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strain gradient induced grain refinement far below the size limit in a low carbon hypoeutectoid steel(0.19 wt%C)via pipe inner surface grinding treatment

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Journal of Materials Science & Technology 2021年第19期78卷 155-169页

作者： Wenqiang Li Yiming Zhao Ning Liu Changji Li Ruiming Ren Dayong Cai Hongwang Zhang National Engineering Research Center for Equipment and Technology of Cold Strip Rolling College of Mechanical EngineeringYanshan UniversityQinhuangdao 066004China National Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Liren College of Yanshan University Yanshan UniversityQinhuangdao 066004China School of Materials Science&Engineering Dalian Jiaotong UniversityDalian 116028China Qinhuangdao Vocational and Technical College Qinhuangdao 066100China

A low carbon hypoeutectoid steel(0.19 wt%C)with proeutectoid ferrite and pearlite dual-components was subjected to surface plastic deformation via pipe inner surface grinding(PISG)at room *** deformation microstructures for each component were systematically characterized along depth,and the patterns of structural evolution toward nanometer regime as well as the governing parameters were *** ferrite grains were refined down to 17 nm,and the pattern covering a length scale of 4–5 orders of magnitude from micron-to nanometer-scale follows:formation of cellular dislocation structure(CDS),elongated dislocation structure(EDS),ultrafine lamellar structure(UFL)and finally the nanolaminated structure(NL).The pearlite experiences the deformation and refinement,and finally the transforming the ultrafine pearlite(UFP)into nanolaminated pearlite(NLP)with the ferrite lamellae as thin as 20 *** for both UFL(UFP)and NL(NLP)can be realized via forming novel extended boundaries within ferrite lamellae.A critical lattice curvature of~2.8°is required for forming such extended boundary,corresponding to a minimum strain gradient of 0.25μm^(-1)for a 100 nm-thick *** below size limit(expressed by lamellar thickness d_Tin nm)is correlated with the strain gradient(χ,inμm^(-1))by:d_T=12.5/*** contributions from strain gradient caused by PISG processing and material heterogeneity were discussed.

关键词： strain gradient Grain refinement Size limit Low carbon hypoeutectoid steel Pipe inner surface grinding

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Magnetic Interactions with strain gradient in Ultrathin Pr_(0.67)Sr_(0.33)MnO_(3) Films

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Engineering 2024年第9期40卷 158-165页

作者： Bangmin Zhang Ping Yang Jun Ding Jingsheng Chen Gan Moog Chow Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices School of PhysicsSun Yat-sen UniversityGuangzhou 510275China Singapore Synchrotron Light Source National University of SingaporeSingapore 117603Singapore Department of Materials Science and Engineering National University of SingaporeSingapore 117575Singapore

strain gradient is a normal phenomenon around a heterostructural interface in ultrathin film,and it is important to determine its effect on magnetic interactions to understand interfacial *** this work,ultrathin Pr_(0.67)Sr_(0.33)MnO_(3)(PSMO)films on different substrates are *** PSMO film under different in-plane strain conditions,the saturated magnetization and Curie temperature can be qualitatively explained by double-exchange interaction and the Jahn-Teller ***,the difference in the saturated magnetization with zero field cooling and 5 T field cooling is proportional to the strain ***-gradient-induced structural disorder is proposed to enhance phonon-electron antiferromagnetic interactions and the corresponding antiferromagnetic-to-ferromagnetic phase transition via a strong magnetic field during the field cooling process.A non-monotonous structural transition of the MnO_(6) octahedral rotation can enlarge the strain gradient in PSMO film on a SrTiO_(3) *** work demonstrates the existence of the flexomagnetic effect in ultrathin manganite film,which should be applicable to other complex oxide systems.

关键词： strain gradient Manganite film Octahedral rotation Flexomagnetic Magnetic interactions Phase transition

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Skyrmion transport driven by pure voltage generated strain gradient

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Chinese Physics B 2022年第11期31卷 566-570页

作者： Shan Qiu Jia-Hao Liu Ya-Bo Chen Yun-Ping Zhao Bo Wei Liang Fang Institute for Quantum Information&State Key Laboratory of High Performance Computing College of ComputerNational University of Defense TechnologyChangsha 410073China Hunan University of Humanities Science and Technology Loudi 417000China

The magnetic skyrmion transport driven by pure voltage-induced strain gradient is proposed and studied via micromagnetic *** combining the skyrmion with multiferroic heterojunction,a voltage-induced uniaxial strain gradient is adjusted to move *** the system,a pair of short-circuited trapezoidal top electrodes can generate the symmetric *** to the symmetry of strain,the magnetic skyrmion can be driven with a linear motion in the middle of the nanostrip without *** calculate the strain distribution generated by the trapezoidal top electrodes pair,and further investigate the influence of the strain intensity as well as the strain gradient on the skyrmion *** findings provide a stable and low-energy regulation method for skyrmion transport.

关键词： skyrmion strain gradient multiferroic heterojunction spintronics

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Atomic-scale simulations for lithium dendrite growth driven by strain gradient

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Applied Mathematics and Mechanics(English Edition) 2020年第4期41卷 533-542页

作者： Gao XU Feng HAO Jiawang HONG Daining FANG State Key Laboratory for Turbulence and Complex Systems&Center for Applied Physics and Technology College of EngineeringPeking UniversityBeijing 100871China Department of Engineering Mechanics Shandong UniversityJinan 250100China School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China

Dendrite formation is a major obstacle, e.g., capacity loss and short circuit,to the next-generation high-energy-density lithium(Li)-metal batteries. The development of successful Li dendrite mitigation strategies is impeded by an insu?cient understanding in Li dendrite growth mechanisms. The Li-plating-induced internal stress in Li-metal and its e?ects on dendrite growth have been widely studied, but the underlying microcosmic mechanism is elusive. In the present study, the role of the plating-induced stress in dendrite formation is analyzed through ?rst-principles calculations and ab initio molecular dynamic(AIMD) simulations. It is shown that the deposited Li forms a stable atomic nano?lm structure on the copper(Cu) substrate, and the adsorption energy of Li atoms increases from the Li-Cu interface to the deposited Li surface, leading to more aggregated Li atoms at the interface. Compared with the pristine Li-metal, the deposited Li in the early stage becomes compacted and su?ers the in-plane compressive stress. Interestingly,there is a giant strain gradient distribution from the Li-Cu interface to the deposited Li surface, making the deposited atoms adjacent to the Cu surface tend to press upwards with perturbation and causing the dendrite growth. This provides an insight into the atomicscale origin of Li dendrite growth, and may be useful for suppressing the Li dendrite in Li-metal-based rechargeable batteries.

关键词： lithium(Li)-metal-based battery Li dendrite strain gradient depositing

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Unexpected Kirkendall effect in twinned icosahedral nanocrystals driven by strain gradient

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Nano Research 2020年第10期13卷 2641-2649页

作者： Jingbo Huang Yucong Yan Xiao Li Xurong Qiao Xingqiao Wu Junjie Li Rong Shen Deren Yang Hui Zhang State Key Laboratory of Silicon Materials School of Materials Science&EngineeringCyrus Tang Center for Sensor Materials and ApplicationsZhejiang UniversityHangzhou 310027China Advanced Technology Department SAIC Motor Corporation LimitedShanghai 201804China State Key Laboratory of Heary Oil Proessing School of Materials Science and EngineeringChina University of PetroleumQingdao 266580China

Nanoscale Kirkendall effect has been widely used for rationally fabricating high-quality hollow nanocrystals, but often requires the intrinsic diffusion coefficient of out-diffusion materials higher than that of in-diffusion components. Here we demonstrate an unexpected Kirkendall effect that occurs in diffusing intrinsically faster Cu atoms into Pd icosahedra, leading to the formation of PdCu alloyed hollow nanocrystals. The control experiment with Pd octahedra replacing icosahedra indicates the critical role of twin boundaries in facilitating such unexpected Kirkendall effect. In addition, geometric phase analysis and density functional theory calculation show that out-diffusion of Pd atoms in the icosahedra is faster than in-diffusion of Cu atoms, particularly through the twin boundaries, upon the strain gradient with an inward distribution from tensile to compressive strains. The unexpected Kirkendall effect is also found in the interdiffusion of Ag and Pd atoms in Pd icosahedra. Our finds break the limitation of the intrinsic diffusion coefficient for the synthesis of hollow nanocrystals through Kirkendall effect and are expected to enormously enrich the family of hollow nanocrystals which have shown great potential in broad areas, such as fine chemical production, energy storage and conversion, and environmental protection. This work also provides a deep understanding in the diffusion behavior of atoms upon the strain gradient.

关键词： Kirkendall effect diffusion coefficient interdiffusion chemical potential icosahedral nanocrystals strain gradient

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CRACK TIP FIELD AND J-INTEGRAL WITH strain gradient EFFECT

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Acta Mechanica Sinica 2004年第3期20卷 228-237页

作者：夏嵩王自强陈少华 LNM Institute of MechanicsChinese Academy of SciencesBeijing 100080China

The mode I plane strain crack tip field with strain gradient effects is presented in this paper based on a simplified strain gradient theory within the framework proposed by Acharya and *** theory retains the essential structure of the incremental version of the conventional J_2 deformation *** higher-order stress is introduced and no extra boundary value conditions beyond the conventional ones are *** strain gradient effects are considered in the constitutive relation only through the instantaneous tangent *** strain gradient measures are included into the tangent modulus as internal *** the boundary value problem is the same as that in the conventional *** typical crack problems are studied:(a)the crack tip field under the small scale yielding condition induced by a linear elastic mode-I K-field and(b)the complete field for a compact tension *** calculated results clearly show that the stress level near the crack tip with strain gradient effects is considerable higher than that in the classical *** singularity of the strain field near the crack tip is nearly equal to the square-root singularity and the singularity of the stress field is slightly greater than ***,the J-integral is no longer path independent and increases monotonically as the radius of the calculated circular contour decreases.

关键词： strain gradient FEM crack tip field J-integral

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Limit analysis of viscoplastic thick-walled cylinder and spherical shell under internal pressure using a strain gradient plasticity theory

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Applied Mathematics and Mechanics(English Edition) 2008年第12期29卷 1553-1559页

作者：李茂林扶名福 School of Mechanical and Electrical Engineering Nanchang University College of Civil Engineering and Architecture Nanchang University of Aeronautics

Plastic limit load of viscoplastic thick-walled cylinder and spherical shell subjected to internal pressure is investigated analytically using a strain gradient plasticity theory. As a result, the current solutions can capture the size effect at the micron scale. Numerical results show that the smaller the inner radius of the cylinder or spherical shell, the more significant the scale effects. Results also show that the size effect is more evident with increasing strain or strain-rate sensitivity index. The classical plastic-based solutions of the same problems are shown to be a special case of the present solution.

关键词： thick-walled cylinder and spherical shell strain gradient nonlocal viscoplasticity

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THE BOUNDARY LAYER SOLUTIONS OF THE INTERFACE PROBLEM CONSIDERING THE strain gradient

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Acta Mechanica Solida Sinica 1999年第3期12卷 206-210页

作者： Wang Gangfeng Yu Shouwen Tsing Hua Univ Dept Engn Mech Beijing 100084 Peoples R China

Acoording to the classical elastic theory, there is always adiscontinuity of rotation angle on the interface different *** illogic result can be overcome by the strain gradient plasticitytheory. In the light of this theory, there is a group of boundarylayer solutions near the in- terface, which have made importantadjustment of the classical results.

关键词： strain gradient interface boundary layer

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Possibilities of the practical use of a stationary strain gradient in the interelectrode volume of unpolarized ferroceramic plates

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Journal of Advanced Dielectrics 2020年第1期10卷 61-67页

作者： Yu.N.Zakharov V.P.Sakhnenko I.A.Parinov I.P.Raevsky M.A.Bunin V.A.Chebanenko M.A.Zaerko E.I.Sitalo A.A.Pavelko L.I.Kiseleva Research Institute of Physics and Physics Faculty Southern Federal University Rostov-on-Don 344090 Russia Institute of Mathematics Mechanics and Computer Sciences Southern Federal UniversityRostov-on-Don 344090Russia Federal Research Centre The Southern Scientific Centre of the Russian Academy of The Sciences Rostov-on-Don 344004 Russia

It has been established that in plates made of hot-pressed ferroelectric ceramics PZT-19(Tc=300℃),after metal electrodes from Ag are burned into opposite surfaces with different depths of mechanical damage,counter-directional stationary deformation gradients and,accordingly,internal electric displacement fields create a stationary flexoelectric *** a result,unpolarized ceramics below the Curie temperature become a pyroelectric,and above it become a pyroelectric *** polishing the less damaged surface and replacing the Ag(valency v=3)electrode with Cr(v=6)by thermal evaporation in vacuum from the intact surface,a new thermally stable polarization is created,directed from the damaged surface in the interelectrode *** plates have an asymmetric dielectric hysteresis loop,retain the values of the pyroelectric effect and piezoelectric effect in the ferroelectric phase,as well as the bolometric effect in the paraelectric phase after repeated heating cycles to 400℃ and cooling to T_(norm).

关键词： strain gradient unpolarized ferroceramic pyroelectric effect bolometer

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应变梯度引起的极化畴结构减少铁电材料脆性

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Acta Mechanica Sinica 2023年第5期39卷 13-18页

作者：陈玉峻王鸿宇楼旭辉郭浩李晓雁王清远范海冬田晓宝 MOE Key Laboratory of Deep Earth Science and Engineering College of Architecture and EnvironmentSichuan UniversityChengdu610065China Department of Mechanics Sichuan UniversityChengdu610065China School of Urban Construction Material Simulation and Computing LaboratoryHebei Normal University of Science&TechnologyQinhuangdao066004China Center for Advanced Mechanics and Materials Applied Mechanics LaboratoryDepartment of Engineering MechanicsTsinghua UniversityBeijing100084China

铁电材料的力电耦合特性以及在纳米尺度的快速失效导致其剪切过程很难研究,而材料的脆性也限制了这些材料在铁电器件中的潜在应用.在这项工作中,我们使用分子动力学方法模拟了剪切和畴演变的动态过程,揭示了这些畴结构如何影响材料的力... 详细信息

铁电材料的力电耦合特性以及在纳米尺度的快速失效导致其剪切过程很难研究,而材料的脆性也限制了这些材料在铁电器件中的潜在应用.在这项工作中,我们使用分子动力学方法模拟了剪切和畴演变的动态过程,揭示了这些畴结构如何影响材料的力电性能.在原子尺度上,一个明显的极化旋涡状的畴结构出现在剪切带的尖端,两侧分别有180°和90°的畴壁.由应变梯度引起的挠曲电效应导致了这些复杂的畴结构.施加外部电场阻碍畴的翻转,并通过减少积累的能量减少了失配应变区域,加速了剪切过程.结果表明极化旋涡畴阻碍了剪切破坏过程,这启示我们可以通过设计畴结构来增韧铁电材料.

关键词： Ferroelectric toughening Molecular dynamics Vortex domain structure strain gradient

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