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diffusion-induced stress in inhomogeneous materials:concentration-dependent elastic modulus

Science China(Physics,Mechanics & Astronomy) 2012年第6期55卷 955-962页

作者： YANG FuQian Materials Program Department of Chemical and Materials Engineering University of Kentucky Lexington KY 40506 USA

By incorporating the contribution of solute atoms to the Helmholtz free energy of solid solution,a linear relation is derived between Young's modulus and the concentration of solute *** solute atoms can either increase or decrease Young's modulus of solid solution,depending on the first-order derivative of the Helmholtz free energy with respect to the concentration of solute *** this relation,a closed-form solution of the chemical stress in an elastic plate is obtained when the diffusion behavior in the plate can be described by the classical Fick's second law with convection boundary condition on one surface and zero flux on the other *** plate experiences tensile stress after short diffusion time due to asymmetrical diffusion,which will likely cause surface *** results show that the effect of the concentration dependence of Young's modulus on the evolution of chemical stress in elastic plates is negligible if the change of Young's modulus due to the diffusive motion of solute atomsis is not compatible in magnitude with Young's modulus of the pure ***,a new diffusion equation is developed for strictly regular binary solid *** effective diffusivity is a nonlinear function of the concentration of solute atoms.

关键词： diffusion-induced stresses concentration-dependent elastic modulus

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Surface and chemical diffusion effects of nanowire electrodes in lithium-ion batteries

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Science China(Technological Sciences) 2020年第11期63卷 2413-2422页

作者： JIA Ning PENG ZhiLong WANG Shuai LI JianJun YAO Yin CHEN ShaoHua Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China Beijing Key Laboratory of Lightweight Multi-Functional Composite Materials and Structures Beijing Institute of TechnologyBeijing 100081China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China College of Mechanical and Electrical Engineering Central South UniversityChangsha 410083China

Nanostructured electrodes with surface effect show a distinct advantage in prolonging the lifetime of lithium-ion(Li-ion)*** order to characterize the surface and chemical diffusion effects in a cylindrical nanowire electrode,a new theoretical model is proposed based on a combination of the diffusion theory and a surface energy density-based elastic *** the reformulation of the stress boundary condition in terms of a surface-induced traction,the bulk surface energy density and surface relaxation parameter are introduced as two simple parameters characterizing the surface effect in nanowire electrodes,instead of the surface elastic constants always used in existing ***-form solutions of the diffusion-induced elastic fields under potentiostatic operation are *** is found that the radial expansion and tensile stress in nanowire electrodes become smaller than the classical predictions without surface effect and decrease monotonically with a decreasing nanowire radius when the surface effect is *** phenomena can be basically attributed to the action of surface-induced traction on the nanowire *** results demonstrate the convenience and effectiveness of the present model in predicting the chemo-mechanical behavior of nanowire electrodes,which should be of guidance value for the optimal design of durable electrodes.

关键词： lithium-ion battery nanowire electrode diffusion-induced stresses surface effect surface energy density

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Microscopic phase-field study for oriented diffusion channel effect of nickel-based alloy and phases' effect mechanism

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Science China(Technological Sciences) 2011年第4期54卷 835-840页

作者： YANG Kun CHEN Zheng DONG WeiPing WANG YongXin ZHANG MingYi State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi'an 710072China

In this paper,a microscopic phase-field model was used to investigate the effect of the oriented diffusion channel and the phases' effect mechanism for the Ni75Al6.0V19.0 alloy during a phase transformation process.A diffusion channel of V was formed in the [100] *** oriented growth of DO22 in this direction,when an elastic misfit stress field existed,forced Al to form a diffusion channel next to DO22,resulting in L12-oriented *** an increase in stress,the oriented growth increased initially and then *** a higher stress,the average values of the occupation probability for V atoms became constant later while Al atoms earlier.

关键词： diffusion channel effect stresses-induced diffusion diffusion-induced stresses microscopic phase-field

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