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Micron-scale 1:5H-based precipitated phase with the lamellar structure of sintered Sm_(2)Co_(17)-based magnets and its potential application

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Journal of Materials Science & Technology 2023年第22期153卷 159-165页

作者： Nengjun Yu Yingchang Li Zesong Ren minxiang pan Hangfu Yang Qiong Wu Hongliang Ge Minggang Zhu Wei Li College of Materials and Chemistry China Jiliang UniversityHangzhou 310018China Division of Functional Materials Research Central Iron and Steel Research InstituteBeijing 100081China

The excellent thermal stability of magnetic properties of Sm_(2)Co_(17)-based magnets is their most impor-tant ***,this stability is reduced when the maximum energy product of Sm_(2)Co_(17)-based magnets is improved,which is mainly determined by the Fe/Cu distribution of the 2:17R cell and 1:5H cell boundary *** the demagnetization process,the Cu-rich 1:5H cell boundary phase with a width of 2-15 nm obstructs the motion of the domain walls,yielding ***,we report a micron-scale Cu/Zr-rich and Fe-lean 1:5H-based precipitated phase with a lamellar structure,probably induced by Sm_(2)O_(3) *** structure enables the separate regulation of Fe and Cu distribution for Sm_(2)Co_(17)-based magnets with Fe-rich 2:17R cell phases and Cu-rich 1:5H cell boundary phases,consid-erably optimizing the thermal stability of magnetic *** discovery can be further developed to produce Sm_(2)Co_(17)-based magnets with high performance and excellent thermal stability of magnetic properties.

关键词： Sm_(2)Co_(17)-type magnets Thermal stability of magnetic properties 1:5H-based precipitated phase Element distribution

Study on magnetization reversal behavior for annealed Nd2Fe14B/α-Fe nancomposite alloys

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Journal of Rare Earths 2013年第8期31卷 759-764页

作者： ZHANG Pengyue pan minxiang GE Hongliang YUE Ming LIU Weiqiang College of Materials Science & Engineering China Jiliang University Hangzhou 310018 China College of Materials Science & Engineering Beijing University of Technology Beijing 100124 China

Effect of thermal annealing on the magnetization reversal behavior of α-Fe/Nd2Fe14B alloys was investigated. A drastic in- crease of the remanence Mr from 0.67 up to 0.87 T and remanence ratio Mr/Ms from 0.66 up to 0.76, respectively, was observed in the α-Fe/NdEFel413 alloys annealed at 610 ℃ as compared with the as-quenched sample. Whereas the further annealing at 680 ℃ resulted in a strong increase of the corecivity Hc as high as 491 kA/m but a slight decrease in Mr. The analysis result of the magnetization re- versal behavior showed that the maximum value of the integrated recoil loop area about 1.58 kJ/m3 was obtained in the α-Fe/Nd2Fe14B alloys at the annealing temperature of 610℃, significantly lower than other annealed samples. This indicated a sig- nificant advantage for the application of this material as permanent magnets in electrical machines and generators due to a low energy loss.

关键词： nanocomposite magnetization reversal behavior recoil loop rare earths

Magnetic properties and microstructure of Fe69.5-xNd7B21Nb2.5Gax（x=0-1）alloys

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Journal of Rare Earths 2019年第10期37卷 1072-1077页

作者： Yong Gu Zhong Li Zhongyuan Wu minxiang pan Chenxu Wang Xueling Hou Hui Xu Institute of Materials Science Shanghai UniversityShanghai200072China Qianjiang College Hangzhou Normal UniversityHangzhou310036China

The Fe69.5-xNd7 B21Nb2.5Gax(x = 0-1)permanent magnets in the form of rods were prepared by annealing the bulk amorphous *** magnetic properties,phase evolution and microstructure of the alloys were investigated *** is found that the glass forming ability(GFA), microstructure and magnetic properties are sensitive to Ga content for Fe69.5-xNd7 B21Nb2.5Gax(x = 0-1)bulk *** annealed alloys are mainly composed of soft α-Fe,hard Nd2 Fe14B and nonmagnetic Nd1.1Fe4 B4 *** x = 0.3,the optimally annealed magnets exhibit magnetic properties of the remanence Br = 0.63 T,intrinsic coercivity Hcj = 368.68 kA/m and maximum energy product(BH)max = 33.73 kJ/***,magnetic field heat treatment at the temperature close to Curie temperature of Nd2 Fe14B phase was applied to the annealed Fe69.2Nd7 B21Nb2.5Ga0.3 *** results of X-ray diffraction(XRD)and transmission electron microscopy(TEM)indicate that the magnetic field heat treatment can be beneficial for the precipitation of α-***,the Br,Hcj and(BH)max are enhanced by 8.7%,6.3% and 16.3%,respectively.

关键词： Crystallization Magnetic properties Microstructure Magnetic field heat treatment Rare earths

Toward an ideal electrical resistance strain gauge using a bare and single straight strand metallic glassy fiber

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Science China(Physics,Mechanics & Astronomy) 2012年第4期55卷 609-613页

作者： YI Jun HUO LiShan ZHAO DeQian pan minxiang BAI HaiYang WANG WeiHua Institute of Physics Chinese Academy of SciencesBeijing 100190China

Electrical resistance strain gauges(SGs) are useful tools for experimental stress analysis and the strain sensing elements in many electromechanical transducers including load cells,pressure transducers,torque meters,accelerometers,force cells,displacement transducers and so *** commonly used commercial crystalline strain sensing materials of SGs are in the form of wire or foil of which performance and reliability is not good enough due to their low electrical resistivity and incapacity to get thin *** SGs with single straight strand strain sensing materials,which are called ideal SG,are highly desirable for more than seven decades since the first SG was ***,we show the development of a type of minuscule length scale strain gauge by using a bare and single straight strand metallic glassy fiber(MGF) with high resistivity,much smaller lengthscale,high elastic limits(2.16%) and especially the super piezoresistance *** anticipate that our metallic glassy fiber strain gauge(MGFSG),which moves toward the ideal SGs,would have wide applications for electromechanical transducers and stress analysis and catalyze development of more micro-and nanoscale metallic glass applications.

关键词：电阻应变计金属玻璃理想纤维直链实验应力分析机电传感器传感材料

Effect of Ce and La Co-addition on Microstructure and Magnetic Property of Melt-spun [Nd1-x(Ce0.5La0.5)x]16Fe78B6 alloys

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Effect of Ce and La Co-addition on Microstructure and Magnet...

A module based modeling framework for estimating lunar dust deposition due to human activities

中国稀土学会第四届青年学术会议

作者： Bihong Ye minxiang pan Hangfu Yang Nengjun Yu Qiong Wu Hongliang Ge China Jiliang University

Developing the high-abundance rare earth(HARE) elements such as Ce and La to substitute the heavy rare earth elements such as Nd, Tb and Dy is an effective way to promote the balanced development of rare earth resources. So in this work, the effect of co-addition of the Ce and La content on the phase constituent, microstructure, magnetic properties and Curie temperature in the [Nd(CeLa)]FeB(x = 0～0.4) alloys have been systematically investigated. It is observed that proper co-addition of the Ce and La content contributes to the improvement of the corresponding microstructure and magnetic properties. The optimal magnetic characteristics are acquired in the [Nd(CeLa)]FeB sample with x =0.2: H = 11.10 kOe, B = 6.57 kG, H/H = 0.89 and(BH) = 16.63 MGOe. Meanwhile, the analysis of Henkel plots(δM-H) and microstructure show that the well-crystallized nano-grains with uniform intergranular phase and fine grain size is beneficial to enhance the exchange coupling interaction, which is responsible for the better magnetic performance in the Nd-Ce/La-Fe-B alloys.

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Chinese Journal of Aeronautics 2024年第2期37卷 501-510页

作者： Chunjian pan College of Automation Engineering Shanghai University of Electric PowerShanghai 200090China

Lunar dust is considered to be one of the top challenges for enabling humans to have extended stays on the *** activities such as module landings and launches,walking,rover operation and construction activities will inevitably produce a significant amount of ***,it is important to estimate the potential range and intensity of dust deposition caused by these activities to minimize dust accumulation over time and for maintenance planning and execution.A modular model that correlates the dust deposition distribution with initial mean dust particle velocity,its mean ejected angle and the total amount of ejected mass is developed for an elementary mechanical *** modular model is further employed to form a modeling framework to estimate dust deposition of a trajectory based activity of similar repeated movements such as the landing process of a lander,walking and rover *** model forms a unified modeling framework for different trajectory-based activities and is shown to predict consistent and physically meaningful ranges and intensities of dust deposition provided reliable data to calibrate the model parameters.

关键词： Lunar dust Dust deposition Lunar lander Lunar construction Model calibration

Analytical Solutions for an Isotropic Elastic Half-Plane with Complete Surface Effects Subjected to a Concentrated/Uniform Surface Load

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Acta Mechanica Solida Sinica 2024年第3期37卷 371-384页

作者： Xia-Hui pan School of Civil Engineering Henan Polytechnic UniversityJiaozuo454003China

Within the context of Gurtin-Murdoch surface elasticity theory,closed-form analytical solutions are derived for an isotropic elastic half-plane subjected to a concentrated/uniform surface *** the effects of residual surface stress and surface elasticity are *** stress function method and Fourier integral transform technique are *** solutions are provided in a compact manner that can easily reduce to special situations that take into account either one surface effect or none at *** results indicate that surface effects generally lower the stress levels and smooth the deformation profiles in the *** elasticity plays a dominant role in the in-plane elastic fields for a tangentially loaded half-plane,while the effect of residual surface stress is fundamentally crucial for the out-of-plane stress and displacement when the half-plane is normally *** the remaining situations,combined effects of surface elasticity and residual surface stress should be *** results for a concentrated surface force serve essentially as fundamental solutions of the Flamant and the half-plane Cerruti problems with surface *** solutions presented in this work may be helpful for understanding the contact behaviors between solids at the nanoscale.

关键词： Surface effects Residual surface stress Surface elasticity Half-plane Analytical solutions

Aeroengine thrust estimation and embedded verification based on improved temporal convolutional network

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Chinese Journal of Aeronautics 2024年第1期37卷 106-117页

作者： Wanzhi MENG Zhuorui pan Sixin WEN pan QIN Ximing SUN Key Laboratory of Intelligent Control and Optimization for Industrial Equipment of Ministry of Education Dalian University of TechnologyDalian 116024China School of Control Science and Engineering Dalian University of TechnologyDalian 116024China

Thrust estimation is a significant part of aeroengine thrust control *** traditional estimation methods are either low in accuracy or large in *** further improve the estimation effect,a thrust estimator based on Multi-layer Residual Temporal Convolutional Network(M-RTCN)is *** solve the problem of dead Rectified Linear Unit(ReLU),the proposed method uses the Gaussian Error Linear Unit(GELU)activation function instead of ReLU in residual *** the overall architecture of the multi-layer convolutional network is adjusted by using residual connections,so that the network thrust estimation effect and memory consumption are further ***,the comparison with seven other methods shows that the proposed method has the advantages of higher estimation accuracy and faster convergence ***,six neural network models are deployed in the embedded controller of the micro-turbojet *** Hardware-in-the-Loop(HIL)testing results demonstrate the superiority of M-RTCN in terms of estimation accuracy,memory occupation and running ***,an ignition verification is conducted to confirm the expected thrust estimation and real-time performance.

关键词： Thrust estimation Temporal convolutional network Embedded deployment Hardware-in-the-loop testing Ignition verification

New opportunities for ferroelectric deep-UV nonlinear optical crystals

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Science China Materials 2024年第3期67卷 1004-1005页

作者： Miriding Mutailipu Shilie pan Research Center for Crystal Materials Xinjiang Technical Institute of Physics and ChemistryChinese Academy of SciencesUrumqi 830011China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

Deep-ultraviolet(deep-UV)light with the wavelength below200 nm is one of the most crucial elements of both laser-driven industrial and scientific applications in recent years[1].DeepUV light has been produced using a variety of techniques,such as gas discharge lamps,synchrotron radiation,excimer lasers,free electron lasers,and nonlinear frequency conversion.

关键词： nonlinear optical ferroelectric