Grain Boundary Effects On Plastic Deformation And Fracture Mechanisms In Cu Nanowires: Molecular Dynamics Simulations
文献类型：期刊论文
| 作者 | Cao AJ(曹阿静) ; Wei YG(魏悦广); Ma E
|
| 刊名 | Physical Review B
 |
| 出版日期 | 2008 |
| 通讯作者邮箱 | ajcao@jhu.edu |
| 关键词 | Gold Nanowires Atomistic Simulations Metal Nanowires Strength Copper Instability Nucleation Surface Stress |
| ISSN号 | 1098-0121 |
| 通讯作者 | Cao, A (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100080, Peoples R China. |
| 中文摘要 | Metallic nanowires have many attractive properties such as ultra-high yield strength and large tensile elongation. However, recent experiments show that metallic nanowires often contain grain boundaries, which are expected to significantly affect mechanical properties. By using molecular dynamics simulations, here, we demonstrate that polycrystalline Cu nanowires exhibit tensile deformation behavior distinctly different from their single-crystal counterparts. A significantly lowered yield strength was observed as a result of dislocation emission from grain boundaries rather than from free surfaces, despite of the very high surface to volume ratio. Necking starts from the grain boundary followed by fracture, resulting in reduced tensile ductility. The high stresses found in the grain boundary region clearly play a dominant role in controlling both inelastic deformation and fracture processes in nanoscale objects. These findings have implications for designing stronger and more ductile structures and devices on nanoscale. |
| 类目[WOS] | Physics, Condensed Matter |
| 研究领域[WOS] | Physics |
| 关键词[WOS] | GOLD NANOWIRES ; ATOMISTIC SIMULATIONS ; METAL NANOWIRES ; STRENGTH ; COPPER ; INSTABILITY ; NUCLEATION ; SURFACE ; STRESS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000256971600137 |
| 公开日期 | 2009-08-03 ; 2009-09-14 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/25990]  |
| 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,Ma E. Grain Boundary Effects On Plastic Deformation And Fracture Mechanisms In Cu Nanowires: Molecular Dynamics Simulations[J]. Physical Review B,2008. |
| APA | 曹阿静,魏悦广,&Ma E.(2008).Grain Boundary Effects On Plastic Deformation And Fracture Mechanisms In Cu Nanowires: Molecular Dynamics Simulations.Physical Review B. |
| MLA | 曹阿静,et al."Grain Boundary Effects On Plastic Deformation And Fracture Mechanisms In Cu Nanowires: Molecular Dynamics Simulations".Physical Review B (2008). |
入库方式： OAI收割
来源：力学研究所
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