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Journal of Materials Science & Technology 2024年第5期172卷 166-184页

作者： Tianxu Zheng yaobo hu Chao Zhang Tianshuo Zhao Bin Jiang Fusheng Pan Aitao Tang College of Materials Science and Engineering Chongqing UniversityChongqing400044China National Engineering Research Center for Magnesium Alloys Chongqing400044China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai200240China

The aim of this research was to elucidate the underlying mechanism involved in the formation of rare earth(RE)texture and pseudo fiber bimodal microstructure in the high ductility Mg-2Gd-0.4Zr *** microstructure and texture evolution during the extrusion process were analyzed using various tech-niques,including optical microscopy(OM),scanning electron microscopy(SEM),electron backscatter diffraction(EBSD),and electron probe microanalysis(EPMA).The findings revealed that the RE texture in the extruded Mg-2Gd-0.4Zr alloy emerged during the dynamic recrystallization(DRX)process and was further strengthened during the subsequent static recrystallization and grain growth *** nu-cleation and growth of grains in the streamline region of Zr particles were delayed in comparison to other regions due to the pinning effect of Zr particles,ultimately resulting in the formation of pseudofiber bi-modal microstructure in the extruded Mg-2Gd-0.4Zr alloy.

关键词： Magnesium alloys Ductility Rare earth texture Bimodal microstructure

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激光制导武器的作战使用综述

兵器装备工程学报 2024年第8期45卷 309-316页

作者：胡飞郭宇胡尧博王硕彭思洋伍友利空军工程大学航空工程学院西安710038 安徽工业大学安徽马鞍山243032

激光制导技术由于其高精度、强抗干扰能力而被广泛应用到武器制导系统中。介绍了激光制导原理、激光制导武器的分类、发展历程、激光制导武器的作战使用情况,分析了影响武器投放精度的干扰因素,为激光制导武器后续的发展和战场使用研究... 详细信息

激光制导技术由于其高精度、强抗干扰能力而被广泛应用到武器制导系统中。介绍了激光制导原理、激光制导武器的分类、发展历程、激光制导武器的作战使用情况,分析了影响武器投放精度的干扰因素,为激光制导武器后续的发展和战场使用研究提供借鉴。

关键词：激光制导发展综述作战使用激光干扰

Low-temperatures synthesis of CuS nanospheres as cathode material for magnesium second batteries

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Journal of Magnesium and Alloys 2023年第1期11卷 192-200页

作者： Qin Zhang yaobo hu Jun Wang Fusheng Pan College of Materials Science and Engineering Chongqing UniversityChongqing 400044China National Engineering Research Center for Magnesium Alloys Chongqing 400044China

Rechargeable magnesium batteries(RMBs),as one of the most promising candidates for efficient energy storage devices with high energy,power density and high safety,have attracted increasing ***,searching for suitable cathode materials with fast diffusion kinetics and exploring their magnesium storage mechanisms remains a great *** S submicron spheres,made by a facile low-temperature synthesis strategy,were applied as the high-performance cathode for RMBs in this work,which can deliver a high specific capacity of 396mAh g^(-1)at 20 mA g^(-1) and a remarkable rate capacity of 250 m Ah g^(-1)at 1000 mA g^(-1).The excellent rate performance can be assigned to the nano needle-like particles on the surface of Cu S submicron spheres,which can facilitate the diffusion kinetics of Mg^(2+).Further storage mechanism investigations illustrate that the Cu S cathodes experience a two-step conversion reaction controlled by diffusion during the electrochemical reaction *** work could make a contribution to the study of the enhancement of diffusion kinetics of Mg2+and the reaction mechanism of RMBs.

关键词： Magnesium second batteries Cathode material CuS Submicron spheres Low-temperature synthesis.

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相变材料在冬季沥青路面中的应用分析

交通节能与环保 2024年第3期20卷 148-152页

作者：李阳胡耀波肖洪清葛洲坝集团交通投资有限公司湖北武汉430200

沥青路面在冬季低温雨雪气候下易发生结霜、结冰现象,致使路面抗滑性能降低,从而导致事故发生率上升,给行车安全及路面使用性能带来严重影响。传统的被动式除雪法效率低,且须占用行车道影响道路正常运行,化学融雪剂还会造成土壤和水污... 详细信息

沥青路面在冬季低温雨雪气候下易发生结霜、结冰现象,致使路面抗滑性能降低,从而导致事故发生率上升,给行车安全及路面使用性能带来严重影响。传统的被动式除雪法效率低,且须占用行车道影响道路正常运行,化学融雪剂还会造成土壤和水污染。本文通过文献调研,总结常见的主动融雪化冰路面类型,分析相变材料在沥青路面中的应用研究重点,提出将相变材料掺入沥青路面中,以预防或减少冬季沥青路面冰冻病害。

关键词：道路工程相变材料主动调温沥青路面融雪抗冰

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Influence of extrusion conditions on microstructure and mechanical properties of Mg-2Gd-0.3Zr magnesium alloy

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Journal of Magnesium and Alloys 2022年第2期10卷 420-433页

作者： Tianshuo Zhao yaobo hu Chao Zhang Bing He Tianxu Zheng Aitao Tang Fusheng Pan College of Materials Science and Engineering Chongqing UniversityChongqing 400044China National Engineering Research Center for Magnesium Alloys Chongqing 400044China

In general,different extrusion conditions will affect the microstructure of magnesium alloys and further determine the mechanical *** effects of extrusion parameters and heat treatment processes such as extrusion speed,pre-forging,annealing time,extrusion ratio and cooling rate on the microstructure,texture evolution and tensile properties of Mg-2Gd-0.3Zr alloys were investigated in this *** with the as-cast alloy,the extrusion process significantly refines the grains and exhibit the rare earth *** the increase of extrusion speed and annealing time,the growth of recrystallized grains is accelerated,leading to the increase of *** pre-forging deformation achieves to refine the grains by promoting recrystallization nucleation,resulting in increased strength of Mg-2Gd-0.3Zr *** the extrusion ratio or increasing the cooling rate will introduce coarse un-DRXed grains,which transformed the texture into the basal *** particular,the effect of rapid cooling on refining the recrystallized grains is also *** extrusion conditions influence the mechanical properties of the Mg-2Gd-0.3Zr alloy through the grain size,proportion of non-recrystallization region and texture type.

关键词： Mg-2Gd-0.3Zr alloy Extrusion conditions Microstructure Texture Mechanical properties

Annealing hardening effect aroused by solute segregation in gradient ultrafine-grained Mg-Gd-Zr alloy

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Journal of Materials Science & Technology 2023年第13期144卷 70-80页

作者： Chunquan Liu Xianhua Chen Domonkos Tolnai yaobo hu Wei Zhang Yusheng Zhang Fusheng Pan College of Materials Science and Engineering Chongqing UniversityChongqing 400045China National Engineering Research Centre for Magnesium Alloys Chongqing UniversityChongqing 400045China Institute of Metallic Biomaterials Helmholtz-Zentrum HereonMax-Planck Street 1Geesthacht 21502Germany Northwest Institute for Nonferrous Metal Research Xi’an 710016China

In this study,a remarkable annealing hardening effect was detected in gradient ultrafine-grained(UFG)Mg-0.32Gd-0.11Zr(at.%)alloy sheet fabricated by sliding friction treatment(SFT).Under the precipitation-free condition,the annealed UFG structure shows an obvious hardness increment from 1.40 GPa to 1.89 GPa after 200℃ heating for 12 h,which exhibits a much higher hardening response than the annealed coarse-grained(CG)*** high-angle annular dark-field scanning transmission elec-tron microscopy(HAADF-STEM)and elemental mapping reveal prominent segregation of solute Gd atoms along grain boundaries,which endows the UFG structure with excellent grain boundary ***-over,Gd segregation is also found around the extrinsic stacking fault(E-SFs)and the low-angle grain boundaries composed of edge *** large-scale solute partitioning provides a significant seg-regation hardening effect,which completely resists the softening effect aroused by the grain coarsening and dislocation *** work realizes a good combination of surface mechanical processing for fabricating UFGs and subsequent heat treatment,which earns desirable segregation hardening effects.

关键词： Ultrafine grains Segregation Annealing hardening

Improved Corrosion Resistance of Ultrafine-Grained Mg-Gd-Zr Alloy Fabricated by Surface Friction Treatment

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金属学报:英文版 2023年第8期36卷 1281-1291页

作者： Chunquan Liu Xianhua Chen Yulong Wu yaobo hu Wei Zhang Yusheng Zhang Jingying Bai Fusheng Pan International Joint Laboratory for Light Alloys(MOE) College of Materials Science and EngineeringChongqing UniversityChongqing400045China National Engineering Research Centre for Magnesium Alloys Chongqing UniversityChongqing400045China Institute of Surface Science Helmholtz-Zentrum HereonMax-Planck Street 121502GeesthachtGermany Northwest Institute for Nonferrous Metal Research Xi’an710016China Beijing Spacecraft China Academy of Space TechnologyBeijing100194China

Gradient ultrafine-grained (UFG) Mg-2Gd-0.4Zr (wt%) alloy sheet, with a UFG layer of about 118 nm on the topmost treated surface, was fabricated by sliding friction treatment (SFT). The corrosion resistance of the SFT-processed UFG surface layer was greatly improved compared to the original coarse-grained (CG) structure, representing as a higher impedance and a lower corrosion rate (CG: 4.11 mm y^(−1), UFG: 2.71 mm y^(−1)). The UFG layer with high density of grain boundaries exhibits an excellent impeditive effect on the cracking of corrosion product films. Compared to the CG sample, the stable corrosion product film inhibits the formation of pitting so providing a better protective effect. In addition, the Gd-rich clusters are randomly distributed after SFT processing, which decreases the tendency of galvanic corrosion on the UFG surface.

关键词： Ultrafine grains Mg-Gd-Zr alloy Corrosion resistance

Effect of grain size on the electrochemical behavior of pure magnesium anode

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Journal of Magnesium and Alloys 2017年第4期5卷 404-411页

作者： Tianxu Zheng yaobo hu Shengwei Yang College of Materials Science and Engineering Chongqing UniversityChongqing 400044China National Engineering Research Center for Magnesium Alloys Chongqing 400044China

Three kinds of pure magnesium anode materials with different grain sizes were prepared by extrusion at different *** grain size of each sample was calculated,then the effect of grain size on the electrochemical properties of pure magnesium anode was investigated by chemical immersion hydrogen test,potentiodynamic polarization scanning,constant current discharge and electrochemical impedance *** the extrusion temperature increases from 180℃ to 250℃,the average grain size of pure magnesium increases from 20m to 30m,and the pure magnesium extruded at 250℃ has the best electrochemical performance as magnesium anode,with the discharge potential of−1.571 V(***).Plastic deformation process is a convenient method that can change the microstructure and improve the electrochemical behavior of magnesium anode.

关键词： Pure magnesium Anode Electrochemical behavior

Anisotropic magnetism and band evolution induced by ferromagnetic phase transition in titanium-based kagome ferromagnet SmTi_3Bi_4

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Science China(Physics,Mechanics & Astronomy) 2024年第6期67卷 137-145页

作者： Zhe Zheng Long Chen Xuecong Ji Ying Zhou Gexing Qu Mingzhe hu yaobo huang Hongming Weng Tian Qian Gang Wang Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China School of Physics and Engineering Henan University of Science and TechnologyLuoyang 471023China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201210China Songshan Lake Materials Laboratory Dongguan 523808China CAS Center for Excellence in Topological Quantum Computation Chinese Academy of SciencesBeijing 100190China

Kagome magnets with diverse topological quantum responses are crucial for next-generation topological *** anisotropic magnetism and band evolution induced by ferromagnetic phase transition(FMPT)is reported in a newly discovered titanium-based kagome ferromagnet Sm Ti3Bi4,which features a distorted Ti kagome lattice and Sm atomic zig-zag ***-dependent resistivity,heat capacity,and magnetic susceptibility reveal a ferromagnetic ordering temperature Tc of23.2 K.A large magnetic anisotropy,observed by applying the magnetic field along three crystallographic axes,identifies the b axis as the easy ***-resolved photoemission spectroscopy with first-principles calculations unveils the characteristic kagome motif,including the Dirac point at the Fermi level and multiple van Hove ***,a band splitting and gap closing attributed to FMPT is observed,originating from the exchange coupling between Sm 4 f local moments and itinerant electrons of the kagome Ti atoms,as well as the time-reversal symmetry breaking induced by the long-range ferromagnetic *** the large in-plane magnetization and the evolution of electronic structure under the influence of ferromagnetic ordering,such materials promise to be a new platform for exploring the intricate electronic properties and magnetic phases based on the kagome lattice.

关键词： kagome lattice anisotropic magnetism band splitting ferromagnetic phase transition ARPES

Fabrication of corrosion-resistant superhydrophobic coating on magnesium alloy by one-step electrodeposition method

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Journal of Magnesium and Alloys 2019年第2期7卷 193-202页

作者： Tianxu Zheng yaobo hu Fusheng Pan Yuxin Zhang Aitao Tang College of Materials Science and Engineering Chongqing UniversityChongqing 400044China National Engineering Research Center for Magnesium Alloys Chongqing 400044China

A one-step electrodeposition method was used to construct a superhydrophobic coating on the surface of magnesium *** magne-sium nitrate and ethanol solution of stearic acid as electrolyte,four groups of electrolytes with different ratios of stearic acid and magnesium nitrate were designed to explore the influence of electrolyte to the *** contact angles of the four coating samples were 136.4±5.8°,152.7±2.8°,156.2±4.9°and 155.1±4.4°The addition of magnesium nitrate in the solution increased the hydrogen evolution reaction in the electrodeposition process,which was not conducive to electrodeposition *** the deposition process,the sample prepared in a molar ratio of stearic acid to magnesium nitrate of 10:1 had the best corrosion resistance,and its corrosion circuit density was 3.74×10^(−8)A/cm^(2),far lower than the corrosion current density of the magnesium alloy substrate.

关键词： Magnesium alloy Superhydrophobicity Corrosion resistance.