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Mechanical and fatigue properties of SA508-Ⅳ steel used for nuclear reactor pressure vessels

Journal of Iron and Steel Research International 2022年第8期29卷 1312-1321页

作者： Xin Dai Yue-feng Chen Peng Wang Li Zhang Bin Yang Lian-sheng Chen Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China State Key Laboratory for advanced Metals and materials University of Science and Technology BeijingBeijing 100083China college of Metallurgy and energy North China University of Science and TechnologyTangshan 063210HebeiChina

The mechanical and fatigue properties of SA508-Ⅳ steel with martensite and granular bainite, respectively, were studied. The mechanical tests results showed that the ultimate tensile strength and impact toughness of the specimen with martensite were 830 MPa and 158 J, respectively, and those of the specimen with granular bainite were 811 MPa and 115 J, respectively. The former had higher tensile strength and impact toughness than the latter. The impact tests results showed that the former belonged to typical dimple fracture, while the latter belonged to brittle fracture. The fatigue tests results showed that the fatigue life of the specimen with martensite was 2717 cycles, and that of the specimen with granular bainite was 1545 cycles under the strain amplitude of ± 0.45%. The specimen with martensite had fewer crack initiation points, narrower fatigue striations separation, and larger volume fraction of high-angle grain boundaries than the latter. The fewer crack initiation points meant fewer fatigue cracks, the narrower fatigue striations separation meant slower crack propagation rate, and the larger volume fraction of high-angle grain boundaries could more effectively hinder fatigue crack propagation. Based on these facts, the fatigue life of the specimen with martensite was higher than that of the specimen with granular bainite.

关键词： Nuclear reactor pressure vessel SA508-Ⅳsteel Low cycle fatigue Crack initiation Crack propagation

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Enhanced electrochemical performance of Si/C electrode through surface modification using SrF_(2) particle

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International Journal of Minerals,Metallurgy and materials 2021年第10期28卷 1621-1628页

作者： Jun Yang Yuan-hua Lin Bing-shu Guo Ming-shan Wang Jun-chen Chen Zhi-yuan Ma Yun Huang Xing Li School of New energy and materials Southwest Petroleum UniversityChengdu 610500China

The silicon-based material exhibits a high theoretical specific capacity and is one of the best anode for the next generation of advanced lithium-ion batteries(LIBs).However,it is difficult for the silicon-based anode to form a stable solid-state interphase(SEI)during Li alloy/de-alloy process due to the large volume change(up to 300%)between silicon and Li4.4Si,which seriously limits the cycle life of the ***,we use strontium fluoride(SrF_(2))particle to coat the silicon-carbon(Si/C)electrode(SrF_(2)@Si/C)to help forming a stable and high mechanical strength SEI by spontaneously embedding the SrF_(2) particle into *** the formed SEI can inhibit the volume expansion of the silicon-carbon anode during the *** electrochemical test results show that the cycle performance and the ionic conductivity of the SrF_(2)@Si/C anode has been significantly *** X-ray photoelectron spectroscopy(XPS)analysis reveals that there are fewer electrolyte decomposition products formed on the surface of the SrF_(2)@Si/C *** study provides a facile approach to overcome the problems of Si/C electrode during the electrochemical cycling,which will be beneficial to the industrial application of silicon-based anode materials.

关键词： silicon-based anode volume expansion strontium fluoride solid electrolyte interface cycling stability

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Effect of Y content and equal channel angular pressing on the microstructure, texture and mechanical property of extruded Mg-Y alloys

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Journal of Magnesium and Alloys 2022年第1期10卷 210-224页

作者： W.Yang G.F.Quan B.Ji Y.F.Wan H.Zhou J.Zheng D.D.Yin Key Laboratory of advanced Technologies of materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengduSichuan 610031China Nano and Heterogeneous materials Center School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China International Joint Laboratory for Light Alloys(Ministry of Education) College of Materials Science and EngineeringShenyang National Laboratory for Materials ScienceChongqing UniversityChongqing 400044China

The microstructure, texture and mechanical property evolution of the extruded Mg-x Y(x = 1, 5 wt.%) alloys during equal channel angular pressing(ECAP) were systematically investigated using an optical microscope, electron backscatter diffraction(EBSD) and uniaxial tensile test. The Mg-Y alloys exhibited a weakened basal texture before the ECAP, and the texture was further weakened with the max basal poles dispersed along ~45° between the extrusion direction and the transverse direction after the ECAP. The Mg-5 Y alloys always exhibited a finer grain size comparing to that of Mg-1 Y for the same ECAP process. With a proper ECAP process, both the strength and elongation of Mg-5 Y alloy could be improved simultaneously after the ECAP, i.e., the yield strength(273.9 ± 1.2 MPa), ultimate strength(306.4 ± 3.0 MPa),and elongation(23.9 ± 1.0%) were increased by 10%, 6%, and 72%, respectively, comparing to that before the ECAP. This was considered to be arose from the combined effects of grain refinement, significant improved microstructure homogeneity and solid solution *** addition, it was found that Mg-Y alloy with better comprehensive properties could be obtained by the decreasing-temperature ECAP processes. The yield strength-grain size relationship could be well described by the Hall-Petch relation for all the ECAPed Mg-Y alloys,which was consistent with that the texture changes did not significantly affect the average Schmid factors of basal, prismatic and pyramidal slips for both Mg-Y alloys.

关键词： Mg-RE alloy Equal channel angular pressing Texture Mechanical property

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Electronic tattoos based on large-area Mo2C grown by chemical vapor deposition for electrophysiology

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Nano Research 2023年第3期16卷 4100-4106页

作者： Shiyu Wang Xin Wang Weifeng Zhang Xiaohu Shi Dekui Song Yan Zhang Yan Zhao Zihan Zhao Nan Liu Beijing Graphene Institute Beijing 100094China Beijing Key Laboratory of energy Conversion and Storage materials College of ChemistryBeijing Normal UniversityBeijing 100875China

Tattoo electronics has attracted intensive interest in recent years due to its comfortable wearing and imperceivable sensing,and has been broadly applied in wearable healthcare and human-machine ***,the tattoo electrodes are mostly composed of metal films and conductive ***-dimensional(2D)materials,which are superior in conductivity and stability,are barely studied for electronic ***,we reported a novel electronic tattoo based on large-area Mo_(2)C film grown by chemical vapor deposition(CVD),and applied it to accurately and imperceivably acquire on-body electrophysiological signals and interface with ***-quality Mo_(2)C film was obtained via optimizing the distribution of gas flow during CVD *** to the finite element simulation(FES),bottom surface of Cu foil covers more stable gas flow than the top surface,thus leading to more uniform Mo_(2)C *** resulting Mo_(2)C film was transferred onto tattoo paper,showing a total thickness of~3μm,sheet resistance of 60-150Ω/sq,and skin-electrode impedance of~5×10^(5)Ω.Such thin Mo_(2)C electronic tattoo(MCET in short)can form conformal contact with skin and accurately record electrophysiological signals,including electromyography(EMG),electrocardiogram(ECG),and electrooculogram(EOG).These body signals collected by MCET can not only reflect the health status but also be transformed to control the robotics for human-machine interface.

关键词： electronic tattoo Mo2C film gas flow chemical vapor deposition electrophysiological signals

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Fe/Co-based nanoparticles encapsulated in heteroatom-doped carbon electrocatalysts for oxygen reduction reaction

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Science China materials 2019年第11期62卷 1626-1641页

作者： Baoxia Ni Luming Wu Rui Chen Chengxiang Shi Tiehong Chen Institute of New Catalytic materials Science School of Materials Science and Engineering Key Laboratory of Advanced Energy Materials Chemistry (MOE) Nankai University

It is crucial to develop low-cost and highly efficient catalysts for oxygen reduction reaction(ORR)which is the key process in electrochemical energy conversion and storage *** metal-based nanoparticles/carbon materials are an important class of non-noble metal catalysts that have attracted considerable research *** topic of this review is mainly focused on carbon encapsulated Fe/Cobased nanoparticles catalysts for ORR,and these catalysts are summarized in categories of metals,oxides,carbides,phosphides,sulfides and hybrid *** structures and morphologies of the carbon matrix as well as compositions of nanoparticles have great influence on the catalytic *** catalysts display excellent ORR activity and stability in alkaline media but only a few are efficient in acidic *** addition,challenges and further strategies on the development of this type of carbon encapsulated nanoparticles catalysts are also proposed.

关键词： Fe/Co based nanoparticles encapsulation carbon oxygen reduction reaction

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Pr doped single-crystal LiNi_(0.5)Mn_(0.3)Co_(0.2)O_(2)cathode enables high rate capability and cycle stability for lithium ion batteries

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Journal of Materiomics 2023年第1期9卷 82-89页

作者： Xiaopei Zhu Han Yu Lina Cheng Feifei Xu Zilu Wang Li-Zhen Fan Key Laboratory of New energy materials and Technologies Institute of Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing100083China Tianjin Guoan Mengguli New materials Science&Technology Limit Corporation Tianjin301811China Beijing Mengguli New materials Science&Technology Co. LtdBeijing102200China

The massive application of single crystal(SC)ternary cathode material LiNi_(1-x-y)Mn_(x)Co_(y)O_(2)is largely restricted by the unsatisfactory rate capability which is caused by the sluggish Li+diffusion and structural ***,Pr^(3+),a large radius ion is introduced to single-crystal LiNi_(0.5)Mn_(0.3)Co_(0.2)O_(2)to enhance Li^(+)conductivity and structural *** 0.4%Pr doping,the Li(Ni_(0.5)Mn_(0.3)Co_(0.2))_(0.996)Pr_(0.004)O_(2)cathode displays a capacity retention of 79.72%at 10 C,and a 98.17%capacity retention after 50 cycles at 25°C and 96.3%capacity retention after 50 cycles at 55°C within a 3.0–4.5 V voltage *** impedance spectroscopy confirms that the Pr doping can effectively lower the charge-transfer resistance and facilitate the transportation of Li^(+)on the surface of LiNi_(0.5)Mn_(0.3)Co_(0.2)O_(2).The Direct current internal resistance result implies that the structure of the Pr-doped cathode particles is more stable during *** addition,differential scanning calorimetry measurements measurement combined with in situ X-ray diffraction confirms the thermo-stabilization effect of the Pr dopant.

关键词： Single-crystal cathode material Pr doping Rate capability Safety Lithium-ion battery

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Preparation, morphology and luminescence properties of Gd_2O_2S:Tb with different Gd_2O_3 raw materials

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Rare Metals 2019年第3期38卷 221-226页

作者： Yu-Jie Ding Peng-De Han Li-Xi Wang Qi-Tu Zhang college of materials Science and Engineering Nanjing Tech University School of materials Engineering Yancheng Institute of Technology

The sulfide fusion method was used to synthesize Gd_2 O_2 S:Tb phosphors using commercial Gd_2 O_3 and freshly prepared Gd_2 O_3, respectively. The freshly prepared Gd_2 O_3 was synthesized from Gd_2 O(GO_3)_2·H_2 O precursor prepared by homogeneous precipitation *** structure and morphology of the composites were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM) and energy dispersive spectroscopy(EDS). The result shows that the Gd_2 O_2 S:Tb phosphor prepared by commercial Gd2 O3(GOST-A) presents agglomerated particles with average particle size of2.1 μm; however, Gd_2 O_2 S:Tb produced from as-prepared Gd_2 O_3(GOST-B) tends to form regular hexagon particles with the average particle size of 1 μm. Furthermore, Gd3+and Tb3+ contents in GOST-B are higher than that in GOST-A. In addition, fluorescent properties were analyzed by fluorescent spectrophotometer. It is indicated that similar excitation and emission spectra can be obtained from the two phosphors, but the luminescence intensity of GOST-B is higher than that of GOST-A.

关键词： Precursor Phosphor Luminescence Homogeneous precipitation Sulfide fusion

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Recent progress in the development of dielectric elastomer materials and their multilayer actuators

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第3期25卷 183-205页

作者： Shengchao JIANG Junbo PENG Lvting WANG Hanzhi MA Ye SHI ZJU-UIUC Institute Zhejiang UniversityJiaxing 314400China college of Mechanical Engineering Zhejiang UniversityHangzhou 310058China Department of Polymer Science and Engineering Zhejiang UniversityHangzhou 310058China

Dielectric elastomers(DEs)have emerged as one of the most promising artificial muscle technologies,due to their exceptional properties such as large actuation strain,fast response,high energy density,and flexible processibility for various *** the past two decades,researchers have been working on developing DE materials with improved properties and exploring innovative applications of dielectric elastomer actuators(DEAs).This review article focuses on two main topics:recent material innovation of DEs and development of multilayer stacking processes for DEAs,which are important to promoting commercialization of *** begins by explaining the working principle of a ***,recently developed strategies for preparing new DE materials are introduced,including reducing mechanical stiffness,increasing dielectric permittivity,suppressing viscoelasticity loss,and mitigating electromechanical instability without *** the next section,different multilayer stacking methods for fabricating multilayer DEAs are discussed,including conventional dry stacking,wet stacking,a novel dry stacking method,and micro-fabrication-enabled stacking *** review provides a comprehensive and up-to-date overview of recent developments in high-performance DE materials and multilayer stacking *** highlights the progress made in the field and also discusses potential future directions for further advancements.

关键词： Dielectric elastomer actuator(DEA) Dielectric elastomer(DE) Material svnthesis Multilaver stacking method

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Resonant tunnelling in nc-Si/SiO_2 multilayers at room temperature

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Journal of Semiconductors 2011年第8期32卷 23-26页

作者：陈德媛 college of Electronic Science & Engineering Nanjing University of Posts and Telecommunications Nanjing National Laboratory of Microstructures and Key Laboratory of advanced Photonic and Electronic materials Department of PhysicsNanjing University

Nc-Si/SiO_2 multilayers were fabricated on silicon wafers in a plasma enhanced chemical vapour deposition system using in situ oxidation technology,followed by three-step thermal *** transportation at room temperature is characterized by current voltage measurement,and negative different conductances can be observed both under forward and negative biases,which is explained by resonant *** resonant tunnelling peak voltage is related to the thicknesses of the nc-Si and SiO_2 *** the resonant tunnelling peak voltage under negative bias is larger than that under forward *** energy band diagram and an equivalent circuit diagram were constructed to analyze and explain the above transportation process and properties.

关键词： resonant tunnelling work function quantum dots

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High-entropy enhanced room-temperature ferroelectricity in rare-earth orthoferrites

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Journal of advanced Ceramics 2023年第4期12卷 724-733页

作者： Bo Ni Ater Bao Yaohang Gu Xiaoyan Zhang Xiwei Qi School of materials Science and Engineering Northeastern UniversityShenyang 110819China School of Resources and materials Northeastern University at QinhuangdaoQinhuangdao 066004China college of Metallurgy and energy North China University of Science and TechnologyTangshan 063210China

Single-phase multiferroic materials of rare-earth orthoferrites with magnetism and ferroelectricity are of great technological importance in storage ***,the polarization(P)of these materials is generally weak(0.01μC-cm^(-2)),and the ferroelectricity is reported to exist below room temperature(25℃).Here,(Bi_(0.2)La_(0.2)Y_(0.2)Dy_(0.2)Tb_(0.2))FeO_(3)(BLYDTFO)high-entropy oxides that exhibit a saturation P of 5.3μ***^(-2)at the electric field(E)of 45 kV·cm^(-1)at room temperature was designed and fabricated by the conventional solid-phase *** results show that configurational entropy introduces atomic disorder and a larger tilt of BO6 octahedron,which facilitates noncentrosymmetric distortion and ferroelectricity at room temperature compared with other single components(LaFeO_(3),YFeO_(3),DyFeO_(3),and TbFeO_(3)).This high-entropy approach expands the compositional window of the rare-earth orthoferrites to enhance the ferroelectricity in multiferroic applications.

关键词： high-entropy rare-earth orthoferrites ferroelectricity multiferroic materials

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