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The Mechanism of Heating Rate on the Seco.dary Recrystallization Evolution in Grain Oriented Silico. Steel

Journal of Wuhan University of Technology(materials Science) 2025年第1期40卷 275-282页

作者： GAO Qian LI Jun WANG Xianhui CAO Laifu GONG Jian LI Bo Central Iron and Steel Research Institute Group Beijing 100081China Shougang Zhixin Electromagnetic material R&D(Beijing)co. Ltd.Beijing 101300China Beijing Shougang co. Ltd.Qian’an 064404China

Grain-oriented silico. steels were prepared at different heating rates during high temperature annealing,in which the evolution of magnetic properties,grain orientations and precipitates were *** illustrate the Zener factor,the diameter and number density of precipitates of interrupted testing samples were statistically *** effect of precipitate ripening on the Goss texture and magnetic property was *** indicated that the trend of Zener factor was similar under different heating rates,first increasing and then decreasing,and that the precipitate maturing was greatly inhibited as the heating rate *** recrystallization was developed at the temperature of 1010℃when a heating rate of 5℃/h was used,resulting in Goss,Brass and{110}oriented grains growing abnormally and a magnetic induction intensity of ***,increasing the heating rate to 20℃/h would inhibit the development of undesirable oriented grains and obtain a sharp Goss ***,when the heating rate was extremely fast,such as 40℃/h,poor seco.dary recrystallization was developed with many island grains,co.responding to a decrease in magnetic induction intensity to 1.87 *** a suitable heating rate of 20℃/h,the sharpest Goss texture and the highest magnetic induction of 1.94 T with an onset seco.dary recrystallization temperature of 1020℃were found among the experimental variables in this *** heating rate affected the initial temperature of seco.dary recrystallization by co.trolling the maturation of precipitates,leading to the deviation and dispersion of Goss texture,thereby reducing the magnetic properties.

关键词： high temperature annealing heating rate seco.dary recrystallization grain oriented silico. steel

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Microstructural design in LaCe misch-metal substituted 2:14:1-type sintered magnets by dual-alloy method

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Journal of Rare Earths 2021年第3期39卷 305-311,I0003页

作者： Kan Chen Shuai Guo Hongliang Zhao Xiaodong Fan Fengchun Fan Guangfei Ding Renjie Chen Xiwen Zheng Aru Yan Key Lab of magnetic materials and Devices Ningbo Institute of Macerials Technology and EngineeringChinese Academy of SciencesNingbo 315201China ningbo tongchuang strong magnet material co. Ltd.Ningbo 315201China

LaCe-based sintered magnets with different microstructural features and distinct rare earth elemental distribution were designed by dual-alloy *** sample prepared by fine LaCe-co.taining powder and co.rse LaCe-free powder possesses higher remanence(~13.41 kGs),whereas another sample prepared by fine LaCe-free powder and co.rse LaCe-co.taining powder possesses higher co.rcivity(~5.67 kOe).Additionally,these samples are with the same nominal co.positions and their elemental distribution features are obviously different in matrix grains *** remanence difference is mainly affected by the saturation magnetization difference caused by the distribution variation of the rare earth elements at the matrix *** co.rcivity difference is affected by the co.ponent of the grain boundary phase between the adjacent grains and the distribution variation of the rare earth elements at the matrix *** findings may provide a new prospect for the utilization of LaCe mischmetal in 2:14:1-type permanent magnets.

关键词： Misch-metal Microstructural design Sintered magnet Rare earths

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Effects of Ti-and Nb-based transition element from single to multiple co.pound oxides and carbon-based co.posite additives on Mg-MgH2 hydrogen storage material

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Tungsten 2025年第1期7卷 32-49页

作者： Li-Rong Xiao Chen Chen Shuo Wang Zi-Yin Dai Hideo Kimura Cui Ni Chuan-Xin Hou Xue-Qin Sun Si-Jie Guo Wei Du Xiu-Bo Xie School of Environmental and material Engineering Yantai University Bosch HUAYU Steering Systems (Yantai) co. Ltd.Ytp/MFE University of Tennessee Knoxville Shandong Key Laboratory of Eco.Environmental Science for the Yellow River Delta Shandong University of Aeronautics

MgH2is co.sidered as a promising hydrogen storage material for its high hydrogen storage capacity,low co.t and abundant resource ***,the low kinetics and high enthalpy formation of MgH2limit its wide *** the perspective of adding catalysts to enhance the hydrogen storage properties of Mg-MgH2,this article elaborated the main catalysts based on Ti and Nb transition elements,including single oxide catalysts,binary oxides catalysts（co.bined with Ni,Na,Sr,V,etc.）,multiple catalysts bound to carbon,and co.posite catalysts with Ti and Nb elements co.bined with MXene ***,the main pathways of various catalysts to reduce the reaction activity and broaden the hydrogen desorption channel were also *** Ti-based catalysts can enhance the reactive sites of the matrix by forming multivalent states,while Nb-based catalysts broaden the hydrogen reaction channels by forming tiny *** improving the size structure and enhancing the grain size stability,co.bined with carbon materials should be the future co.siderations.

关键词： Catalysts Mg-based hydrogen storage alloys Solid hydrogen storage Transition metal elements

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Experimental Observing Damage Evolution in Cement Pastes Exposed to External Sulfate Attack by in situ X-ray co.puted Tomography

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Journal of Wuhan University of Technology(materials Science) 2025年第1期40卷 164-170页

作者： WU Min CAO Kailei XIAO Weirong YU Zetai CAO Jierong DING Qingjun LI Jinhui China Railway co.struction co.poration Harbour and Channel Engineering Bureau Group co. LTDZhuhai 519000China co.-struction Headquarters of Zhoushan Liuheng Bridge Phase II Project Zhoushan 316000China China Railway co.struction Bridge En-gineering Bureau Group co. LTDTianjin 300000China State Key Laboratory of Silicate material for Architecture(Wuhan University of Technology) Wuhan 430070China co.lege of materials Science and Engineering Wuhan Textile UniversityWuhan 430200China

The paper presents experimental investigation results of crack pattern change in cement pastes caused by external sulfate attack(ESA).To visualize the formation and development of cracks in cement pastes under ESA,an X-ray co.puted tomography(X-ray CT)was used,i e,the tomography system of Zeiss Xradia 510 *** results indicate that X-CT can monitor the development process and distribution characteristics of the internal cracks of cement pastes under ESA with attack *** addition,the C3A co.tent in the cement significantly affects the damage mode of cement paste specimens during sulfate *** damage of ordinary Portland cement(OPC)pastes subjected to sulfate attack with high C3A co.tent are severe,while the damage of sulfate resistant Portland cement(SRPC)pastes is much smaller than that of OPC ***,a quadratic function describes the co.relation between the crack volume fraction and development depth for two cement pastes immermed in sulfate solution.

关键词： co.crete external sulfate attack damage evolution situ X-ray co.puted tomography

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Effect of yttrium substitution on magnetic properties and service performances of Nd-Fe-B sintered magnets

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Journal of Rare Earths 2023年第1期41卷 116-121页

作者： Xiaodong Fan Shuai Guo Guangfei Ding Sining Fan Zhehuan Jin Renjie Chen Shukai Zhang Aru Yan CAS Key Laboratory of magnetic materials and Devices Ningbo Institute of Material Technology and EngineeringChinese Academy of SciencesNingbo 315201China Chinalco.Shandong Yinuowei strong magnetic material co. LtdTaian 271600China

We successfully fabricated partial Y substituted NdY-Fe-B magnets with nominal co.positions of(Nd_(1-x)Y_(x))_(13.80)Fe_(ba1)Al_(0.24)Cu_(0.1)B_(6.04)(at%,x=0,0.1,0.2,0.3,0.4) by powder metallurgy process and the magnetic properties as well as service performances of the magnets were also systematically *** phase co.stituents of the magnets have no obvious variation within the whole range of Y co.tent,while the main phase grains form in-situ co.e-shell structure where Y gathers in the co.e and Nd mainly distributes in the *** with pure Nd-Fe-B magnets,the magnetic performances of Y substituted magnets slightly decrease on acco.nt of the poor intrinsic magnetic properties of Y_(2)Fe_(14)***,the μ_(O)M_(r),μ_(O)H_(cj) and(BH)_(max) of the 20 at% Y magnet still remain at a high level of 1.325 kG,1.173 kOe and 342.884 kj/m^(3),which approaches the performances of co.mercial N45-grade *** service performances of Y substituted magnets indicate that though the surface co.rosion products and Vickers hardness of the NdY-Fe-B magnets increase to a certain extent co.pared to Nd-Fe-B,the magnets with Y substitution still display relatively good service ***,on the basis of sacrificing little partial magnetic and service performances,Y substituted Nd can still prepare NdY-Fe-B medium-grade *** this way,we achieve the balanced utilization of rare earth resources,which has significant meanings for the industry and scientific research.

关键词： Y substitution magnetic properties Service performances Nd-Fe-B sintered magnets Rare earths

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High cerium co.tent(Nd-Pr-Ce)_(2)Fe_(14)B melt-spun ribbons with high co.rcivity

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Journal of Rare Earths 2024年第4期42卷 690-695页

作者： Yujiang Zhong Junming Wang Zikai Yuan Ruijin Liu Minggang Zhu Zhe Liu Xin Chen Wei Li Zhaohui Guo Division of Functional materials Central Iron and Steel Research InstituteBeijing100081China ningbo Jinji strong magnetic material co. Ltd.Ningbo315172China Jiangxi Jiangwu Rare Metal New material co. Ltd.Nanchang330013China

The effects of wheel speeds on the magnetic properties and microstructures of[(Nd,Pr)_(1-x)Ce_(x)]-Fe-B meltspun ribbons were *** to melt-spun ribbons with low cerium(Ce)co.tent(x=0.2),amorphous formation can be suppressed at high wheel speed in the ribbons with a relatively high Ce co.tent(x=0.8),and with the increase of the wheel speed,the magnetic properties of the ribbons with high Ce co.tent raise *** high wheel speed,the co.rcivity mechanism of melt-spun ribbons is mainly pinning field,and the high wheel speed introduces a large number of defects into the matrix as pinning ***,ribbons with high Ce co.tent form a fine and uniform grain structure,so the grain boundary area enlarges,which further hinders the movement of domain *** co.bined effects of the above factors enable ribbons with high Ce co.tent to have excellent magnetic properties(Hcj=0.977 T,Mr=64 m^(2) A/kg)at the wheel speed of 35 m/s.

关键词： Wheel speed Ceco.tent Microstructure magnetic properties Rare earths

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A co.parative study of NdY-Fe-B magnet and NdCe-Fe-B magnet

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Journal of Rare Earths 2022年第9期40卷 1480-1487,I0006页

Low co.t and high abundance rare earth elements Y and Ce have attracted tremendous interests of the industrial and scientific societies for fabricating the highly co.t-performance efficient rare earth permanent ***,the effect of separate replacement of Nd by Y or Ce on the performances of NdFeB-type magnet under the same atomic ratio and preparation co.ditions is still *** this work,we systematically investigated the magnetic properties,thermal stabilities and service performances of(Nd_(0.8)Y_(0.2))_(13.80)Fe_(bal)Al_(0.24)Cu_(0.1)B_(6.04)(atomic fraction,denoted as 20 Y)and(Nd_(0.8)Ce_(0.2))_(13.80)Fe_(bal)Al_(0.24)Cu_(0.1)B_(6.04)(atomic fraction,denoted as 20 Ce)*** results demonstrate that theμ_(0)M_(r),μ_(0)H_(c)and(BH)_(max)of 20 Y magnet are respectively 1.325 T,1.173 T and 343.467 kJ/m^(3),which are co.prehensively higher than those of 20 Ce magnet(μ_(0)M_(r)=1.310 T,μ_(0)H_(c)=0.948 T,(BH)_(max)=321.105 kJ/m^(3)).Moreover,the 20 Y magnet has higher thermal stability co.pared with 20 Ce magnet which is favorable for the magnetic performances at elevated *** investigation of micro structure and elemental distribution indicates that the excellent magnetic performance s of NdY-Fe-B magnet can be attributed not only to the preferable intrinsic properties4πM_(s),H_(s)and T_(c)of Y_(2)Fe_(14)B,but also to the in-situ co.re-shell structure of the 2:14:1 matrix phase grain with Yrich co.e and Nd-rich shell,along with the thicker grain boundary layer between the adjacent matrix phase grains in NdY-Fe-B ***,the 20 Y magnet exhibits better mechanical property and higher co.rosion resistance than 20 Ce magnet,which are helpful for prolonging the service life of the magnet in practical application.

关键词： NdY-Fe-B NdCe-Fe-B magnetic properties Thermal stabilities Service performances Rare earths

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Study on Dynamic Mechanical Behavior of Al-Mg-Si Alloy

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Journal of Wuhan University of Technology(materials Science) 2024年第2期39卷 454-462页

作者：陶小旺 LIU Jibo LIU Xianbin CHEN Jianbin WANG Yonggang 汪小锋 Key Laboratory of Impact and Safety Engineering Ministry of EducationNingbo UniversityNingbo 315211China ningbo Zhanci New material co. Ltd.Ningbo 315338China

The dynamic mechanical behavior of Al-Mg-Si alloy was investigated under different strain rates by mechanical property and microstructure characterization,co.stitutive behavior analysis and numerical simulation in the present *** the strain rate increases,the yield strength,ultimate tensile strength and elongation increase first,then remain almost co.stant,and finally *** alloy always exhibits a typical ductile fracture mode,not depending on the strain ***,as the strain rate increases,the number of dimples gradually *** deformation can refine grains,however,the grain structure is slightly affected by the strain *** optimized Johnson-co.k co.stitutive equation was used to describe the mechanical behavior and obtained by fitting the true stress-strain *** parameter C was described by a function related to the strain *** fitting true stress-strain curves by the JC model agree very well with the experimental true stress-strain *** true stress-strain curves calculated by the finite element numerical simulation agree well with the experimental true stress-strain curves.

关键词： Al-Mg-Si alloy strain rate mechanical property microstructure Johnson-co.k model finite element simulation

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Influence of the electroplating pretreatment on co.rosion mechanism of NdFeB magnets

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Journal of Rare Earths 2016年第2期34卷 152-157页

作者：周巧英李刚刘壮郭帅闫阿儒李东李建忠 Key Laboratory of magnetic materials and Devices Ningbo Institute of Material Technology and Engineering Chinese Academy of Sciences ningbo Permanent magnetics co. Ltd.

The electroplating pretreatment of NdFeB magnets was simulated in this study, and the effect of the pickling process on element, matrix morphology and texture was discussed. The results showed that in the ordinary circumstance the acid solution co.-centration should be below 4 mol/L and the pickling time was within 120 s. However the co.centration was lower than 1 mol/L and the time was about 30 s in the ultrasonic environment. The preco.ting technology sequentially was studied. The results revealed that there were two main reactions of the co.rosion and displacement in the preco.ting process, and these two reactions were more obvi-ous in the grain boundary. The electrochemical analysis illustrated that the co.rosion and displacement reactions were affected obvi-ously by the current density and the preco.ting solution temperature, usually the current density was co.trolled about 0.3 A/dm2, and the temperature was about 318 K in the preco.ting process.

关键词： NdFeB magnet pickling preco.ting co.rosion pretreatment rare earths

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Synergistically enhanced ORR and HER performance on co.N-C co.pled in-situ generated Ptco.intermetallic

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Journal of Energy Chemistry 2025年第1期100卷 721-729页

作者： Guanyu Luo Min Song Lulu An Xiao Huang Qian Zhang Chenhao Zhang Tao Shen Shuang Wang Deli Wang Key Laboratory of material Chemistry for Energy co.version and Storage (Huazhong University of Science and Technology) Ministry of Education School of Chemistry and Chemical Engineering Huazhong University of Science and Technology

Integrating multi-scale sites in a co.posite catalyst is vital to realize efficient ***,a synergistic co.posite catalyst co.sisting of co.atomic sites and in-situ generated Ptco.intermetallic co.pounds （IMCs）(o-Ptco.co.C) is proposed through co.pre-anchoring and subsequent impregnation-reduction *** loading of co.atoms provides a chance for in-situ generating Ptco.ordered intermetallic *** remaining co.single atoms and Ptco.IMCs co.struct synergistic electrocatalytic *** from the ordered structure,synergistic effect of Pt co.IMCs and co.single atoms,o-Ptco.co.C exhibits excellent electrocatalytic performance for oxygen reduction reaction （ORR） and hydrogen evolution reaction （HER） with mass activity of 1.21 A mgPt-1（at 0.9 V） and5.70 A mgPt-1（at an overpotential of 100 mV）,***,o-Ptco.co.C delivers negligible loss of half-wave potential and overpotential during long-term stability test in acid solutions,with 13 mV decay after 50,000 potential cycles for ORR and a 2.7 mV decay after 20,000 potential cycles for *** integration strategy of single-atomic sites co.pled IMCs paves the way for enhancing the activity and durability of Pt-based electrocatalysts.

关键词： Synergistic effect Intermetallics Single atomic sites Oxygen reduction reaction Hydrogen evolution reaction

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