical Review B
出版日期2007
卷号76期号:2页码:024113
关键词Molecular-Dynamics Simulation Polycrystalline Materials Plastic-Deformation Tensile Ductility Metals Transition Behavior Copper
ISSN号1098-0121
通讯作者Cao, AJ (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100080, Peoples R China.
中文摘要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.
类目[WOS]Physics, Condensed Matter
研究领域[WOS]Physics
关键词[WOS]MOLECULAR-DYNAMICS SIMULATION ; POLYCRYSTALLINE MATERIALS ; PLASTIC-DEFORMATION ; TENSILE DUCTILITY ; METALS ; TRANSITION ; BEHAVIOR ; COPPER
收录类别SCI
语种英语
WOS记录号WOS:000248496200033
公开日期2009-08-03 ; 2010-06-13
源URL[http://dspace.imech.ac.cn/handle/311007/33933]  
专题力学研究所_力学所知识产出(1956-2008)
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Cao AJ,Wei YG. Atomistic simulations of crack nucleation and intergranular fracture in bulk nanocrystalline nickel[J]. Physical Review B,2007,76(2):024113.
APA 曹阿静,&魏悦广.(2007).Atomistic simulations of crack nucleation and intergranular fracture in bulk nanocrystalline nickel.Physical Review B,76(2),024113.
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.

入库方式: OAI收割

来源:力学研究所

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