Analytical model and molecular dynamics simulations of the size dependence of flow stress in amorphous intermetallic nanowires at temperatures near the glass transition

doi:10.1103/PhysRevB.81.125402

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	Analytical model and molecular dynamics simulations of the size dependence of flow stress in amorphous intermetallic nanowires at temperatures near the glass transition
	Wei YJ(魏宇杰); Bower AF; Gao HJ(高华健); Yujie Wei
发表期刊	Physical Review B
	2010
卷号	81 期号:125402 页码:1-13
ISSN	1098-0121
摘要	Molecular dynamics (MD) simulations are used to compute the flow stress of amorphous metallic nanowires that are deformed at temperatures near the glass transition. The simulations predict a strong size dependence of flow stress and predict the existence of a critical wire radius that minimizes the flow stress. Examination of the cross sections of the wires shows evidence of significant free-volume nucleation and diffusion during straining. The MD results are interpreted using a simple analytical model that assumes that the wire deforms by a combination of viscous flow, together with a diffusional deformation process in which free volume is continuously nucleated in the interior of the wire, and subsequently diffuses to the surface. The predictions of the model are in good qualitative agreement with simulation results. The analytical model is used to estimate the critical wire dimensions where this diffusional mechanism is likely to replace viscous creep at time scales that are inaccessible using MD simulations.
DOI	10.1103/PhysRevB.81.125402
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收录类别	SCI
语种	英语
WOS记录号	WOS:000276248900119
关键词[WOS]	BULK METALLIC-GLASS ; DEFORMATION ; LIQUID ; DIFFUSION ; LOCALIZATION ; PLASTICITY ; VISCOSITY ; STATES ; ALLOY ; RANGE
WOS研究方向	Physics
WOS类目	Physics, Condensed Matter
引用统计	被引频次：18[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/311007/48350
专题	非线性力学国家重点实验室
通讯作者	Yujie Wei
推荐引用方式 GB/T 7714	Wei YJ,Bower AF,Gao HJ,et al. Analytical model and molecular dynamics simulations of the size dependence of flow stress in amorphous intermetallic nanowires at temperatures near the glass transition[J]. Physical Review B,2010,81,125402,:1-13.
APA	Wei YJ,Bower AF,Gao HJ,&Yujie Wei.(2010).Analytical model and molecular dynamics simulations of the size dependence of flow stress in amorphous intermetallic nanowires at temperatures near the glass transition.Physical Review B,81(125402),1-13.
MLA	Wei YJ,et al."Analytical model and molecular dynamics simulations of the size dependence of flow stress in amorphous intermetallic nanowires at temperatures near the glass transition".Physical Review B 81.125402(2010):1-13.

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