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High-throughput screening of critical size of grain growth in gradient structured nickel

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Journal of Materials Science & Technology 2021年第23期82卷 33-39页

作者： Yunli Lu Fenghui Duan Jie Pan Yi Li Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei230026China

Nanocrystalline metals with high Gibbs free energy have a strong tendency towards thermally driven grain growth,thus understanding the critical size or temperature of grain growth is vital for their *** investigations of thermal stability were usually conducted on the materials with a homogeneous structure;however,these methods are time-consuming and *** the present work,we reveal a high-throughput experimental strategy to characterize the size-dependent thermal stability via annealing the gradient structured *** this method,the critical size of grain growth(d_(c))at a given annealing temperature was rapidly *** critical size of grain growth was~95 nm when annealed at 503 K for 3 h,which is consistent with the value reported in the homogeneous structured ***,this critical size was found to be identical in three types of gradient structured Ni,i.e.,independent on the gradient *** present work demonstrates a high-throughput strategy for exploring the critical size of grain growth and size-dependent thermal stability of metals.

关键词： High-throughput Gradient structure critical size Grain growth Thermal stablitiy

EVALUATION OF MORPHOLOGY-STABLE critical size OF KNbO3 CRYSTALS

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空间科学学报 2002年第Z1期22卷 163-163页

作者： CAI Lixia JIN Weiqing PAN Zhilei LIANG Xinan Shinichi YODA Shanghai Institute of Ceramics The Chinese Academy of Sciences Shanghai 200050 P.R. China Shanghai Institute of Ceramics The Chinese Academy of Sciences Shanghai 200050 P.R. China Shanghai Institute of Ceramics The Chinese Academy of Sciences Shanghai 200050 P.R. China Shanghai Institute of Ceramics The Chinese Academy of Sciences Shanghai 200050 P.R. China National Space Development Agency of Japan Ibaraki 305 Japan

　　Skeletal form of KNbO3 crystals growing in Li2B4O7 solvent was in-situ observed at 900°C and it was found that shallow depression started to develop on the surface of KNbO3 crystals when the crystal size exceeded several micron, typically 7 *** on the quantitative criterion derived by Chernov, the estimated critical size of KNbO3 crystals was 1 micron, which was consistent with the experimental measure ment. The kinetic coefficients, kcorner and kcr, in the criterion were experimentally obtained in the diffusive-convective and diffusive-advective flow states respectively.……

关键词： critical size measure ment crystal size form of

Theoretical study on the stability of nanobubbles and its verification in molecular dynamics simulation

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Particuology 2024年第4期87卷 99-105页

作者： Sheng Mi Chaofeng Hou Wei Ge School of Chemical Engineering and Technology Tianjin UniversityTianjin300072China State Key Laboratory of Multiphase Complex Systems Institute of Process EngineeringChinese Academy of SciencesBeijing.100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing100049China

The stability of vapor nanobubbles in bulk liquid was investigated theoretically and the critical bubble size was derived from macroscale thermodynamic equations,below which the system destabilizes with sharp drop in *** critical size was quantitatively verified in molecular dynamic simulation using the Lennard-Jones model of argon,where stronger attraction between the molecules at lower density is found to contribute most to the drop of system pressure and,as the Laplace pressure on the curved bubble interface fails to balance the pressure difference across the interface,the bubbles become *** theoretical model could be extended to other systems where reliable equations of state and interfacial tension are available.

关键词： Nanobubble Stability Phase diagram critical size

Two-dimensional analysis of progressive delamination in thin film electrodes

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Acta Mechanica Sinica 2018年第2期34卷 359-370页

作者： Mei Liu Bo Lu Dong-Li Shi Jun-Qian Zhang Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Department of Mechanics Shanghai University Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai University Materials Genome Institute Shanghai University

By employing the two-dimensional analysis, i.e.,plane strain and plane stress, a semi-analytical method is developed to investigate the interfacial delamination in electrodes. The key parameters are obtained from the governing equations, and their effects on the evolution of the delamination are evaluated. The impact of constraint perpendicular to the plane is also investigated by comparing the plane strain and plane stress. It is found that the delamination in the plane strain condition occurs easier, indicating that the constraint is harmful to maintain the structure stability. According to the obtained governing equations, a formula of the dimensionless critical size for delamination is provided, which is a function of the maximum volumetric strain and the Poisson’s ratio of the active layer.

关键词： Lithium-ion battery Thin film electrode Delamination critical size

Electrospray Ionization Fourier Transform Ion Cyclotron Resonance Mass Spectrometric Study on Sodium Azide Cluster Ions

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Chinese Journal of Chemistry 2004年第10期22卷 1164-1169页

作者：刘晗青郭寅龙陆豪杰陈国强 Shanghai Mass Spectrometry Centre Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Department of Chemistry Fudan University Shanghai 200433 China

Sodium azide has rarely been studied in gas phase or in the form of cluster ions and as a model of solid ener-getic substances and inorganic azide salt was ionized by electrospray ionization (ESI) and studied by high resolution Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry (MS) systematically. This paper highlights the effects of experimental conditions on the formation of salt cluster and the collision activation dissociation path-ways of cluster ions to develop a microscopic understanding of inorganic azide salt clusters.

关键词： Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry (MS) electrospray ioniza-tion (ESI) cluster sodium azide collision activation dissociation (CAD) magic number critical size

Strain rate and size effect on dislocation plasticity in single crystalline pillar

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Strain rate and size effect on dislocation plasticity in sin...

α-氧化铝生成的临界、基础晶径及其超微粒粉末制作

2018年全国固体力学学术会议

作者： Jianqiao Hu Zhuo Zhuang Xiaoming Liu Zhanli Liu State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Applied Mechanics Lab. School of Aerospace Engineering Tsinghua University

Dislocation plays an important role in the plastic deformation of crystalline materials. The deformation mechanism varies with strain rate, sample size and internal defects. In this work, discrete dislocation dynamics(DDD) are performed to clarify the dislocation controlled plasticity in single crystalline copper pillars with diameter ranging from 100 to 800 nm. It is founded that there is a transition from dislocation multiplication to surface nucleation when strain rate increases or sample size decreases. Two analytical models are established based on the surface nucleation mechanism and the single arm source dominated plasticity, respectively. The critical resolved shear stress at different sizes evaluated by the analytical models matches well with the experiment results. The critical size when the dominated dislocation mechanism transforms is predicted to be ～140 nm.

关键词： Surface nucleation strain rate submicron pillars discrete dislocation dynamic critical size

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中国粉体技术 2000年第Z1期6卷 8-14页

作者：颜富士郑功杰温惠玲成功大学资源工程系台湾台南70101

以实验方法证明奈米级微粒氧化铝粉末在θ→α相变过程中存在临界晶径dc 及基础晶径dp。实验对两种不同晶径之θ -Al2 O3 粉末于设定温度热处理条件下制得观察样品 ,再藉热差分析 (DTA)、X -光绕射、及穿透式电子显微技术。

关键词： alumina critical size primary size