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EFFECT OF MAGNETIC NANOPARTICLES ON THE MECHANICAL PROPERTIES OF TYPE-II SUPERCONDUCTORS

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Acta Mechanica Solida Sinica 2014年第1期27卷 65-72页

作者： Chenguang Huang Huadong Yong Youhe Zhou Key Laboratory of Mechanics on Environment and Disaster in Western China The Ministry of Education of China and Department of Mechanics and Engineering Sciences School of Civil Engineering and MechanicsLanzhou University

In this paper, the effect of magnetic nanoparticles on the mechanical properties of a type-II superconductor is investigated both theoretically and numerically. Magnetic part of the pinning force associated with the interaction between a finite-size spheroidal magnetic inclusion and an Abrikosov vortex is calculated in the London approximation. It is found that the size and shape of magnetic nanoparticles result in different enhancements of vortex pinning in large-k type-II superconductors. Meanwhile, the screening current induced by a magnetic spheroid suffer the action of Lorentz force, which will lead to prestress in the superconductor, so further numerical calculations are needed to explore the interaction between the spheroidal magnetic particle and superconductor. The distribution of displacement, stress and strain in the superconductor are finally obtained. It is shown that different sizes and shapes of nanoparticles also can change the distributions of these quantities.

关键词： magnetic nanoparticles spheroidal inclusion pinning force stress distribution type-II superconductor

A review of thickness-induced evolutions of microstructure and superconducting performance of REBa2Cu3O7-δ coated conductor

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Advances in Manufacturing 2017年第2期5卷 165-176页

作者： Jian-Xin Lin Xu-Ming Liu Chuan-Wei Cui Chuan-Yi Bai Yu-Ming Lu Feng Fan Yan-Qun Guo Zhi-Yong Liu Chuan-Bing Cai Shanghai Key Laboratory of High Temperature Superconductors Shanghai University Shanghai 200444People's Republic of China

The research and development of high temperature superconducting （HTS） films, especially ReBa2Cu3- O7-δ （REBCO or RE123; RE=Y, Gd, or other rare earths） yttrium-based coated conductors, has generated widespread interest for the potential applications of the second generation superconducting films. In view of commercialization, however, the maximum superconducting currents for coated conductors should be increased further. Unfortunately, it has been frequently observed that the average critical current density Jc decreases with an increase in film thickness. The thickness effect is still a hurdle for largescale production, especially in pulsed laser deposition and metal organic deposition processes. An engineering current of more than 1 000 A/cm is desired owing to the high cost of 2G superconducting materials. The present work attempts to review the evolution of various issues subject to the thickness effect, including the microstructure, epitaxial texture, surface roughness, pinning force, oxygen deficiency, residual stress, copper-rich layers, and segregation of elements. Furthermore, recent progress in enhancing the performance of superconductors especially in terms of critical current density is illustrated, such as the use of heavy doping. Further understanding of the thickness effect is extremely important for large-scale commercial development of the second generation high temperature superconductors.

关键词： Thickness effect Superconducting film Critical current density Microstructure Epitaxial texture pinning force

Unpinning the spiral waves by using parameter waves

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Chinese Physics B 2021年第5期30卷 682-686页

作者：彭璐唐军 School of Materials and Physics China University of Mining and TechnologyXuzhou 221116China

The spiral waves anchored to heterogeneous areas are more difficult to control and eliminate than freely rotating ones in homogenous *** eliminate pinned spiral waves,the resistant force should be provided to resist the pinning *** than advection field,we introduce parametric wave to play the role of providing resistant *** is found that the parametric wave with large enough amplitude and proper frequency can unpin and eliminate the spiral wave *** capability of parametric wave in providing resistant force is dependent on its amplitude and frequency *** the basis of parametric wave,the dependence of pinning force on the size and level of heterogeneity is further confirmed.

关键词： pinned spiral wave heterogeneity pinning force

Periodic synchronization in a system of coupled phase oscillators with attractive and repulsive interactions

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Frontiers of physics 2018年第3期13卷 163-169页

作者： Chong Xiao Jun-Long Tian Fang Lin Dong-Wei Ma Jing Zhang Hai-Tao Cui Yi Xiao School of Physics and Electrical Engineering Anyang Normal University Anyang 455000 China School of Physics Huazhong University of Science and Technology Wuhan 430074 China

In this study we investigate the collective behavior of the generalized Kuramoto model with an ex- ternal pinning force in which oscillators with positive and negative coupling strengths are conformists and contrarians, respectively. We focus on a situation in which the natural frequencies of the oscilla- tors follow a uniform probability density. By numerically simulating the model, it is shown that the model supports multistable synchronized states such as a traveling wave state, π state and periodic synchronous state： an oscillating π state. The oscillating π state may be characterized by the phase distribution oscillating in a confined region and the phase difference between conformists and contrar- ians oscillating around π periodically. In addition, we present the parameter space of the oscillating state and traveling wave state of the model.

关键词： generalized Kuramoto model pinning force conformists contrarians oscillating π state

CALCULATION OF SECOND PHASE PARTICLE-GRAIN BOUNDARY INTERACTION RANGE

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Acta Metallurgica Sinica(English Letters) 2008年第1期21卷 8-14页

作者： X.L. Wang Y.H. Wei W. Wang L.F. Hou College of Materials Science and Engineering Taiyuan University of Technology Taiyuan 030024 China Baosteel Technology Center Baoshan Iron ＆ Steel Co. Ltd. Shanghai 201900 China Manuscript received 20 December 2006

On the basis of the grain boundary equation by HeUman and corresponding analysis of Worner, this article deals with the interaction range between the second-phase particle （SPP） and grain boundary （GB） as viewed from the applicability of grain boundary equation. Also, a new expression describing the interaction range has been derived, which solves the problem in theory that the interaction range between SPP and GB can only be qualitatively analyzed previously. It is shown that given the interaction position between SPP and GB, the interaction range can be quantitatively determined by use of this expression.

关键词： Second-phase particle Grain boundary pinning force Surface free energy

Modeling Study of the Particle pinning Effect on the Grain Boundary Movement

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Journal of Iron and Steel Research(International) 2011年第S1期18卷 342-345页

作者： WANG Xue-lun 1,FU Li-ming 2,WANG Wei 3,JIA Zhi-xin 1 (1.Rizhaosteel Technology Center,Rizhao Iron and Steel Co Ltd.Rizhao 276806,China 2.School of Materials Science and Engineering,Shanghai Jiaotong University,Shanghai 200240 China 3 Department of Structural Steels,Baosteel Research Institute,Shanghai 201900,China) Rizhao Iron & Steel Co Ltd Rizhaosteel Technol Ctr Rizhao 276806 Peoples R China Shanghai Jiao Tong Univ Sch Mat Sci & Engn Shanghai 200240 Peoples R China Baosteel Res Inst Dept Struct Steels Shanghai 201900 Peoples R China

In this work,based on the classical grain boundary (GB) formula and the principle of work-energy conversion,a new physically-based model has been developed to predict the particle pinning force concerning the interaction between second phase particles (SPPs) and the moving *** effect of particles pinning on the GB movement is *** modeling results can be applied to quantitatively determine the critical numbers of SPPs required for complete pining the grain growth,such as the critical SPPs number of the unit GB area,the critical number for single grain stagnation,the critical volume fraction of particles at a given particle *** predictions are in good agreement with the experimental results by Gladman.

关键词： the second-phase particle pinning force physical-based model