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Multi-scale synergic optimization strategy for dielectric energy storage ceramics

Journal of Advanced Ceramics 2023年第4期12卷 649-680页

作者： Xuhui Fan Jing Wang Hao Yua Zehan Zheng Ji Zhang Kongjun Zhu State Key Laboratory of Mechanics and Control of Mechanical Structures College of Aerospace EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016China School of Materials Science and Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China

Dielectric capacitors,serving as the indispensable components in advanced high-power energy storage devices,have attracted ever-increasing attention with the rapid development of science and *** various dielectric capacitors,ceramic capacitors with perovskite structures show unique advantages in actual application,e.g.,excellent adaptability in high-temperature *** the optimization of their energy storage performance has become a hot research topic *** review presents the basic principles of energy storage in dielectric ceramics and introduces multi-scale synergic optimization strategies according to the key factors for superior energy storage *** summarizing the common points in numerous works,several universal modification strategies are reviewed,and future research on fatigue fracture of ceramic capacitors under multi-field including but not limited to force,electric,and thermal coupling conditions is also anticipated.

关键词： dielectric capacitors high-power energy storage multi-scale

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Corrosion behavior of single-and poly-crystalline dual-phase TiAl–Ti3Al alloy in NaCl solution

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International Journal of Minerals,Metallurgy and materials 2023年第4期30卷 689-696页

作者： Dongpeng Wang Guang Chen Anding Wang Yuxin Wang Yanxin Qiao Zhenguang Liu Zhixiang Qi Chain Tsuan Liu School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China Centre for Advanced Structural Materials Department of Mechanical and Biomechanical EngineeringCity University of Hong KongHong Kong 999077China Engineering Research Center of Materials Behavior and Design Ministry of EducationNanjing University of Science and TechnologyNanjing 210094China School of Materials Science and Engineering Dongguan University of TechnologyDongguan 523808China

To clarify the correlation of single-crystalline structure with corrosion performance in high-strength TiAl alloys, electrochemical and surface characterization was performed by comparing Ti–45Al–8Nb dual-phase single crystals with their polycrystalline counterparts in NaCl solution. Polarization curves show a lower corrosion rate and a higher pitting potential of ~280 mV for the dual-phase single crystals. Electrochemical impedance spectroscopy and potentiostatic polarization plots revealed a higher impedance of the charge transfer through the compact passive film. Surface composition analysis indicated a compact film with more content of Nb, as twice as that in the film on the *** results reflect that the dual-phase Ti–45Al–8Nb single crystals possess a higher corrosion resistance in NaCl solution, compared with their polycrystalline counterpart, arising from a more homogeneous microstructure and composition distribution.

关键词： titanium alloy single crystal corrosion X-ray photoelectron spectroscopy

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Imaging and structure analysis of ferroelectric domains,domain walls,and vortices by scanning electron diffraction

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npj Computational materials 2024年第1期10卷 2154-2161页

作者： Ursula Ludacka Jiali He Shuyu Qin Manuel Zahn Emil Frang Christiansen Kasper A.Hunnestad Xinqiao Zhang Zewu Yan Edith Bourret István Kézsmárki Antonius T.Jvan Helvoort Joshua Agar Dennis Meier Department of Materials Science and Engineering NTNU Norwegian University of Science and TechnologyTrondheimNorway Department of Computer Science and Engineering Lehigh UniversityBethlehemPAUSA Department of Mechanical Engineering and Mechanics Drexel UniversityPhiladelphiaPAUSA Experimental Physics V University of AugsburgAugsburgGermany Department of Physics NTNU Norwegian University of Science and TechnologyTrondheimNorway Department of Physics ETH ZurichZürichSwitzerland Materials Sciences Division Lawrence Berkeley National LaboratoryBerkeleyCAUSA

Direct electron detectors in scanning transmission electron microscopy give unprecedented possibilities for structure analysis at the *** electronic and quantum materials,this new capability gives access to,for example,emergent chiral structures and symmetry-breaking distortions that underpin functional *** nanoscale structural features with statistical significance,however,is complicated by the subtleties of dynamic diffraction and coexisting contrast mechanisms,which often results in a low signal-to-noise ratio and the superposition of multiple signals that are challenging to deconvolute.

关键词： properties structure ferroelectric

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Nickel-based superalloy architectures with surface mechanical attrition treatment: Compressive properties and collapse behaviour

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Nano materials science 2024年第5期6卷 587-595页

作者： Lizi Cheng Xiaofeng Zhang Jiacheng Xu Temitope Olumide Olugbade Gan Li Dongdong Dong Fucong Lyu Haojie Kong Mengke Huo Jian Lu CityU-Shenzhen Futian Research Institute ShenzhenChina Department of Mechanical Engineering City University of Hong KongHong KongChina Department of Engineering University of CambridgeCambridgeUK National Engineering Laboratory for Modern Materials Surface Engineering Technology&The Key Lab of Guangdong for Modern Surface Engineering Technology Institute of New MaterialsGuangdong Academy of Science510650GuangzhouChina Mechanical and Electronic Engineering Department School of Science and EngineeringUniversity of DundeeDundeeUK Centre for Advanced Structural Materials City University of Hong Kong Shenzhen Research InstituteGreater Bay Joint DivisionShenyang National Laboratory for Materials ScienceShenzhenChina

Surface modifications can introduce natural gradients or structural hierarchy into human-made microlattices,making them simultaneously strong and ***,we describe our investigations of the mechanical properties and the underlying mechanisms of additively manufactured nickel–chromium superalloy(IN625)microlattices after surface mechanical attrition treatment(SMAT).Our results demonstrated that SMAT increased the yielding strength of these microlattices by more than 64.71%and also triggered a transition in their mechanical *** primary failure modes were distinguished:weak global deformation,and layer-by-layer collapse,with the latter enhanced by *** significantly improved mechanical performance was attributable to the ultrafine and hard graded-nanograin layer induced by SMAT,which effectively leveraged the material and structural *** results were further validated by finite element *** work provides insight into collapse behaviour and should facilitate the design of ultralight yet buckling-resistant cellular materials.

关键词： Architected materials Selective laser melting Surface mechanical attrition treatment Structural analysis Ductile alloy

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Enhancing corrosion resistance of MAO coatings on Al alloy LY12 through in situ co-doping with zinc phosphate and cerium phosphate

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Corrosion Communications 2025年第1期17卷 35-43页

作者： Chao Yang Tao Ying Aihui Huang Jian Huang Pinghu Chen Paul K.Chu Xiaoqin Zeng National Engineering Research Center of Light Alloy Net Forming School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming School of Materials Science and Engineering Shanghai Jiao Tong University Department of Chemistry University of Munich(LMU) College of Mechanical Engineering Key Laboratory of Hunan Province of Equipment Safety Service Technology under Extreme Environment University of South China Department of Physics Department of Materials Science&Engineering and Department of Biomedical Engineering City University of Hong Kong

Corrosion of aluminum（Al） alloys during service limits many applications. Micro-arc oxidation（MAO） coatings can enhance corrosion resistance, but porous defects in the films undermine their effectiveness. Here, by mixing a phosphate electrolyte with soluble Zn and Ce salts, zinc phosphate and cerium phosphate co-doped MAO corrosion-resistant coating is prepared on Al alloy LY12. Zinc phosphate and cerium phosphate are incorporated in situ to form an amorphous encapsulated nanocrystalline structure. During long-term corrosion, Zn2+is released and deposited as corrosion products Zn（OH）2to cover weak corrosion micro-regions in the coating. Simultaneously, Ce3+released from MAO coating co-doped with zinc phosphate/cerium phosphate forms Zn（OH）2/Ce（OH）3due to the small solubility product Kspto further enhance corrosion resistance. Compared to pristine Al alloy,corrosion potential increases from -1.306 to -0.819 VSCE, and corrosion current density decreases by 4 orders of magnitude from 2.6 × 10-6to 2.5 × 10-10A·cm-2. Co-doped MAO coating significantly enhances corrosion resistance of Al alloy LY12 and shows great potential for a wide range of applications.

关键词： Aluminum alloys Micro-arc oxidation coating Corrosion resistance Zinc phosphate Cerium phosphate

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The vital application of rare earth for future high-performance electromagnetic wave absorption materials:A review

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Journal of materials science & Technology 2024年第9期176卷 188-203页

作者： Jing Qiao Lutong Li Jiurong Liu Na Wu Wei Liu Fan Wu Zhihui Zeng Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061China School of Mechanical Engineering Shandong UniversityJinan 250061China Department of Chemistry and Applied Biosciences ETH ZurichCH-8093 ZurichSwitzerland State Key Laboratory of Crystal Materials Shandong UniversityJinan 250061China School of Mechanical Engineering Nanjing University of Science&TechnologyNanjing 210094China

Rare earth(RE)takes an irreplaceable role in various fields,especially the high-tech electronics industry,which is usually comparable to the vitamin of *** the development of electromagnetic wave(EMW)absorption materials,the participation of RE makes a significant contribution as well,and great progress has been *** researches have illuminated that the strategy of both doping RE elements and constructing RE oxide composites exhibited huge potential for the fabrication of high-efficiency EMW absorption *** believe a systematic summary will be highly desired for a comprehensive understanding and future *** this review,we first summarized the research background,basic principles,and mechanisms of EMW ***,we classify the RE EMW absorption materials into RE-doped ferrites,RE-transition metal intermetallics,RE oxides,and other categories,view their current progress by typical studies,and expound their respective features,strengths,weaknesses,and absorption ***,the current challenges and future outlook of RE EMW absorption materials are highlighted,in the hope of guidance for a sound future development.

关键词： Rare earth Electromagnetic wave absorption Composite Rare earth oxide

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Simultaneous enhancement of strength and ductility via microband formation and nanotwinning in an L1_(2)-strengthened alloy

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Fundamental Research 2024年第1期4卷 147-157页

作者： Lu Yang Dingshan Liang Zhuo Cheng Ranxi Duan Chuanxin Zhong Junhua Luan Zengbao Jiao Fuzeng Ren Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China

Metallic alloys with high strength and large ductility are required for extreme structural ***,the achievement of ultrahigh strength often results in a substantially decreased ***,we report a strategy to achieve the strength-ductility synergy by tailoring the alloy composition to control the local stacking fault energy(SFE)of the face-centered-cubic(fcc)matrix in an L1_(2)-strengthened superlattice *** a proof of concept,based on the thermodynamic calculations,we developed a non-equiatomic CoCrNi_(2)(Al_(0.2)Nb_(0.2))alloy using phase separation to create a near-equiatomic low SFE disordered CoCrNi medium-entropy alloy matrix with in situ formed high-content coherent Ni_(3)(Al,Nb)-type ordered nanoprecipitates(∼12 nm).The alloy achieves a high tensile strength up to 1.6 GPa and a uniform ductility of 33%.The low SFE of the fcc matrix promotes the formation of nanotwins and parallel microbands during plastic deformation which could remarkably enhance the strain hardening *** work provides a strategy for developing ultrahigh-strength alloys with large uniform ductility.

关键词： L1_(2)-strengthened superlattice alloy Stacking fault energy Nanotwins Microbands Strain hardening

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Bio-Inspired Ionic Sensors: Transforming Natural Mechanisms into Sensory Technologies

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Nano-Micro Letters 2025年第8期17卷 67-94页

作者： Kyongtae Choi Gibeom Lee Min-Gyu Lee Hee Jae Hwang Kibeom Lee Younghoon Lee Department of Mechanical Engineering Kyung Hee University1732 Deogyeong-daeroGiheung-guYonginGyeonggi-do 17104Republic of Korea Department of Mechanical Engineering Gachon University1342 Seongnam-daeroSujeong-guSeongnamGyeonggi-do 13120Republic of Korea Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea Department of Mechanical Design Engineering Kumoh National Institute of Technology61 Daehak-roGumiGyeongsangbuk-do 39177Republic of Korea

Many natural organisms have evolved unique sensory systems over millions of years that have allowed them to detect various changes in their surrounding *** systems feature numerous receptors—such as photoreceptors,mechanoreceptors,and chemoreceptors—that detect various types of external stimuli,including light,pressure,vibration,sound,and chemical *** stimuli are converted into electrochemical signals,which are transmitted to the brain to produce the sensations of sight,touch,hearing,taste,and *** by the biological principles of sensory systems,recent advancements in electronics have led to a wide range of applications in artificial *** the current review,we highlight recent developments in artificial sensors inspired by biological sensory systems utilizing soft ionic *** versatile characteristics of these ionic materials are introduced while focusing on their mechanical and electrical *** features and working principles of natural and artificial sensing systems are investigated in terms of six categories:vision,tactile,hearing,gustatory,olfactory,and proximity ***,we explore several challenges that must be overcome while outlining future research directions in the field of soft ionic sensors.

关键词： Sensors Iontronics Soft materials Biomimetics

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Enhancing Corrosion Resistance and Antibacterial Properties of ZK60 Magnesium Alloy Using Micro-Arc Oxidation Coating Containing Nano-Zinc Oxide

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Acta Metallurgica Sinica(English Letters) 2025年第1期38卷 45-58页

作者： Jin-Xiu Li Jun-Xiu Chen M.A.Siddiqui S.K.Kolawole Yang Yang Ying Shen Jian-Ping Yang Jian-Hua Wang Xu-Ping Su Key Laboratory of Materials Surface Science and Technology of Jiangsu Province Higher Education Institutes Changzhou UniversityChangzhou213164China Department of Orthopedics and Traumatology The Chinese University of Hong KongHong Kong999077China School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing210094China Metallurgical Engineering Department NED University of Engineering and TechnologyUniversity RoadKarachiPakistan Mechanical Engineering Department School of Engineering and TechnologyFederal PolytechnicOffa P.M.B 420OffaNigeria Department of Orthopedics Changzhou Hospital of Traditional Chinese MedicineChangzhou213004China

Nano-zinc oxides(ZnO)demonstrate remarkable antibacterial *** further enhance the corrosion resistance and antibacterial efficiency of magnesium alloy micro-arc oxidation(MAO)coatings,this study investigates the preparation of ZnO-containing micro-arc oxidation coatings with dual functionality by incorporating nano-ZnO into MAO *** influence of varying ZnO concentrations on the microstructure,corrosion resistance,and antibacterial properties of the coating was examined through microstructure analysis,immersion tests,electrochemical experiments,and antibacterial *** findings revealed that the addition of nano-ZnO significantly enhanced the corrosion resistance of the MAO-coated ***,when the ZnO concentration in the electrolyte was 5 g/L,the corrosion rate was more than ten times lower compared to the MAO coatings without ***,the antibacterial efficacy of ZnO+MAO coating,prepared with a ZnO concentration of 5 g/L,surpassed 95%after 24 h of co-culturing with Staphylococcus aureus(***).The nano-ZnO+MAO-coated alloy exhibited exceptional degradation resistance,corrosion resistance,and antibacterial effectiveness.

关键词： Nano-ZnO Micro-arc oxidation(MAO)coating ZK60 alloy Corrosion behavior Antibacterial characteristics

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Crevice corrosion of reinforcing steel in carbonated simulated concrete pore solutions contaminated by chloride

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Journal of Iron and Steel Research International 2025年第1期32卷 293-311页

作者： Peng-peng Wu Yuan-pei Gong Shao-hua Zhang Yue-zhong Zhang Bao-sheng Liu Guang-ling Song College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan030024ShanxiChina College of Chemical Engineering and Technology Taiyuan University of Science and TechnologyTaiyuan030024ShanxiChina Department of Ocean Science and Engineering Southern University of Science and TechnologyShenzhen518055GuangdongChina School of Mechanical and Mining Engineering Centre for Advanced Materials Processing and Manufacturing(AMPAM)The University of QueenslandSt LuciaQLD4072Australia State Key Laboratory of Physical Chemistry of Solid Surfaces Xiamen UniversityXiamen361005FujianChina

The crevice corrosion of the reinforcing steel in the carbonated simulated concrete pore solutions(SCPSs)containing 0.04 mol/L chloride was *** comparison,the steel without crevice covered on its surface was also *** showed that the crevice corrosion in the uncarbonated SCPS was not triggered and the steel remained passivity by suppressing the anodic dissolution in the crevice *** SCPS was carbonated to have pH values of 10.5 and 11.5,the crevice corrosion was easier to be activated than the widely reported pitting corrosion owing to the rapid oxygen depletion within the crevice,but the crevice corrosion damage might be alleviated to a certain extent due to the relative compact surface film formed inside the *** further carbonation led to the activation dissolution of both the crevice interior and exterior,causing the more serious corrosion *** process of the crevice corrosion was systematically analyzed by combining the electrochemical measurement results and Evens polarization diagram.

关键词： Crevice corrosion Reinforcing steel Carbonation Electrochemical test Rust Evens polarization diagram

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