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Obtaining extremely low coercivity of high Bs FeCoBSiCPCu nanocrystalline alloys through modulation of magnetic anisotropy

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材料科学技术（英文版） 2025年第4期207卷 105-112页

作者： Mingjuan Cai Zhijun Guo Lei Li Xingyu Zheng Xiaoxuan Yang Qianqian Liu Gaopeng Zou Baolong Shen School of Materials Science and Engineering Jiangsu Key Laboratory for Advanced Metallic Materials Southeast UniversityNanjing 211189PR China

Longitudinal magnetic field annealing is utilized for modifying the magnetic anisotropy and enhancing the magnetic softness of Fe75Co8(B10Si3C3P1)1-x/17Cux(x=0.5,0.75,1,1.25)nanocrystalline *** of the magnetic field-annealed nanocrystalline alloys with Cu content more than 0.5 at.％exhibit signifi-cantly improved soft-magnetic properties,including high saturation magnetic flux density up to 1.87 T,effective permeability of 13,000-16,000 under the condition of 1 A/m and 1 kHz,coercivity as low as 1.6 A/m,and core loss of 0.11-0.45 W/kg under the condition of 1.0 T and 50 *** application of a magnetic field promotes the nucleation and inhibits the growth of grains,leading to an increase in the number density of nanocrystals and the crystalline volume fraction,and a reduction in the grain *** magnetic field annealing reduces the effective magneto-crystalline anisotropy energy to 2-4 J/m3,and induces longitudinal magnetic anisotropy with anisotropy energy density of 400-900 J/m3 which shows dependence on the crystalline volume *** field-induced magnetic anisotropy dominates over the random local magnetic anisotropies,and results in the formation of regular magnetic domains aligned longitudinally,pinning-free domain wall displacement,and thus enhanced soft-magnetic proper-ties.

关键词： Nanocrystalline alloy Magnetic anisotropy Magnetic field annealing Soft-magnetic property Microstructure

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In situ construction of Cu(Ⅰ)-Cu(Ⅱ) pairs for efficient electrocatalytic nitrate reduction reaction to ammonia

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Journal of Energy Chemistry 2025年第1期100卷 106-113页

作者： Muyun Zheng Yuchi Wan Leping Yang Shen Ao Wangyang Fu Zhengjun Zhang Zheng-Hong Huang Tao Ling Feiyu Kang Ruitao Lv State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Institute of New Energy Materials and Engineering School of Materials Science and EngineeringFuzhou UniversityFuzhou 350108FujianChina Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education Tianjin Key Laboratory of Composite and Functional MaterialsSchool of Materials Science and EngineeringTianjin UniversityTianjin 300072China

Electrocatalytic nitrate reduction reaction (NO_(3)-RR) to ammonia under ambient conditions is expected to be a green process for ammonia synthesis and alleviate water pollution *** report a CuO nanoparticles incorporated on nitrogen-doped porous carbon (CuO@NC) catalyst for NO_(3)-*** of Cu(Ⅱ) is reduced to Cu(Ⅰ) during the NO_(3)-RR process to construct Cu(Ⅰ)-Cu(Ⅱ) pairs,confirmed by in situ X-ray photoelectron spectroscopy (XPS) and Raman *** functional theory (DFT) calculations indicated that the formation of Cu(Ⅰ) could provide a reaction path with smaller energy barrier for NO_(3)-RR,while Cu(Ⅱ) effectively suppressed the competition of hydrogen evolution reaction (HER).As a result,CuO@NC catalyst achieved a Faradaic efficiency of 84.2% at -0.49 V versus reversible hydrogen electrode (RHE),and a NH_(3)yield rate of 17.2 mg h^(-1)mg^(-1)*** -0.79 V ***,higher than the HaberBosch process (<3.4 g h^(-1)g^(-1)cat.).This work may open a new avenue for effective NO_(3)-RR by modulating oxidation states.

关键词： Ammonia synthesis Cu oxidation state Electrochemistry Nitrate reduction In situ XPS

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Heterogeneous β-Co（OH）2/Cu2（OH）3Cl bifunctional electrocatalyst for superior concurrent conversion of glycerol and nitrite

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Journal of Energy Chemistry 2025年第5期104卷 185-193页

作者： Mingdan Wang Pengzuo Chen Huigang Wang Yanying Zhao School of Chemistry and Chemical Engineering Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province Zhejiang Sci-Tech University Hangzhou Institute of Advanced Studies Zhejiang Normal University

The electrochemical biomass valorization of industrial by-products or pollutants using renewable electricity offers significant promise for carbon ***,the huge challenges still exist in the development of efficient bifunctional ***,we put forward a high-efficiency coelectrolysis system by coupling the nitrite reduction reaction （NO2RR） and the glycerol oxidation reaction（GOR） over a novel heterogeneous β-Co（OH）2/Cu2（OH）3Cl *** β-Co（OH）2/Cu2（OH）3Cl shows excellent bifunctional performance with high Faradaic efficiencies of formate （90.1%） and NH3（91.9%）at cell voltage of 1.5 V,high yield rate of formate (89.6 mg h-1cm-2) and NH3(36.07 mg h-1cm-2) at cell voltage of 1.9 V,and superior stability in an anion exchange membrane *** in-situ Raman result confirms the unique Co/Cu-based bimetallic synergistic sites of β-Co（OH）2/Cu2（OH）3Cl towards superior GOR performance,while the operando Fourier transform infrared spectroscopy demonstrates the improved protonation kinetics of key intermediates and optimized water dissociation ability of β-Co（OH）2/Cu2（OH）3Cl for high NO2RR *** work illuminates alternative avenues to exploit the innovative and energy-saving technology for the co-production of high-added chemicals.

关键词： Bifunctional performance Glycerol oxidation reaction Heterogeneous catalyst Nitrite reduction reaction β-Co(OH)2/Cu2(OH)3Cl

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Synergistic Enhancement of Mechanical Properties and Electrical Conductivity of Immiscible Bimetal:A Case Study on W–Cu

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engineering 2025年第3期46卷 224-235页

作者： Qixiang Duan Chao Hou Tielong Han Yurong Li Haibin Wang Xiaoyan Song Zuoren Nie Key Laboratory of Advanced Functional Materials Ministry of EducationCollege of Materials Science and EngineeringBeijing University of TechnologyBeijing 100124China

Immiscible bimetal systems,of which tungsten–copper(W–Cu)is a typical representative,have crucial applications in fields requiring both mechanical and physical ***,it is a major challenge to determine how to give full play to the advantages of the two phases of the bimetal and achieve outstanding comprehensive *** this study,an ultrafine-grained W–Cu bimetal with spatially connected Cu and specific Wislands was fabricated through a designed powder-mixing process and subsequent rapid low-temperature *** prepared bimetal concurrently has a high yield strength,large plastic strain,and high electrical *** stress distribution and strain response of individual phases in different types of W–Cu bimetals under loading were quantified by means of a *** high yield strength of the reported bimetal results from the microstructure refinement and high contiguity of the grains in the W islands,which enhance the contribution of W to the total plastic deformation of the *** high electrical conductivity is attributed to the increased mean free path of the Cu and the reduced proportion of phase boundaries due to the specific phase combination of W islands and *** work provides new insight into modulating phase configuration in immiscible metallic composites to achieve high-level multi-objective properties.

关键词： Immiscible bimetal Phase configuration Mechanical property Electrical conductivity Strain response

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Insight into the Solution Self-Assembly of Amphiphilic Asymmetric Brush Copolymers via Computer Simulations

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Chinese Journal of Polymer science 2025年第1期43卷 132-140,I0010页

作者： Wei-Ting Zeng Wei-Sheng Feng Xing Zhang Yuan Yao Bin-Bin Xu Shao-Liang Lin Shanghai Key Laboratory of Advanced Polymeric Materials Key Laboratory for Ultrafine Materials of Ministry of EducationFrontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai200237China

Amphiphilic asymmetric brush copolymers(AABCs)possess unique self-assembly behaviors owing to their asymmetric brush architecture and multiple functionalities of multicomponent side ***,the synthesis of AABCs presents challenges,which greatly limits the exploration of their self-assembly *** this work,we employed dissipative particle dynamics(DPD)simulations to investigate the self-assembly behaviors of AABCs in selective *** varying the copolymer concentration and structure,we conducted the self-assembly phase diagrams of AABCs,revealing complex morphologies such as channelized micelles with one or more solvophilic ***,the number,surface area,and one-dimensional density distribution of the channelized micelles were calculated to demonstrate the internal structure and morphological transformation during the self-assembly *** findings indicate that the morphology of the internal solvophilic channels is greatly influenced by the copolymer structure,concentration,and interaction parameters between the different side *** simulation results are consistent with available experimental observations,which can offer theoretical insights into the self-assembly of AABCs.

关键词： Dissipative particle dynamics Brush copolymer Self-assembly Channelized micelle

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Low-temperature rapid sintering for the fabrication of biphasic Si3N4 ceramics with outstanding mechanical properties

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Journal of advanced Ceramics 2025年第3期14卷 143-150页

作者： Shuo Zhao Songmo Du Shijia Zhang Dengke Zhao Binbin Fan Bohan Wang Fei Li Kexin Chen Guanghua Liu State Key Laboratory of New Ceramic Materials School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

The fabrication of Si3N4 ceramics typically requires high temperatures(above 1700℃)and prolonged sintering time to achieve densification,resulting in high energy consumption and increased manufacturing ***,reports on the fabrication of dense Si3N4 ceramics with good mechanical properties under MPa-level pressure and low temperatures are *** this work,we propose a low-temperature rapid spark plasma sintering strategy involving the introduction of fine-grainedβ-Si3N4 powder with high lattice strain energy as an“additive”.Dense biphasic Si3N4 ceramics,predominantlyα-Si3N4,were successfully fabricated at a mechanical pressure of 200 MPa and a temperature of 1300℃,achieving a relative density of 97%.The application of high pressure promoted particle rearrangement and uniform liquid‒phase distribution,providing additional driving forces for *** introduction ofβ-Si3N4 seeds facilitated an in-situ solution–reprecipitation process,enabling rapid densification with a minimal liquid phase and without significant grain growth,resulting in nanometer-scale *** Si3N4 sample prepared at 1350℃ exhibited a desirable combination of high hardness(18.5±0.3 GPa)and fracture toughness(6.7±0.2 MPa·m_(1/2)).The results demonstrate that by adjusting the sintering temperature and time,the phase composition and mechanical properties of the ceramics can be flexibly *** work holds significant potential for industrial manufacturing and provides valuable insights into low-temperature strategies for ceramic fabrication.

关键词： low temperature sintering silicon nitride β-Si3N4 seeds spark plasma sintering(SPS)

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Computational study of the effect of friction coefficients and particle shape on the repose angle and porosity of sinter piles

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Particuology 2025年第3期98卷 231-240页

作者： Meng Li Yaowei Yu Henrik Saxén Process and Systems Engineering Laboratory Faculty of Science and EngineeringÅbo Akademi University20500TurkuFinland State Key Laboratory of Advanced Special Steel Shanghai Key Laboratory of Advanced FerrometallurgySchool of Materials Science and EngineeringShanghai University200444ShanghaiChina

Shape has an undeniable impact on particle behaviour,and the shapes of naturally occurring granular matter are typically *** studies of irregularly shaped particles are challenging but necessary to gain a better understanding of the flow of particulate *** study focuses on the behaviour of irregular sinter particles and applies the discrete element method to examine the effects of static and rolling friction coefficients and particle shape on the angle of repose and porosity of sinter piles.A three-dimensional model of an irregular sinter particle reconstructed by close-range photogrammetry served as the template for generating multi-sphere particles with varying numbers of sub-spheres(1,3,7,22,and 135)and sphericity ranging from 1 to *** of particle piles were conducted for a range of values of the coefficients of static and rolling *** results indicate that the angle of repose increases with static friction and also increases with rolling friction coefficient when it is lower than the static *** angle of repose shows clear dependence on particle shape,particularly for lower rolling friction *** friction coefficients for particles of five different shapes were individually determined through bulk calibration,and irregularly shaped particles in DEM were found to require lower friction *** was marginally affected by the static and rolling friction coefficients for spherical particles,while non-spherical particles showed porosity increasing with the rolling friction *** relationship between particle sphericity and porosity was nonlinear:as sphericity decreases from 1.00 to 0.69,the porosity first decreases to a minimum and then *** findings confirmed that both friction and particle shape have a significant influence on the structure of sinter piles,with implications for material handling and processing in industrial applications.

关键词： Sinter Discrete element method Friction coefficients Particle shape Repose angle Porosity

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Evidence of microstructural evolution linked to non-monotonic distribution of micromechanical properties induced by shot peening

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材料科学技术（英文版） 2025年第4期207卷 238-245页

作者： Guoxin Lu Qiang Wang Bonnie Attard Huhu Su Shijian Zheng Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of EducationSchool of Materials Science and EngineeringShandong UniversityJinan250061China Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material AECC Beijing Institute of Aeronautical MaterialsBeijing100095China Department of Metallurgy and Materials Engineering University of MaltaMSD2080Malta Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology School of Materials Science and EngineeringHebei University of TechnologyTianjin300130China

The residual stress field induced by surface strengthening processes such as mechanical shot peening and other forms of plastic deformation does not generally exhibit a simple"monotonic"distribution *** researchers have analyzed this fact from a mechanical perspective based on Hertz ***,the micro/nano-scale microstructural changes corresponding to the distribution of residual stress fields still appear to be *** this study,we focused on a widely used material in aviation manufacturing,namely nickel-based superalloy GH4169,as our experimental *** subjected GH4169 alloy to me-chanical strengthening treatment using a shot peening intensity of 0.25 mmA,followed by quantitative testing of micromechanical performance indicators such as microhardness and residual *** thor-oughly investigate the relationship between micromechanical properties and microstructure changes,we utilized transmission electron microscopy(TEM)to observe and analyze shot-peened materials at differ-ent *** findings revealed that the most severe microstructural distortion induced by mechanical shot peening in GH4169 alloy was likely to occur within a depth range of 25 to 75 *** observation aligns with the actual phenomenon that the maximum microhardness and maximum residual compres-sive stress did not manifest on the outermost surface of the *** presenting a detailed analysis of deformation defects such as dislocations,stacking faults,and twinning in different depths of mechan-ically strengthened layers,our study contributes to a deeper understanding and practical application of post-processing technologies based on plastic deformation.

关键词： Mechanical shot peening Surface strengthening Residual stress Microstructure

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A facile data-driven battery capacity estimation framework for on-road plug-in hybrid electric vehicle

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Progress in Natural science:materials International 2025年第1期35卷 166-176页

作者： Jianlu Li Yanming Chen Tongxing Lei Jianguo Liu Guizheng Liu Zhaoyang Deng Xuebiao Wu Zhiyu Ding Yinghe Zhang Junwei Wu Yanan Chen Guangzhou Automobile Group Co. Ltd. School of Materials Science and Engineering Harbin Institute of Technology School of Materials and Environmental Engineering Shenzhen Polytechnic University School of Science Shenzhen Key Laboratory of Flexible Printed Electronics Technology Shenzhen Key Laboratory of Advanced Functional Carbon Materials Research and Comprehensive Application Harbin Institute of Technology School of Materials Science and Engineering Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education Tianjin Key Laboratory of Composite and Functional Materials Tianjin University

A data-driven framework with strong generalization capabilities is proposed to effectively extract features and easily access battery capacity. This framework can make highly accurate predictions for the battery capacities of plug-in electric vehicles. The feature extraction process is entirely based on statistics, which are always available and can be generalized to various types of battery data. An improved ampere-hour integral method can easily access battery capacity with just short-charging segments lasting 500 s. Several machine-learning models are trained to verify the framework's effectiveness, with the best model achieving a test error of 0.84 % based on leave-one-out validation. SHAP values are used to provide a reasonable interpretation of the relationships between the constructed features and model outputs. The proposed framework offers advantages such as reduced computational resources, wide generalization, and high prediction accuracy, showing great potential for battery management.

关键词： Battery capacity estimation Data-driven framework Lithium-ion battery Machine learning Plug-in hybrid electric vehicle

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Regulation of solvation structure and electrochemical performance optimization in Zn（NH2SO3）2-based electrolytes

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Journal of Energy Chemistry 2025年第5期104卷 644-654页

作者： Lei Liu Ruxue Yan Songyan Jiang Xiao Liu Zhonghua Zhang Xiaosong Guo Xingguang Liu Jun Zheng Guicun Li College of Materials Science and Engineering Qingdao University of Science and Technology Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials Anhui University of Technology

Monovalent anions,with relatively low charge density,exhibit weak bond energy with Zn2+ions,which facilitates the solubility of Zn salts and the regulation of solvation *** this study,zinc bis（aminosulfate）(Zn（NH2SO3）2) with a monovalent anion,NH2SO3-,was synthesized and dissolved in different ratios of dimethyl sulfoxide （DMSO） and H2O as electrolytes for Zn-ion batteries （ZIBs）.From the perspective of game theory,the influences of DMSO and H2O on the solvation structure and electrochemical performance of the Zn（NH2SO3）2based electrolytes has been meticulously *** and spectra analysis indicate that DMSO molecules are reluctant to penetrate the primary solvation structure of Zn2+***,increasing DMSO in electrolytes can induce a transition from solvent-separated ion pairs （SSIP） to contact ion pairs （CIP）,resulting in an enrichment of anions in the primary solvation *** alteration can significantly suppress parasitic reactions,enhance nucleation density,and refine the deposition morphology during the Zn plating process,leading to superior cyclic stability and high coulombic efficiency （CE） of Zn//Cu and Zn//Zn ***,the enrichment of anions in the primary solvation structure also inhibits the activity of Zn2+ions,amplifies the polarization effect,and engenders a sluggish ionization dynamics,resulting in the low energy conversion efficiency of the *** findings underscore the influence of the anion ratio within the primary solvation structure on electrochemical properties of electrolytes for ZIBs,which may be a pivotal determinant in the Zn deposition process.

关键词： CIP Game theory Impressed current cathodic protection Monovalent anion Primary solvation structure

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