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Influence of Cold-Rolling Reduction on Microstructure and Tensile Properties of Nuclear FeCrAl Alloy with Low Cr and Nb Contents

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Acta Metallurgica Sinica(English Letters) 2022年第12期35卷 2101-2110页

作者： Hui Wang Biao Guo Xuguang An Yu Zhang Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of ChinaChengdu 610213China School of Materials Science and Engineering Xihua UniversityChengdu 610039China Interdisciplinary Materials Research Center Institute for Advanced StudyChengdu UniversityChengdu 610106China

FeCrAl alloy is one of the most promising candidates as an accident-tolerant fuel(ATF)cladding material.Herein,the influence of cold-rolling(CR)reduction on microstructure and tensile properties of the as-annealed FeCrAl alloys,with low Cr and Nb contents,is systematically examined.With the increase in CR reduction,the grain size of FeCrAl alloy is obviously refined after annealing because the increase in stored deformation energy leads to enhanced recrystallization.However,the large CR reductions result in a severe mixed-grain microstructure,significantly reducing the uniform deformability of the FeCrAl alloy.The dislocation density of the as-annealed FeCrAl alloy decreases with the increase in CR reduction,except for the excessive CR reduction of 50%.Moreover,the Laves phases are crushed and dissolved during CR and annealing,as well as large amounts of refined Laves phases are found after large CR reductions.The pinning effect of the Laves phases can significantly improve the strength of FeCrAl alloy.Accordingly,the strengthening mechanisms of FeCrAl alloy consist of fine-grain strengthening,dislocation strengthening and precipitation strengthening.Finally,the FeCrAl alloy,with a CR reduction of 30%,achieves optimal tensile properties.This study can provide theoretical guidance for the industrial production of the FeCrAl alloy.

关键词： FeCrAl alloy Cold-rolling reduction Tensile properties Microstructure evolution Strengthening mechanism

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Hygrothermal ageing characterisation of epoxy resin based on transmission characteristics of microwave resonator with interdigital‐capacitor‐shaped defected ground structure

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High Voltage 2023年第6期8卷 1188-1195页

作者： Mi Xiao Wei Zhang xuguang Wang Key Laboratory of the Ministry of Education on Smart Power Grids School of Electrical and Information EngineeringTianjin UniversityTianjinChina

In this article,a method is proposed for the characterisation of epoxy resin thermal and hygrothermal ageing based on microwave resonator with interdigital‐capacitor‐shaped defected ground structure(IDCS‐DGS),which can realise rapid and simple non‐destructive testing of the ageing degree of epoxy resin materials.The resonant frequency of IDCS‐DGS was proved to decrease with the increase of dielectric constant of the around material by means of simulation.The breakdown test at high voltage showed the deterio-ration of epoxy resin after hygrothermal ageing,which is caused by moisture absorption and hydrolysis process.In addition,thermal ageing also caused a decline in the insulation per-formance of epoxy resin samples.Accelerated oxidation of epoxy resin samples at high temperatures produces polar molecules that increase the dielectric constant of the samples.As for the hygrothermal ageing samples,the entrance of polar water molecules will increase the dielectric constant of epoxy resin,and thus make an effect on the resonant frequency of IDCS‐DGS.The tests of transmission performance show that after the hygrothermally aged epoxy resin samples were put on the microwave sensor,the resonant frequency decreased continuously with hygrothermal ageing time,and the deviations of resonant frequency are highly consistent with the weight variation rate of the samples.

关键词： resin thermal microwave

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Design of heterojunction with components in different dimensions for electrocatalysis applications

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Frontiers of physics 2022年第4期17卷 55-58页

作者： Qingquan Kong Xuguang An Jing Zhang Weitang Yao Chenghua Sun School of Mechanical Engineering Chengdu UniversityChengdu 610106China Interdisciplinary Materials Research Center Institute for Advanced StudyChengdu UniversityChengdu 610106China Department of Chemistry and Biotechnology and Center for Translational AtomaterialsSwinburne University of TechnologyHawthornVIC 3122Australia

Searching for high-performance and cost-effective catalysts is of particular importance for the practical electrocatalysis applications.The heterojunctions with components in different dimensions show unique physical and chemical properties,which can offer large space for rational design of electrocatalysts.In this paper,we firstly reviewed recently related works,and then proposed a few perspectives on exploring heterojunction for electrocatalysis applications.

关键词： heterojunction electrocatalysis multiple dimension

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Analysis of the Pull Effect of Local Government Special-Purpose Bond Investment on Economic Growth Under the Input-Output Framework

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Journal of Systems Science and Information 2023年第4期11卷 451-465页

作者： xuguang SUN Jian XU School of Economics and Management University of Chinese Academy of SciencesBeijing 100190China

In this paper,we discuss the development process of local government special bonds,and the role channels of local government special debt investment in driving China’s economic growth.Based on the specific decomposition of Xinjiang local government special bond investment,this paper uses the non-competitive input-output model for the first time to analyze the net pulling effect of Xinjiang local government special bond investment on Xinjiang’s GDP and employment in 2020.Two measure calibers are set in this paper based on whether the financing costs are considered or not;in addition,we set up four scenarios based on two conditions:Whether to consider retained fun and whether to consider using special-purpose bond investment to leverage social capital.The results show that:1)when financing costs are not considered,the RMB77.4 billion local government special-purpose bonds can push the GDP of Xinjiang to grow by RMB42.27 billion,RMB35.12 billion,RMB77.548billion and RMB69.34 billion respectively under the four scenarios;2)when financing costs are not considered,the number of jobs driven by the RMB77.4 billion local government special-purpose bonds was respectively 372,300,324,500,718,500 and 601,300 in the four scenarios;3)when financing costs are considered,the RMB77.4 billion local government special-purpose bonds can push the GDP of Xinjiang to grow by RMB71.876 billion and RMB64.268 billion under scenario 3)and scenario 4).

关键词： local government special purpose bond investment non-competitive input-output model value-added

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Advances in pig models of human diseases

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Animal Models and Experimental Medicine 2022年第2期5卷 141-152页

作者： Naipeng Hou xuguang Du Sen Wu College of Animal Science and Technology China Agricultural UniversityBeijingChina Sanya Institute of China Agricultural University SanyaChina State Key Laboratory of Agrobiotechnology College of Biological SciencesChina Agricultural UniversityBeijingChina

Animal models of human diseases play a critical role in medical research.Pigs are anatomically and physiologically more like humans than are small rodents such as mice,making pigs an attractive option for modeling human diseases.Advances in recent years in genetic engineering have facilitated the rapid rise of pig models for use in studies of human disease.In the present review,we summarize the current status of pig models for human cardiovascular,metabolic,neurodegenerative,and various genetic diseases.We also discuss areas that need to be improved.Animal models of human diseases play a critical role in medical research.Advances in recent years in genetic engineering have facilitated the rapid rise of pig models for use in studies of human disease.In the present review,we summarize the current status of pig models for human cardiovascular,metabolic,neurodegenerative,various genetic diseases and xenotransplantation.

关键词： animal model gene-editing human disease pig

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Introducing Ce ions and oxygen defects into V_(2)O_(5)nanoribbons for efficient aqueous zinc ion storage

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Nano Research 2023年第2期16卷 2445-2453页

作者： Mingying Bao Zhengchunyu Zhang Xuguang An Jie Liu Jinkui Feng Baojuan Xi Shenglin Xiong Key Laboratory of Colloid and Interface Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringState Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China Key Laboratory of Mechanical Engineering of Education School of Mechanical EngineeringChengdu UniversityChengdu 610106China Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China School of Materials Science and Engineering Shandong UniversityJinan 250061China

Cost-effectively,eco-friendly rechargeable aqueous zinc-ion batteries(AZIBs)have reserved widespread concerns and become outstanding candidate in energy storage systems.However,the progress pace of AZIBs suffers from limitation of suitable and affordable cathode materials.Herein,a double-effect strategy is realized in a one-step hydrothermal treatment to prepare V_(2)O_(5)nanoribbons with intercalation of Ce and introduction of abundant oxygen defects(Od-Ce@V_(2)O_(5))to enhance electrochemical performance synergistically.Coupled with the theoretical calculation results,the introduction of Ce ions intercalation and oxygen vacancies in V2O5 structure enhances the electrical conductivity,reduces the adsorption energy of zinc ions,enlarges the interlayer distance,renders the structure more stable,and facilitates rapid diffusion kinetics.As expected,the desirable cathode delivers the reversible capacity of 444 mAh·g^(−1)at 0.5 A·g^(−1)and shows excellent Coulombic efficiency,as well as an extraordinary energy density of 304.9 Wh·kg^(−1).The strategy proposed here may aid in the further development of cathode materials with stable performance for AZIBs.

关键词： double-effect Ce element doping oxygen defects Od-Ce@V_(2)O_(5) aqueous zinc-ion batteries

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Molybdenum Oxynitride Atomic Nanoclusters Bonded in Nanosheets of N-Doped Carbon Hierarchical Microspheres for Efficient Sodium Storage

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Nano-Micro Letters 2022年第10期14卷 148-163页

作者： Xiaona Pan Baojuan Xi Huibing Lu Zhengchunyu Zhang Xuguang An Jie Liu Jinkui Feng Shenglin Xiong School of Chemistry and Chemical Engineering State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100People’s Republic of China School of Mechanical Engineering Chengdu UniversityChengdu 610106People’s Republic of China The State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050People’s Republic of China School of Materials Science and Engineering Shandong UniversityJinan 250100People’s Republic of China

Transition metal nitrides have attracted considerable attention as great potential anode materials due to their excellent metallic conductivity and high theoretical specific capacity.However,their cycling performance is impeded by their instability caused by the reaction mechanism.Herein,we report the engineering and synthesis of a novel hybrid architecture composed of MoO2.0N0.5 atomic nanoclusters bonded in nanosheets of N-doped carbon hierarchical hollow microspheres(MoO2.0N0.5/NC)as an anode material for sodium-ion batteries.The facile self-templating strategy for the synthesis of MoO2.0N0.5/NC involves chemical polymerization and subsequent one-step calcination treatments.The design is benefi-cial to improve the electrochemical kinetics,buffer the volume variation of electrodes during cycling,and provide more interfacial active sites for sodium uptake.Due to these unique structural and compositional merits,these MoO2.0N0.5/NC exhibits excellent sodium storage performance in terms of superior rate capability and stable long cycle life.The work shows a feasible and effective way to design novel host candidates and solve the long-term cycling stability issues for sodium-ion batteries.

关键词： Molybdenum oxynitride Atomic nanocluster Hollow microspheres Sodium-ion batteries

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Rational cathode configuration with bilayer membranes to engineer current-collector-free high-areal-sulfur lithium-sulfur batteries

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Nano Research 2024年第6期17卷 5224-5232页

作者： Jianmei Han Hua Zhang Peng Wang Ning Song Xuguang An Baojuan Xi Shenglin Xiong College of Chemistry and Chemical Engineering Taishan UniversityTai’an 271021China Key Laboratory of the Colloid and Interface Chemistry Ministry of Educationand School of Chemistry and Chemical EngineeringShandong UniversityJinan 250100China School of Mechanical Engineering Chengdu UniversityChengdu 610106China

The application of light-weight current collectors is preferred because of the increased energy density of the batteries.Bearing it in mind,the cathode is designed with self-made paperlike memberane as current collector coupled with another interlayer to enable the high-energy-density lithium-sulfur batteries.Via a facile and green step-by-step methodology,the hybrid membrane is finalized successfully,consisting of reduced graphene oxide sheets covering paper-derived carbon(GPC)bearing Fe@Fe2O3 and Fe1−xS@Fe2O3 core-shell nanoparticles(FeFeO/FeSFeO@GPC).The film works as the current collector and interlayer simultaneously considering the porous and conductive features.As demonstrated by the electrochemical testing,the FeFeO/FeSFeO@GPC hybrid cell exhibits attractive cycling stability and superior rate capability.The cell configuration and structural/composition merits of FeFeO/FeSFeO@GPC film facilitate the faster reaction kinetics,conducive to the improvement of capacity retention.In view of the effective cathode design,the areal sulfur loading is increased to 10.46 mg·cm^(−2)and a reversible capacity of 6.67 mAh·cm^(−2)can be retained after 60 cycles at 0.1 C.

关键词： light-weight self-made current collector core-shell high-areal-sulfur lithium-sulfur batteries

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MoSe_(2)/TiO_(2)heterostructure integrated in N-doped carbon nanosheets assembled porous core-shell microspheres for enhanced sodium storage

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Nano Research 2023年第7期16卷 9398-9406页

作者： Nianxiang Shi Guangzeng Liu Baojuan Xi Xuguang An Changhui Sun Xinzheng Liu Shenglin Xiong School of Chemistry and Chemistry Engineering Qilu Normal UniversityJinan 250200China School of Chemistry and Chemical Engineering and State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China School of Mechanical Engineering Chengdu UniversityChengdu 610106China

Engineering the structure and composition of electrode materials is one of the essential means for achieving excellent electrochemical performance.The rational design of Na+host materials is still a massive challenge for sodium ion batteries(SIBs).Herein,MoSe_(2)/TiO_(2)heterostructure is integrated with N-doped carbon nanosheets to assemble into hierarchical flowerlike porous core-shell microspheres(MoSe_(2)/TiO_(2)@N-C),which is firstly reported by room-temperature stirring coupled with vulcanization treatment.The cavity of the core-shell structure could provide enough storage space for Na+and alleviate the volume expansion during charge/discharge processes.The apertures between nanosheets provide a guarantee for the rapid penetration of electrolyte to enhance the utilization rate of electrode materials.Furthermore,building heterostructures by combining different phase structures can facilitate electron transfer and accelerate reaction kinetics.Benefiting from the synergistic contributions of structure and composition,MoSe_(2)/TiO_(2)@N-C as SIBs anode material shows better reversible capacities of 302.5 mAh·g^(-1)at 1 A·g^(-1)for 400 cycles and 217.4 mAh·g^(-1)at 4 A·g^(-1)for 900 cycles.Strikingly,the reversible capacities can be restored entirely to the initial level after a high current density cycle.

关键词： MoSe_(2)/TiO_(2) flower-like hierarchical porous core-shell microspheres heterostructure sodium ion batteries

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Effect of the MgO/SiO_(2) ratio on MgO–silica binders solidifying MSWI fly ash

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Waste Disposal and Sustainable Energy 2023年第4期5卷 551-558页

作者： Yin Duan Xiaobo Liu Zeinab Khalid xuguang Jiang State Key Laboratory of Clean Energy Utilization Institute for Thermal Power EngineeringZhejiang UniversityHangzhou310027China Zhejiang University Qingshanhu Energy Research Center LinanHangzhou311305China

To improve the effect of MgO–SiO_(2) binders solidifying municipal solid waste incineration fly ash(MSWI FA),MSWI FA solidified bodies with five MgO/SiO_(2) ratios(0.41~3.77)were investigated.The leaching behavior of solidified bodies was evaluated by leaching toxicity tests and pH-dependent experiments.In addition,hydration products in solidified bodies were analyzed by thermodynamic modeling and microstructure characterizations.The results showed that the variation in the MgO/SiO_(2) ratio had a significant effect on the leaching toxicity of the solidified bodies,because it affected the leachate pH and the composition of the hydration products of the solidified bodies.The acid and alkali resistance of the MSWI FA was enhanced through solidification with MgO–SiO_(2) binders.MgO can improve the alkalinity of the solidified bodies and facilitate the chemical precipitation of heavy metals.Moreover,silica fume,an industrial waste,can serve as a cost-effective measure.Overall,MgO–SiO_(2) binders demonstrated great potential as promising candidates for encapsulating MSWI FA.

关键词： Municipal solid waste incineration fly ash MgO/SiO_(2)ratio Heavy metals Immobilization Leaching behavior

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