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Research Progress on Controllable Absorption Properties of Rare Earth Element Doped Electromagnetic Wave Absorbing materials

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Chinese Journal of Chemistry 2024年第20期42卷 2536-2549页

作者： Yanli Deng Long Wang Wei Liu Na Wu Jiurong Liu Fei Pan Zhihui Zeng Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinanShandong 250061China Institute of Crystal Materials State Key Laboratory of Crystal MaterialsShandong UniversityJinanShandong 250100China School of Chemistry and Chemical Engineering Shandong UniversityJinanShandong 250100China Department of Chemistry University of BaselBasel CH-4058Switzerland

The utilization of rare earth(RE)elements is pivotal in wave *** particular cases,RE group elements manifesting unique 4f electron layer structures are doped as impurities into certain materials,which is a practical and reliable method for regulating these materials'magnetic and electrical ***,ferrites and metal-organic frameworks(MOFs),standing out among conventional and emerging wave-absorbing materials,can achieve significantly enhanced wave absorption through RE doping or *** scholars have dedicated massive research over a substantially long time to explore the utilization of RE elements to reinforce the absorption of these two ***,consolidating and summarizing such efforts are crucial and *** review aims to clarify the underlined mechanism of electromagnetic wave(EMW)absorption and elaborate on the impact of RE doping by providing a comprehensive overview of recent progress in ferrites and MOFs dopped with RE ***,the limitations associated with RE doping in such materials are delineated,and the upcoming prospects for its application are highlighted.

关键词： Electromagnetic wave Rare earth Absorber Sol-gel processes Defects Metal-organic frameworks

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A facile high-efficiency preparation strategy for Al-containing multi-component boride microcrystals with superior comprehensive performance

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Journal of materials Science & Technology 2025年第1期204卷 190-203页

作者： Yong Fan Jinfeng Nie Zhigang Ding Yujing Zhang Xiang Chen Wei Liu Sen Yang Sida Liu Xiangfa Liu Yonghao Zhao Nano and Heterogeneous Materials Center School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing 210094China Laboratory for multiscale mechanics and medical science SV LABSchool of AerospaceXi’an Jiaotong UniversityXi’an 710049China Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of EducationShandong UniversityJinan 250061China School of Materials Science and Engineering Hohai UniversityChangzhou 213200China

Multi-component transition group metal borides(MMB_(2))have become a research hotspot due to their new composition design concepts and superior properties compared with conventional *** of the current methods,however,are complicated and time-consuming,the mass production remains a ***,we proposed a new high-efficiency strategy for synthesis of MMB_(2)using molten aluminum as the medium for the first *** prepared Al-containing multi-component borides(TiZrHfNbTa)B_(2)microcrystals had a homogeneous composition with a hexagonal AlB_(2)structure and ultra-high hardness value of∼35.3 GPa,which was much higher than data reported in the literature and the rule of mix-ture ***,combined with the First-principles calculation results,we found that the Poisson’s ratio(v)values exhibit a clearly ascending trend from 0.17 at VEC=3.5 to 0.18 at VEC=3.4,then to 0.201 at VEC=3.2 with the increasing of Al *** indicates that the intrinsic toughness of multi-component boride microcrystals is obviously enhanced by the trace-doped Al ***,the fabricated Al-containing multi-component boride microcrystals have superior oxidation activation en-ergy and structural *** enhanced oxidation resistance is mainly attributed to the formation of a protective Al2 O3 oxide layer and the lattice distortion,both of which lead to sluggish diffusion of O_(2).These findings propose a new unexplored avenue for the fabrication of MMB_(2)materials with supe-rior comprehensive performance including ultra-hardness and intrinsically improved thermo-mechanical properties.

关键词： Multi-component borides First-principles calculations Crystal growth Mechanical properties Oxidation behavior

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A comprehensive analysis on microstructure evolution of Mg-5.65Zn-0.66Zr alloy during hot deformation

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Journal of Magnesium and Alloys 2021年第2期9卷 520-531页

作者： Qian Cheng Liang Chen Jianwei Tang Guoqun Zhao Lu Sun Cunsheng Zhang Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) Shandong UniversityJinanShandong 250061PR China

The microstructure evolution of Mg-5.65 Zn-0.66 Zr(wt.%)alloy was studied based on the hot compression *** results indicated that the flow stress increased rapidly to a peak point at the initial stage,and then it gradually ***,high temperature and low strain rate resulted in the decreasing of flow *** samples exhibited a necklace grain structure because of the occurrence of partial dynamic recrystallization(DRX).High temperature increased both the size and fraction of DRXed grains,while high strain rate showed an opposite *** the conditions of 350°C/0.001 s^(-1)and 350°C/0.1 s^(-1),the twins were not exhibited and DRX played a dominant ***,the obvious split of basal texture was *** pyramidalslip with high value of Schmid factor was active in large deformed grains,which corresponded to the peak split point in(0001)pole figure.A mechanism about the grain rotation was proposed to explain the relationship between the pyramidal slip and the split of basal ***,it was found that large number of{10–12}extension twins were formed during the initial stage at condition of 300°C/1 s^(-1),and the number of twins decreased with the increase of *** twins greatly contributed to the fast formation of basal texture and grain ***,the non-basal slips were active in twining region,which could facilitate the nucleation of DRX.

关键词： Hot compression Microstructure Recrystallization Texture Twinning

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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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Unveiling the time-temperature dependence of metastability of supercooled liquid using nano-calorimetry

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Science China(Physics,Mechanics & Astronomy) 2024年第3期67卷 119-127页

作者： Yijun Ding Lijian Song Zheng Wang Ruiqi Yu Junqiang Wang Lina Hu Yuanzheng Yue Edgar D.Zanotto Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) Shandong University Jinan 250061China Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201China Key Laboratory of Experimental Teratology Shandong University Jinan 250061 China Department of Chemistry and Bioscience Aalborg UniversityAalborg 9220Denmark Department of Materials Engineering Federal University of Sao CarlosSao Carlos SP 13.565-905Brazil

There is a lack of understanding of both the conversion of an unstable glass into a metastable supercooled liquid(MSL) upon heating and the metastability of MSLs. In this study, we investigated the time-and temperature-dependent metastability of an MSL using an advanced nano-calorimetric technique. The chosen Au-based metallic glass(Au MG) allowed adequate probing of its MSL in a temperature range between 10 and 70 K above the standard glass transition temperature. We found that the survival time of the MSL state is a quadratic function of temperature. Beyond this duration threshold, the sample undergoes fast crystallization even if it is below the crystallization temperature that is measured using differential scanning *** transmission electron microscopy, we observed the formation of clusters with a partially ordered lattice structure during relaxation in the Au MG sample fabricated using a nano-calorimeter. The atomic ordering within the clusters was enhanced by increasing time and temperature in the MSL region. Once the as-produced glass entered the MSL stage upon heating followed by a quenching stage at a given rate, the mechanical properties of the quenched glass remained the same regardless of its holding temperature and duration within the MSL region. This work provides insights into the glass-MSL-crystal transformation and offers guidance for designing standard metallic glasses for property characterizations.

关键词： metallic glass supercooled liquid relaxation nucleation nano calorimetric technology

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Three-Dimensional Reconstruction of Welding Pool Surface by Binocular Vision

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Chinese Journal of Mechanical Engineering 2021年第3期34卷 272-284页

作者： Zunan Gu Ji Chen Chuansong Wu Key Laboratory for Liquid-Solid Structural Evolution&Processing of Materials Ministry of EducationInstitute of Materials JoiningShandong UniversityJinan 250061China

Current research of binocular vision systems mainly need to resolve the camera’s intrinsic parameters before the reconstruction of three-dimensional(3D)*** classical Zhang’calibration is hardly to calculate all errors caused by perspective distortion and lens ***,the image-matching algorithm of the binocular vision system still needs to be improved to accelerate the reconstruction speed of welding pool *** this paper,a preset coordinate system was utilized for camera calibration instead of Zhang’*** binocular vision system was modified to capture images of welding pool surfaces by suppressing the strong arc interference during gas metal arc *** and improving the algorithms of speeded up robust features,binary robust invariant scalable keypoints,and KAZE,the feature information of points(i.e.,RGB values,pixel coordinates)was extracted as the feature vector of the welding pool *** on the characteristics of the welding images,a mismatch-elimination algorithm was developed to increase the accuracy of image-matching *** world coordinates of matching feature points were calculated to reconstruct the 3D shape of the welding pool *** effectiveness and accuracy of the reconstruction of welding pool surfaces were verified by experimental *** research proposes the development of binocular vision algorithms that can reconstruct the surface of welding pools accurately to realize intelligent welding control systems in the future.

关键词： Surface reconstruction Welding pool Binocular imaging Gas metal arc welding Feature points matching

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An overview of metal hydroxyfluoride-A novel semiconductor material

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ChemPhysMater 2024年第2期3卷 125-142页

作者： Xingyu Yao Rutao Wang Jinbo Zhao Fei Liu Zhidong Jin Zhou Wang Fenglong Wang Jiurong Liu Lili Wu Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of EducationSchool of Materials Science and EngineeringShandong UniversityJinan250061China School of Materials Science and Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China

Semiconductors have been widely used in many high-tech fields such as photo-and electro-catalysis,ion bat-teries,and solar *** addition to the earliest discovered elemental and compound semiconductors,such as monocrystalline silicon and metal oxides,new types of compound semiconductors have been *** them,metal hydroxyfluorides(MOHF)are an emerging type of semiconductor that are easy to synthesize and ***,many of their properties and applications are not well ***,some MOHF materials,such as ZnOHF and CoOHF,have been sufficiently developed,and their applications have been extensively *** review focuses on a new compound semiconductor,MOHF,with ZnOHF and CoOHF as the *** a short introduction to their physical and chemical properties,their common applications are illustrated with several ***,other less-researched MOHF and MOHF-like materials,as well as their applications,are ***,the expectations and development directions of MOHFs are briefly summarized.

关键词： Metal hydroxyfluoride Semiconductor Functionalmaterials Photocatalysts Electrochemistry

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Progress and perspectives on two-dimensional silicon anodes for lithium-ion batteries

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ChemPhysMater 2023年第1期2卷 1-19页

作者： Han Zhao Fan Yang Chongxing Li Tong Li Shuxian Zhang Chengxiang Wang Zhiwei Zhang Rutao Wang Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of EducationSchool of Materials Science and EngineeringShandong UniversityJinan 250061China Suzhou Institute of Shandong University Suzhou 215123China

Silicon(Si)anodes with extremely high theoretical capacities are considered indispensable for next-generation high-energy lithium-ion batteries(LIBs).However,several intractable problems,including pulverization,poor electrical contact,and continuous side reactions caused by the large volume change of Si during lithia-tion/delithiation,lead to a short cycle life and poor rate capability,thus hindering the commercial use of Si anodes in ***-dimensional(2D)Si with a unique graphene-like structure has a short ion diffusion path-way,small volume change during lithiation,and efficient redox site utilization,making it more promising than bulk Si or Si with other versatile structures for use in *** analysis demonstrated that the low energy barrier on the surface of 2D Si accelerates the transport of Li+.However,the issues surrounding 2D Si,includ-ing the tedious and user-unfriendly synthesis,ease of restacking,and atmospheric sensitivity,limit its practical applications,which are discussed in this ***,possible solutions to these remaining challenges and new directions are provided,with the aim of designing practical and high-performance 2D Si anodes for next-generation LIBs.

关键词： Lithium-ion batteries Two-dimensional materials Silicon Anodes Alloy-type materials

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Brittleness and fracture mechanism of sintered Dy-doped NdFeB magnets

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Rare Metals 2022年第8期41卷 2688-2692页

作者： Li-Na Zhao Xiao-Li Wang Kai-Hong Ding Sheng-Li Cui Yong-Cong Sun Mu-Sen Li Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of EducationJinan UniversityJinan250061China Institute of Materials Jiangsu University of Science and TechnologyZhenjiang212003China Yantai Shougang Magnetic Materials Inc Yantai265500China

The brittleness and fracture behaviors of the sintered and the two-stage aged Dy-doped NdFeB magnets were studied by a unique method of acoustic emission testing and Vickers hardness indentation method in this paper.A detailed analysis on the crack propagation mechanism along the grain boundary of the main grain phase(Nd,Dy)_(2)Fe_(14)B was *** comparing the acoustic emission energy count value(E_(n))with the Vickers hardness indentation load(P),it is shown that there is a linear relationship between En and P for both the sintered and the two-stage aged Dy-doped NdFeB *** to the slope of En versus P linear lines,it can be found that the two-stage aged Dy-doped NdFeB magnet is more brittle than the sintered *** is due to that the Ndrich grain boundary phase of the two-stage aged Dy-doped NdFeB magnet is formed as thin film and uniformly distributes around the main grain phase,which plays a significant role in increasing the intrinsic coercive force of the magnet,but decreasing its interface binding ***,the resistance of crack propagation along the grain boundary decreases and the brittleness increases.

关键词： Dy-doped NdFeB magnet Brittleness testing Fracture analysis Acoustic emission testing Vickers hardness indentation

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The influence of the welding thermal cycles on the distribution of alloying elements in the HAZ structure of duplex steel 220 7th

The influence of the welding thermal cycles on the distribut...

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7th International Conference on Welding and Related Technologies, WRT 2024

作者： Maksymov, S. Yu. Fadeeva, G.V. Jia, Chuanbao Vasiliev, D.V. Radzievska, A.A. E.O. Paton Electric Welding Institute National Academy of Sciences of Ukraine Kyiv Ukraine Key Laboratory of Liquid-Solid Structural Evolution and Processing of Materials of Ministry of Education Institute of Materials Joining Shandong University Jinan China

ISBN: (纸本)9781032851761

The article presents the results of determining the distribution of alloying elements in δ-ferrite and austenite in the microstructure of the HAZ simulated using the Gleeble-3800 device for welding thermal cycles that are inherent in wet underwater welding and air welding. It is shown that with an increase in the cooling rate, the difference in the redistribution of the elements Mo and Cr, as well as N and Ni between the ferrite and austenite phases decreases. The highest content of these alloying elements is observed at the boundary of the δ/γ phases. © 2025 The Author(s).

关键词： Underwater welding

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