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) |
| 推荐引用方式 GB/T 7714 | 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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