Atomistic simulations of crack nucleation and intergranular fracture in bulk nanocrystalline nickel

doi:10.1103/PhysRevB.76.024113

IMECH-IR > 力学所知识产出(1956-2008)

	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.
发表期刊	Physical Review B
	2007
卷号	76 期号:2 页码:024113
ISSN	1098-0121
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.
关键词	Molecular-dynamics Simulation Polycrystalline Materials Plastic-deformation Tensile Ductility Metals Transition Behavior Copper
DOI	10.1103/PhysRevB.76.024113
收录类别	SCI
语种	英语
WOS记录号	WOS:000248496200033
关键词[WOS]	MOLECULAR-DYNAMICS SIMULATION ; POLYCRYSTALLINE MATERIALS ; PLASTIC-DEFORMATION ; TENSILE DUCTILITY ; METALS ; TRANSITION ; BEHAVIOR ; COPPER
WOS研究方向	Physics
WOS类目	Physics, Condensed Matter
引用统计	被引频次：78[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/311007/33933
专题	力学所知识产出(1956-2008)
通讯作者	Cao, AJ (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100080, Peoples R China.
推荐引用方式 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.
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.
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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