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轴重和频率对激光修复316L不锈钢涂层在铁路车轮踏面制动中摩擦学性能的影响

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表面工程与再制造 2024年第2期24卷 51-52页

作者： Li S. Xiao q. y.ng W. y.ng C. Wang y. State Key.Laboratory.of Performance Monitoring and Protecting of Rail Transit Infrastructure East China Jiaotong University Nanchang 330013 China School of Mechatronics and Vehicle Engineering East China Jiaotong University Nanchang 330013 China Railway.Industry.Key.Laboratory.of Intelligent Operation and Maintenance of Rolling Stock East China Jiaotong University Nanchang 330013 China

研究复杂制动环境对修复熔覆层服役性能的影响,对提高列车轮轨系统抵御极端恶劣环境的能力具有重要意义。本文针对火车车轮踏面局部损伤问题,利用激光熔覆修复技术在损伤处制备316L不锈钢涂层。采用MS-HT1000高温磨损试验机进行磨损实... 详细信息

研究复杂制动环境对修复熔覆层服役性能的影响,对提高列车轮轨系统抵御极端恶劣环境的能力具有重要意义。本文针对火车车轮踏面局部损伤问题,利用激光熔覆修复技术在损伤处制备316L不锈钢涂层。采用MS-HT1000高温磨损试验机进行磨损实验。然后,分析不同制动条件对修复试样在室温和高温下摩擦磨损性能的影响。

关键词：激光修复铁路车轮局部损伤磨损实验车轮踏面磨损试验机服役性能踏面制动

Rational design of AgGaS/ZnS/ZnS q.antum dots with a near-unity.photoluminescence q.antum y.eld via double shelling scheme

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Journal of Materials Science & Technology 2024年第2期169卷 235-242页

作者： H.X.Lu H.Liu Z.Z.Fu y.y.Chen H.q.Dai Z.Hu W.L.Zhang R.q.Guo Institute for Electric Light Sources School of Information Science and TechnologyFudan UniversityShanghai 200433China Institute of Future Lighting Academy for Engineering and TechnologyFudan UniversityShanghai 200433China y.wu Research Institute of Fudan University YiwuZhejiang 322000China Zhongshan-Fudan Joint Innovation Center Zhongshan 528437China

In this study.a two-step method was used to sy.thesize highly.luminescent AgGaS/ZnS/ZnS q.antum dots(q.s).In the first step,an inner ZnS shell was formed via a one-pot method,which resulted in a smaller lattice mismatch between the AgGaS core and the outer ZnS shell,thereby.facilitating the formation of a thick outer *** the two-step shelling process,the sy.thesized AgGaS/ZnS/ZnS q.s showed an excellent photoluminescence q.antum y.eld(PLq.0}of 96.4%with a peak wavelength of 508 nm,repre-senting the highest PLq.0}reported thus far for AgGaS ***,the effect of halogen ions in Zn precursors on the shelling process was *** was proposed that the capacity.of halogen ions to coordinate with the q.s influenced the balance between Zn cation diffusion and ZnS shelling ***,the ZnS shelling reaction was dominant when ZnCl_(2)was employ.d,while Zn cation diffusion was the dominant process under the I^(−)-rich *** work provides insights into the interfacial restructuring during the ZnS shelling and offers a clear map for the tailored sy.thesis of core/shell q.s.

关键词： AgGaS q.antum dots Photoluminescence Core/shell Alloy.d core/shell interface

Generation of polarized electron beams through self-injection in the interaction of a laser with a pre-polarized plasma

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High Power Laser Science and Engineering 2024年第3期12卷 62-68页

作者： L.R.y.n X.F.Li y.J.Gu N.cao q.Kong M.Büscher S.M.Weng M.Chen Z.M.Sheng Key.Laboratory.of Nuclear Phy.ics and Ion-beam Application(MoE) Institute of Modern PhysicsDepartment of Nuclear Science and TechnologyFudan UniversityShanghaiChina State Key.Laboratory.of High Field Laser Phy.ics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghaiChina SANKEN(Institute of Scientific and Industrial Research) Osaka UniversityOsakaJapan Sichuan Research Institute Shanghai Jiao Tong UniversityChengduChina Peter Grünberg Institut(PGI-6) Forschungszentrum JülichJülichGermany Institut für Laser-und Plasmaphy.ik Heinrich-Heine-Universität DüsseldorfDüsseldorfGermany Key.Laboratory.for Laser Plasmas(MoE) School of Physics and AstronomyShanghai Jiao Tong UniversityShanghaiChina Collaborative Innovation Center of IFSA Shanghai Jiao Tong UniversityShanghaiChina Tsung-Dao Lee Institute Shanghai Jiao Tong UniversityShanghaiChina

Polarized electron beam production via laser wakefield acceleration in pre-polarized plasma is investigated by.particlein-cell *** evolution of the electron beam polarization is studied based on the Thomas±Bargmann±Michel±Telegdi eq.ation for the transverse and longitudinal self-injection,and the depolarization process is found to be influenced by.the injection *** the case of transverse self-injection,as found ty.ically.in the bubble regime,the spin precession of the accelerated electrons is mainly.influenced by.the ***,in the case of longitudinal injection in the q.asi-1D regime(for example,*** et al.,***.110,135002(2013)),the direction of electron spin oscillates in the laser *** the electrons move around the laser axis,the net influence of the laser field is nearly.zero and the contribution of the wakefield can be ***,an ultra-short electron beam with polarization of 99%can be obtained using longitudinal self-injection.

关键词： laser wakefield acceleration longitudinal self-injection particle-in-cell simulation polarized electron beam

In situ TEM investigation of electron irradiation and aging-induced high-density.nanoprecipitates in an Mg-10Gd-3y.1Zn-0.5Zr alloy

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Journal of Magnesium and Alloy. 2024年第5期12卷 1841-1853页

作者： M.Lv H.L.Ge q.q.Jin X.H.Shao y.T.Zhou B.Zhang X.L.Ma Sheny.ng National Laboratory.for Materials Science Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Materials Science and Engineering Research Center Guangxi University of Science and TechnologyLiuzhou 545006China

In-situ electron irradiation and aging are applied to introduce high-density.precipitates in an Mg-10Gd-3y.1Zn-0.5Zr(GWZ1031K,wt.%)alloy.to improve the *** results show that the hardness of the Mg alloy.after irradiation for 10 h and aging for 9 h at 250℃ is 1.64 GPa,which is approximately.64% higher than that of the samples before being *** is mainly.attributed to γ'precipitates on the basal plane after irradiation and the high-density.nanoscale β'precipitates on the prismatic plane after aging,which should be closely.related to the irradiation-induced homogenous *** latter play. a key.role in precipitation *** result paves a way.to improve the mechanical properties of metallic materials by.tailoring the precipitation through irradiation and aging.

关键词： Mg alloy Electron beam irradiation Hardening Precipitates In-situ TEM

Microstructure evolution and shape memory.behaviors of Ni_(47)Ti_(44)Nb_(9)alloy.subjected to multistep thermomechanical loading with different prestrain levels

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Journal of Materials Science & Technology 2024年第4期171卷 80-93页

作者： y.H.Zhang H.Li Z.W.y.ng X.Liu q.F.Gu State Key.Laboratory.of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Shaanxi Key.Laboratory.of High-Performance Precision Forming Technology.and Eq.ipment Northwestern Polytechnical UniversityXi’an 710072China

Ni_(47)Ti_(44)Nb_(9)shape memory.alloy.SMA)is a promising material in the aerospace field due to its wide transformation *** application of shape memory.effect depends on multistep thermomechan-ical loading,viz.,low-temperature deformation and subseq.ent heating to ***-temperature deformation prestrain play. a pivotal role in shape memory.properties tailoring of SMA ***,microstructure evolution and deformation mechanisms of Ni_(47)Ti_(44)Nb_(9)SMA subjected to vari-ous prestrain levels are still *** this end,microstructure evolution and shape memory.behaviors of Ni_(47)Ti_(44)Nb_(9)alloy.subjected to multistep thermomechanical loading with prestrain levels of 8%-16%at-28℃(M_(s)+30℃)were *** results demonstrate that the stress-strain curve of the specimen exhibits four distinct stages at a maximal prestrain of 16%.Whereas stageⅡand stageⅢend at prestrains of∼8%and∼12%,*** stageⅡ,the stress-induced martensitic transformation is accompanied by.the dislocation slip of the NiTi matrix andβ-Nb *** stageⅢ,in addition to the higher density.of dislocations and further growth of stress-induced martensite variants(SIMVs),(001)compound twins are introduced as a result of the(001)deformation twinning in stress-induced ***{20-1}martensite twins are gradually.introduced in stageⅣ.Correspondingly.after subseq.ent unloading and heating,a higher density.of{114}austenite twins form in the specimen with a larger prestrain of 16%.With increasing prestrain from 8%to 16%,the recoverable strainε_(re)^(T)upon heating increases first and then ***ε_(re)^(T)obtains a maximum of 7.03%at 10%prestrain and de-creases to 6.17%at 16%*** increase ofε_(re)^(T)can be attributed to the formation of new SIMVs,the further growth of existing SIMVs,and the recoverable(001)compound *** the decrease ofε_(re)^(T)is mainly.associated with the irrecoverable strain by.20−1}martensite *** effe

关键词： Ni_(47)Ti_(44)Nb_(9)shape memory.alloy Wide transformation hy.teresis Thermomechanical loading Microstructure evolution Shape memory.behaviors Stress-induced martensitic transformation Deformation twinning

Rescattering of stimulated Raman side scattering in nonuniform plasmas

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Matter and Radiation at Extremes 2024年第5期9卷 68-76页

作者： S.Tan q.Wang y.Chen W.B.y.o C.Z.Xiao J.F.My.tt School of Phy.ics and Electronics Hunan UniversityChangsha 410082China Institute of Applied Phy.ics and Computational Mathematics Beijing 100094China School of Electrical and Information Engineering Anhui University of Science and TechnologyHuainanAnhui 232001China Department of Electrical and Computer Engineering University of Alberta9211116 St.NWEdmontonAlberta T6G 1H9Canada

Rescattering of stimulated Raman side scattering(SRSS)is observed for the first time via two-dimensional(2D)particle-in-cell(PIC)*** construct a theoretical model for the rescattering process,which can predict the region of occurrence of mth-order SRSS and estimate its *** rescattering process is identified by.the 2D PIC simulations under ty.ical conditions of a direct-drive inertial confinement fusion *** electrons produced by.second-order SRSS propagate nearly.perpendicular to the density.gradient and gain nearly.the same energy.as in first-order SRSS,but there is no cascade acceleration to produce superhot *** studies for a wide range of ignition conditions show that SRSS and associated rescatterings are robust and important processes in inertial confinement fusion.

关键词： nonuniform acceleration scattering

Effect of Al_(2)O_(3)on the Mechanical Properties of(B_(4)C+Al_(2)O_(3))/Al Neutron Absorbing Materials

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Acta Metallurgica Sinica(English Letters) 2024年第8期37卷 1411-1420页

作者： J.X.Cai B.M.Shi N.Li y.Liu Z.G.Zhang y.N.Zan q.Z.Wang B.L.Xiao Z.y.Ma Shi‑Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Key.Laboratory.of Nuclear Materials and Safety.Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Nuclear Eq.ipment Division Beijing Institute of Nuclear EngineeringChina Nuclear Power Engineering Co.Ltd.Beijing 100840China Department of Materials Science School of Mechanical EngineeringShenyang UniversityShenyang 110044China

B_(4)C/Al composites are widely.utilized as neutron absorbing materials for the storage and transportation of spent nuclear *** order to improve the high-temperature mechanical properties of B_(4)C/Al composites,in-situ nano-Al_(2)O_(3)was introduced utilizing oxide on Al powder *** this study.the Al_(2)O_(3)content was adjusted by.utilizing spheroid Al powder with vary.ng diameters,thereby.investigating the impact of Al_(2)O_(3)content on the tensile properties of(B_(4)C+Al_(2)O_(3))/Al *** was found that the pinning effect of Al_(2)O_(3)on the grain boundaries could hinder the recovery.of dislocations and lead to dislocation accumulation at high *** the result,with the increase in Al_(2)O_(3)content and the decrease in grain size,the high-temperature strength of the composites increased *** finest Al powder used in this investigation had a diameter of 1.4μm,whereas the resultant composite exhibited a maximum strength of 251 MPa at room temperature and 133 MPa at 350℃,surpassing that of traditional B_(4)C/Al composites.

关键词： Al matrix composites Neutron absorbing materials (B_(4)C+Al_(2)O_(3))/Al composites High-temperature strength

Interfacial stress engineering toward enhancement of ferroelectricity.in Al doped HfO_(2)thin films

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Chinese Phy.ics B 2024年第9期33卷 637-643页

作者： S X Chen M M Chen y.Liu D W cao G J Chen Department of Microelectronics Jiangsu UniversityZhenjiang 212013China Department of Phy.ics Jiangsu UniversityZhenjiang 212013China Guangdong–Hong Kong–Macao Joint Laboratory.for Intelligent Micro-Nano Optoelectronic Technology Foshan UniversityFoshan 528225China

Ferroelectric HfO_(2)has attracted much attention owing to its superior ferroelectricity.at an ultra-thin thickness and good compatibility.with Si-based complementary.metal-oxide-semiconductor(CMOS)***,the cry.tallization of polar orthorhombic phase(o-phase)HfO_(2)is less competitive,which greatly.limits the ferroelectricity.of the as-obtained ferroelectric HfO_(2)thin ***,the cry.tallization of o-phase HfO_(2)can be thermody.amically.modulated via interfacial stress *** this paper,the growth of improved ferroelectric Al doped HfO_(2)(HfO_(2):Al)thin films on(111)-oriented Si substrate has been *** analy.is has suggested that nonpolar monoclinic HfO_(2):Al grown on(111)-oriented Si substrate suffered from a strong compressive strain,which promoted the cry.tallization of(111)-oriented o-phase HfO_(2)in the as-grown HfO_(2):Al thin *** addition,the in-plane lattice of(111)-oriented Si substrate matches well with that of(111)-oriented o-phase HfO_(2),which further thermally.stabilizes the o-phase HfO_(2).Accordingly.an improved ferroelectricity.with a remnant polarization(2P_(r))of 26.7C/cm^(2) has been *** results shown in this work provide a simple way.toward the preparation of improved ferroelectric HfO_(2)thin films.

关键词： improved ferroelectricity interfacial stress engineering compressive strain HfO_(2)

Advanced Design of Soft Robots with Artificial Intelligence

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Nano-Micro Letters 2024年第10期16卷 474-521页

作者： y.ng cao Bingang Xu Bin Li Hong Fu Nanotechnology.Center School of Fashion and TextilesThe Hong Kong Polytechnic UniversityHong Kong 999077People's Republic of China Department of Mathematics and Information Technology The Education University of Hong KongHong Kong 999077People's Republic of China Bioinspired Engineering and Biomechanics Center Xi'an Jiaotong UniversityXi'an 710049People's Republic of China

In recent y.ars,breakthrough has been made in the field of artificial intelligence(AI),which has also revolutionized the industry.of *** robots featured with high-level safety.less weight,lower power consumption have alway. been one of the research ***,multifunctional sensors for perception of soft robotics have been rapidly.developed,while more algorithms and models of machine learning with high accuracy.have been optimized and *** of soft robots with AI have also been advanced ranging from multimodal sensing,human-machine interaction to effective actuation in robotic ***-less,comprehensive reviews concerning the new developments and strategies for the ingenious design of the soft robotic sy.tems eq.ipped with AI are ***,the new development is sy.tematically.reviewed in the field of soft robots with ***,background and mechanisms of soft robotic sy.tems are briefed,after which development focused on how to endow the soft robots with AI,including the aspects of feeling,thought and reaction,is ***,applications of soft robots with AI are sy.tematically.summarized and discussed together with advanced strategies proposed for performance *** thoughts for future intelligent soft robotics are pointed ***,some perspectives are put forward.

关键词： Soft robotic sy.tems Artificial intelligence Design tactics Review and perspective