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Effect of alternative magnetic fields with different intensities on microstructure and mechanical properties of M50 steel during vacuum arc remelting

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Journal of Iron and Steel Research International 2025年第3期32卷 629-645页

作者： Guo-dong Deng Zhi-bin Xia Cheng-kuan Ma Yi-feng Guo Zhong-hao Sun Ming-liang Zhang Qi-zheng Chen Qiang Li Zhe Shen Biao Ding Tian-xiang Zheng Chun-mei Liu Yun-bo Zhong School of Materials Science and Engineering Shanghai UniversityShanghai200444China State Key Laboratory of Advanced Special Steel Shanghai UniversityShanghai200444China Shanghai Key Laboratory of Advanced Ferrometallurgy Shanghai UniversityShanghai200444China

The use of an alternative magnetic field during vacuum arc remelting(VAR)can have significant effects on the primary carbide and mechanical properties of M50-bearing *** solidification structure and the primary carbide morphology of the VAR ingot were analyzed by optical microscopy and scanning electron *** and analysis of the growth direction of primary carbides were conducted using high-resolution rapid electron backscatter *** elements segregation was analyzed using an electron probe *** was utilized to conduct numerical simulations to validate the experimental findings and elucidate the underlying *** to traditional VAR,magnetic-controlled VAR generates a horizontal circulation,which makes a shallower and flatter molten pool and a more even temperature *** the time dimension,the local solidification time is shortened,and the concentration of solute elements will be *** the spatial dimension,the secondary dendrite arm spacing decreases,alleviating the degree of inter-dendritic ***,the possibility of forming a segregation *** aspects promote the even distribution of solute atoms,resulting in less segregation and hindering the development of primary *** leads to the refinement of primary carbide size and its uniform *** magnetic-controlled vacuum arc melting not only refines the dendritic structure in the M50 ingot,causing it to expand more axially along the ingot,but also refines primary carbides and improves tensile and wear-resistant mechanical properties.

关键词： Primary carbide Microstructure Magnetic-controlled vacuum arc remelting M50-bearing steel Alternative magnetic field

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Effect of Al2O3 nano sol content in Ni-Al2O3 composite coating on intermetallic compound formation and properties of Mg/Al soldered joints

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Journal of Magnesium and Alloys 2025年第4期13卷 1784-1798页

作者： Liu, Yingzong Li, Yuanxing Cui, Jinzhe Zhu, Zongtao Chen, Hui Key Laboratory of Advanced Technologies of Materials Ministry of Education School of Materials Science and Engineering Southwest Jiaotong University Chengdu610031 China

Combining Mg and Al dissimilar metals further reduces structural weight, but the formation of intermetallic compounds (IMCs) affects Al/Mg joint properties. To prevent IMCs, a Ni-Al2O3 composite coating was pre-plated on the Mg alloy substrate, and then Sn3.0Ag0.5Cu (SAC 305) solder was utilized to facilitate the joining of AZ31 Mg/6061 Al through ultrasonic-assisted soldering. We investigated the impact of Al2O3 nano sol content in the coating on microstructure evolution, IMCs formation, and mechanical properties. Results indicated that the Ni-Al2O3 composite coating effectively suppressed the Mg-Sn reaction, thereby preventing the formation of Mg2Sn IMC and significantly enhancing joint strength. In joints with a Ni-Al2O3 composite coating containing 50 mL/L Al2O3 nano sol, no Mg2Sn IMC was detected after 50 min of holding at 260 °C, achieving a maximum shear strength of approximately 67.2 MPa. Increasing the Al2O3 concentration further expanded the soldering process window. For the joint with Ni-Al2O3 (100 mL/L Al2O3 nano sol) composite coating held at 260 °C for 70 min, the coating was dissolved to a thickness of about 5.8 µm, but no Mg2Sn IMC was observed. The Ni-based solid solution formed near the coating/solder interface was strengthened, leading to fractures occurring within the SAC solder, and the maximum shear strength further increased to 73.9 MPa. The strengthening mechanism of the joints facilitated by using the Ni-Al2O3 composite coating was revealed by comparing with pure Ni-assisted joints. Therefore, employing a Ni-Al2O3 composite coating as a barrier layer represents a promising strategy for inhibiting IMC formation during the joining of dissimilar metals. © 2024

关键词： Composite coatings

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Sulfur poisoned PtNi/C catalysts toward two-electron oxygen reduction reaction for acidic electrosynthesis of hydrogen peroxide

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材料科学技术（英文版） 2025年第1期204卷 268-275页

作者： Xin Yang Lijie Zhong Songxin Ye Dequan He Shuxian Yuan Huixin Li Yuting Ma Xiaocheng Mo Shiyu Gan Li Niu Center for Advanced Analytical Science Guangzhou Key Laboratory of Sensing Materials & DevicesGuangdong Engineering Technology Research Center for Photoelectric Sensing Materials & DevicesKey Laboratory of Optoelectronic Materials and Sensors in Guangdong Provincial UniversitiesSchool of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou 510006China Center for Advanced Analytical Science Guangzhou Key Laboratory of Sensing Materials & DevicesGuangdong Engineering Technology Research Center for Photoelectric Sensing Materials & DevicesKey Laboratory of Optoelectronic Materials and Sensors in Guangdong Provincial UniversitiesSchool of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou 510006China School of Chemical Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China

Selective electrocatalysis of two-electron oxygen reduction reaction(2e-ORR)has been recognized as a sustainable and on-site process for hydrogen peroxide(H2O2)*** progress has been achieved for 2e-ORR in alkaline ***,it is challenged by insufficient activity and selectiv-ity of the catalysts in acidic ***,we report sulfur-poisoned PtNi/C catalysts(PtNiSx/C)that could regulate ORR from the 4e-to *** identified PtNiS0.6/C offers high activity in terms of onset potential of～0.69 V(***)and～80％*** mass activity is also compara-ble and outperforms representative Pt-based precious and transition-metal-based *** addition,it is interestingly found that the Faradaic efficiency further increased to 95％during the long-term elec-trolysis test due to Ni atom surface *** electrochemical production of the H2O2 system was applied to the electro-Fenton process,which has realized the effective degradation of organic *** work offers a strategy by sulfur poisoning PtNi/C catalyst to realize Pt-based 2e-ORR active catalysts to electrolysis of H2O2 in acidic media.

关键词： Oxygen reduction reaction Hydrogen peroxide Acidic media Electrocatalysis

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Mainchain conformation ordering self-assembly tailored room temperature phosphorescence emission

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science China Chemistry 2025年第1期68卷 329-336页

作者： Yuzhu Li Yumeng Gao Feng Tian Yu Wang Yuan Yao Shaoliang Lin Xiang Ma Binbin Xu Shanghai Key Laboratory of Advanced Polymeric Materials Key Laboratory for Ultrafine Materials of Ministry of EducationSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China Key Laboratory for Advance Materials and Feringa Noble Prize Scientist Joint Research Centre Frontiers Science for Materiobiology and Dynamic ChemistrySchool of Chemistry and Molecular EngineeringEast China University of Science&TechnologyShanghai 200237China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China

Developing organic room-temperature phosphorescence(RTP)materials with a wide range of tunable-emission is significant in expanding the applications of RTP ***,we rationally designed amphiphilic alternating copolymers poly(1,2-bis(4-alkoxyphenyl)ethane-1,2-dione-alt-(ethylene glycol)x)(P(Bz-alt-EGx))that combined the advantage of alternating benzil and EGxskeleton,and tunable mainchain *** a mainchain conformation ordering assembly(COA)process,P(Bz-alt-EGx)self-assembled into well-defined platelets,and such assemblies emitted blue RTP at ca.425 nm due to the ordered folded-chain conformation and confined *** contrast,traditional self-assembly(TA)of P(Bz-alt-EGx)obtained less ordered aggregates,such as asymmetric worms,vesicles,and rod-like *** resultant less ordered aggregates exhibited yellow-green RTP at ca.550 *** wide-tuning RTP emission in solution(between blue and yellow-green,over125 nm)is realized using the P(Bz-alt-EG_(x))alternating copolymers under the treatment of different self-assembly *** study uncovers a new strategy to tailor the RTP emission through different self-assembly pathways and holds great promise for the fabrication of advanced optical materials.

关键词： self-assembly conformation ordering alternating copolymer phosphorescence emission

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High temperature performance of silica-based ceramic cores by adding (Mg0.25Co0.25Ni0.25Zn0.25)O medium-entropy oxide as mineralizer

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Ceramics International 2025年第12期51卷 16162-16173页

作者： He, Zhongshu Chen, Peiquan Xuan, Weidong Shao, Guanlan Song, Haorui Wang, Baojun Yang, Zhigang Ren, Zhongming State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering Shanghai University Shanghai 200444 China School of Materials Science and Engineering Engineering Research Center of Matamaterials and Microdevices Shijiazhuang Tiedao University Shijiazhuang050043 China

Silica-based ceramic cores have been widely used in the fabrication of hollow turbine blades due to the superior mechanical properties and good leaching rate. However, the traditional mineralizer materials have been difficult to improve the comprehensive performance of ceramic cores. Herein, silica based ceramic cores doped with different content of (Mg0.25Co0.25Ni0.25Zn0.25)O medium-entropy oxide mineralizer (MEOM) were successfully prepared by press molding method. The results showed that the ceramic cores had the best comprehensive properties when the content of MEOM was 0.6 wt%. The flexural strength at room temperature, porosity and bulk density of ceramic cores was 11.75 MPa, 24.55 % and 1.47 g/cm3, respectively. The flexural strength at high temperature and high temperature deflection was 35.36 MPa and 0.08 mm, respectively. At sintering of 1180 °C, the filled MEOM powders among the silica glass particles was sintered, promoting the densification of the ceramic cores by bridging the silica glass particles. As a result, the flexural strength of the ceramic cores at room temperature was improved, and the porosity was reduced, and the corrosion rate was reduced. Meanwhile, at high temperature of 1550 °C, the partially melted MEOM promoted the precipitation of cristobalite through heterogeneous nucleation by forming fine dispersed particles, thus improving the high temperature performance of the ceramic cores. The paper offers a new route to improve the high temperature properties of ceramic cores by introducing entropy-engineering additives. © 2025

关键词： Sintering

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15.13%Sr-doped CsPbI_(3) quantum dots with near-unity quantum yield via surface ligand compensation

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Nano Research 2025年第4期18卷 534-543页

作者： Yi Peng Wanzhong Gu Yuhui Dong Yucong Ji Danni Yan Ziyun Lin Li Zhang Yousheng Zou Haibo Zeng MIIT Key Laboratory of Advanced Display Materials and Devices Jiangsu Province Engineering Research Center of Quantum Dot DisplaySchool of Materials Science and EngineeringInstitute of Optoelectronics and NanomaterialsNanjing University of Science and TechnologyNanjing 210094China

Sr-doping of perovskite quantum dots(QDs)is a promising strategy to reduce Pb content and improve optical performance and ***,excessive Sr introduces new defects that degrade photoluminescence quantum yield(PLQY).Therefore,it is a challenge to balance high optical performance with high doping concentration for the preparation of environmentally friendly perovskite *** this study,we report the highest Sr/Pb ratios Sr-doped CsPbI_(3) QDs(15.13%)with a near-unity *** balance between high PLQY and high Sr-doping rate is achieved through the introduction of oleylammonium iodide(OAmI)ligand compensation during the anti-solvent purification process,which can form an iodine-enriched environment and effectively passivates the surface defects of QDs caused by excessive ***,the Sr-doped CsPbI_(3) QDs exhibit superior stability in environments with high temperature and humidity or direct contact with *** strategy provides a novel approach for the preparation of lead-less and lead-free QDs with superior optical performance and stability,offering a potential solution for environmentally friendly applications.

关键词： CsPbI_(3)quantum dots Sr-doping ligand compensation photoluminescence quantum yield environmental stability

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Thermo-responsive microneedles patch for transdermal drug delivery via squeezing in diabetic foot ulcers

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材料科学技术（英文版） 2025年第2期205卷 299-314页

作者： Xiaotong Wu Dan Xia Tingting Shi Baoe Li Donghui Wang Chunyong Liang Mingdong Dong Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology School of Materials Science and EngineeringHebei University of TechnologyTianjin 300130China Hebei Key Laboratory of Biomaterials and Smart Theranostics School of Health Sciences and Biomedical EngineeringHebei University of TechnologyTianjin 300130China Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology School of Materials Science and EngineeringHebei University of TechnologyTianjin 300130China Hebei Key Laboratory of Biomaterials and Smart Theranostics School of Health Sciences and Biomedical EngineeringHebei University of TechnologyTianjin 300130China Interdisciplinary Nanoscience Center Aarhus UniversityAarhus CDK-8000Denmark

Microneedle(MN)patches could be a promising treatment for diabetic foot ulcers that plague thousands of people *** reducing skin resistance or increasing driving force can accelerate the effi-ciency of transdermal drug delivery with conventional MN patches,it can create toxic chemical residues or require the help of additional ***,a thermo-responsive microneedles patch(TMN)with high biocompatibility without additional equipment is *** TMN consisted of a bilayer mi-croneedles composed of sodium alginate(SA)-g-poly(N-isopropylacrylamide)layer(SA-g-PNIPAM)loaded with sucrose octasulfate sodium salt(SOS)and hyaluronic acid layer and a polycaprolactone/chitosan nanofiber membrane loading with tetracycline hydrochloride(TH)and *** accelerates drug re-lease by extruding the drug through a volumetric phase transition in response to temperature changes,and TH and SOS promote wound healing by inhibiting bacterial growth and promoting vascular regener-ation and epithelial *** results showed that the drug release of TMN was significantly faster,with the drug release rate of more than 80％in the 10th h,and the antibacterial rate of TMN could reach 800％.In addition,TMN had good biocompatibility and good healing effects in vivo,which may be helpful for the design of multifunctional dressings in the future.

关键词： Microneedles patch Thermal response Transdermal drug delivery Diabetic foot ulcers

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Fabrication of yttrium aluminum garnet phosphor by thermal plasma: A rapid and scalable strategy for multicomponent materials

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Journal of materials science and Technology 2025年 235卷 244-250页

作者： Zhou, Qinqin Li, Hongzheng Gao, Yijie Hu, Peng Wang, Jinshu State Key Laboratory of Materials Low-Carbon Recycling Key Laboratory of Advanced Functional Materials Education Ministry of China School of Materials Science and Engineering Beijing University of Technology Beijing100124 China

We demonstrate a case study of Ce-doped yttrium aluminum garnet (YAG) phosphor to illustrate a novel plasma route for the synthesis of multicomponent materials with addressing morphology and structural control. The presented strategy was started directly from liquid precursors without any precipitating agents, and an innovative growth mechanism was proposed to explain the formation of monodispersed spherical particles with an adjusted size distribution. Homogeneous elemental distribution close to that of liquid precursors was also achieved due to the thermal nonequilibrium effect in plasma. Benefiting from the structural feature of the obtained product, a low transformation temperature of 1100 °C for YAG phase was obtained and final products exhibit the highest photoluminescence intensity with rather low Ce doping of 0.5 wt.%, together with excellent thermal stability of 92 % preservation of initial emission at 473 K. This work well illustrates the advance of plasma strategy in formation of multicomponent compounds with excellent performances, and its potential for large-scale production due to the transient and in-flight synthesis process. © 2025

关键词： Photoluminescence

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Ultrasonic-assisted Hydrothermal Synthesis Autoclaved Bricks from Municipal Solid Waste Incineration Fly Ash and Coal Fly Ash(MSWI-FA)

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Journal of Wuhan University of Technology(materials science) 2025年第2期40卷 439-448页

作者： GUO Xiaolu HU Jiajun WANG Cheng Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education School of Materials Science and EngineeringTongji UniversityShanghai 201804China School of Materials Science and Technology Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsShaanxi University of Science and TechnologyXi’an 710021China

Municipal solid waste incineration fly ash(MSWI)is considered as one of the hazardous wastes and requires to be well disposed to reduce the contaminant to the *** to the production of coal fly ash(FA)bricks,MSWI and FA were utilized to prepare autoclaved MSWI-FA block ***-assisted hydrothermal synthesis technology was used for production to explore the effect of ultrasonic *** strength,dry density,and water absorption tests were conducted to determine the optimal ultrasonic *** pre-treating mechanisms were investigated by SEM,FT-IR,particle size analysis,and ***,the micro-analyses of block samples were *** heavy metal leaching concentration was studied to assess the environmental *** experimental results show that the ultrasonic pre-treating time,water bath temperature,and ultrasonic power of 3 h,30℃,and 840 W are the optimal,under which the compressive strength,dry density,and water absorption were 8.14 MPa,1417.48 kg/m^(3),and 0.38,*** is shown that ultrasound destroys the surface structure of raw materials and smaller FA particles embed into *** particle size distribution of pre-treated raw materials mixture is wider and total pore volume is decreased by 6.3%.During hydrothermal processing,more Al-substituted tobermorite crystals are generated,which is the main source of higher strength and smaller pore volume of prepared block *** solidification/stabilization rates of Cu,Pb,and Zn increased by 30.77%,4.76%,and 35.29%,*** study shows a feasible way to utilize MSWI as raw material for construction.

关键词： municipal solid waste incineration fly ash coal fly ash ultrasonic pre-treatment hydrothermal synthesis environmental safety

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Pyrrole-type TM-N3 sites as high-efficient bifunctional oxygen reactions electrocatalysts: From theoretical prediction to experimental validation

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Journal of Energy Chemistry 2025年第5期104卷 472-481页

作者： Chunxia Wu Yanhui Yu Yiming Song Peng Rao Xingqi Han Ying Liang Jing Li Kai Zhang Zhenjie Zhang Peilin Deng Xinlong Tian Daoxiong Wu School of Marine Science and Engineering School of Chemistry and Chemical Engineering State Key Laboratory of Marine Resource Utilization in South China Sea Hainan University Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Nankai University

Efficient catalysis of the oxygen reduction reaction（ORR） and oxygen evolution reaction（OER） is essential for the rechargeable zinc-air batteries（R-ZABs）. However, challenges remain due to the scarcity of effective bifunctional electrocatalysts and limited understanding of the structure-activity ***-type single-atom catalysts（SACs） with unique electronic structures have emerged as promising electrocatalysts. In this work, we combine density functional theory（DFT） calculations and experimental studies to systematically explore the structure-activity relationships and potential of pyrrole-type transition metal-N3（TM-po-N3） as bifunctional catalysts. DFT calculations reveal that differences in the dependence of ORR and OER activities on the free energy of adsorption of reaction intermediates significantly affect the TM-po-N3bifunctional activity and identify magnetic Cu-po-N3as the best *** bifunctional activity of Cu-po-N3originates from interactions between spin-polarized out-of-plane Cu＿3d and O＿2s+2p orbitals. Theoretical predictions are validated experimentally, showing that the synthesized Cu-SAC/NC exhibits excellent bifunctional performance with a small potential gap of 0.666 ***, the assembled R-ZABs display a high-power density of 170 mW cm-2and long-term stability, with the charge-discharge voltage gap increasing by only 0.01 V over 240 h. This work provides new insights into the design of efficient bifunctional catalysts.

关键词： Oxygen evolution reaction Oxygen reduction reaction Rechargeable zinc-air battery Single-atom catalysts Structure-activity relationship

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