Grain Boundary Effects On Plastic Deformation And Fracture Mechanisms In Cu Nanowires: Molecular Dynamics Simulations

doi:10.1103/PhysRevB.77.195429

IMECH-IR > 力学所知识产出(1956-2008)

	Grain Boundary Effects On Plastic Deformation And Fracture Mechanisms In Cu Nanowires: Molecular Dynamics Simulations
	Cao AJ(曹阿静); Wei YG(魏悦广); Ma E; Cao, A (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100080, Peoples R China.
发表期刊	Physical Review B
	2008
ISSN	1098-0121
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.
关键词	Gold Nanowires Atomistic Simulations Metal Nanowires Strength Copper Instability Nucleation Surface Stress
DOI	10.1103/PhysRevB.77.195429
收录类别	SCI
语种	英语
WOS记录号	WOS:000256971600137
关键词[WOS]	GOLD NANOWIRES ; ATOMISTIC SIMULATIONS ; METAL NANOWIRES ; STRENGTH ; COPPER ; INSTABILITY ; NUCLEATION ; SURFACE ; STRESS
WOS研究方向	Physics
WOS类目	Physics, Condensed Matter
引用统计	被引频次：94[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/25990
专题	力学所知识产出(1956-2008)
通讯作者	Cao, A (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100080, Peoples R China.
推荐引用方式 GB/T 7714	Cao AJ,Wei YG,Ma E,et al. 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,&Cao, A .(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).

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