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Microstructural evolution during tempering process and mechanical properties of Cr-Ni-Mo-V/Nb high strength steel

Journal of Iron and Steel Research International 2025年第1期32卷 270-281页

作者： Zi-wei Lv Jing Fan Rui Wang Zhi-qiang Yu Yan Kang Yong Hu Lei-feng Tuo Jürgen Eckert Zhi-jie Yan school of materials science and engineering North University of ChinaTaiyuan 030051ShanxiChina Shanxi Key Laboratory of Advanced Metal materials for Special Environments North University of ChinaTaiyuan 030051ShanxiChina school of materials science and engineering Taiyuan University of Science and TechnologyTaiyuan 030024ShanxiChina Erich Schmid Institute of materials science Austrian Academy of SciencesLeoben 8700Austria department of materials science Chair of Materials PhysicsMontanuniversitat LeobenLeoben 8700Austria

High strength steels exhibit superior mechanical properties due to the unique microstructure,which successfully solves the drawback of the inevitable strength-toughness trade-off that occurs in traditional *** we investigated the effect of matrix and precipitates on mechanical properties of Cr-Ni-Mo-V/Nb steel after water quenching and tempering(150-500℃).The results showed that the microstructure of the present steel is noticeably tuned by changing the tempering *** excellent combination of strength(a yield strength of 1308 MPa with a total elongation of 8.2%)and toughness(Charpy V-notch impact toughness of 40.5 J/cm^(2))is obtained upon tempering at 200℃.This is attributed to the lath martensite containing high dislocation density,the martensite-twin substructure,and the strengthening effects of the precipitated needle-likeε-carbides and spherical VC *** acicularε-carbides are replaced by the rod-shaped Fe_(3)C at the tempering temperature of 350℃,resulting in the remarkable deterioration in strength,hardness,and *** carbides formed at a tempering temperature of 500℃ are beneficial to the enhancement of the elongation and toughness,but the strength decreases due to the matrix softening caused by the recovery of dislocation.

关键词： High strength steel Tempering Microstructure Carbide Mechanical property

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Atomically precise M-N-C electrocatalysts for oxygen reduction:Effects of inter-site distance,metal-metal interaction,coordination environment,and spin states

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Journal of Energy Chemistry 2025年第2期101卷 132-155页

作者： Junfeng Huang Saira Ajmal Anuj Kumar Jianwen Guo Mohammed Mujahid Alam Abdullah G.Al-Sehemi Ghulam Yasin school of Mechanical engineering Dongguan University of Technology Nano-Technology Research Laboratory Department of Chemistry GLA University department of Chemistry College of Science King Khalid University school of Environmental science and engineering Tianjin University State Key Laboratory of Chemical Resource engineering College of Materials Science and Engineering Beijing University of Chemical Technology

Inspired by molecular catalysts,researchers developed atomically precise nitrogen-coordinated single or dual metal sites imbedded in graphitized carbon（M-N-C） to fully utilize metallic sites for *** catalysts performed remarkably well in the electrocatalytic oxygen reduction reaction（ORR） due to their distinct coordination and electrical structures,Nonetheless,their maximum efficacy in practical applications has yet to be *** agenda identifies tailoring the coordination environment,spin states,intersite distance,and metal-metal interaction as innovative approaches to regulate the ORR performance of these ***,it is necessary to undertake a precise assessment of these methodologies and the knowledge obtained to be implemented in the design of future M-N-C catalysts for ***,this review aims to analyze recent progress in M-N-C ORR catalysts,emphasizing their innovative engineering with aspects such as alteration in intersite distance,metal-metal interaction,coordination environment,and spin ***,we critically discuss how to logically monitor the atomic structure,local coordination,spin,and electronic states of M-N-C catalysts to modulate their ORR *** have also highlighted the challenges associated with M-N-C catalysts and proposed suggestions for their future design and fabrication.

关键词： Activity descriptors Electrocatalysis M-N-C electrocatalysts ORR Spin states

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Accurate design of a novel high-performance 11-pole triple-mode dielectric resonator BPF with fully controllable multiple transmission zeros for mobile communication base stations

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science China(Information sciences) 2025年第2期68卷 387-388页

作者： Fan LIU Zhewang MA Masataka OHIRA Dongchun QIAO Guosheng PU Masaru ICHIKAWA Hunan Provincial Key Laboratory of Flexible Electronic materials Genome engineering School of Physics and Electronic SciencesChangsha University of Science and Technology graduate school of science and engineering Saitama University Faculty of science and engineering department of Electronics Doshisha University Huawei Technologies Japan K.K.

High performance dielectric resonator(DR) bandpass filters(BPFs) are critical components in modern RF/microwave front-end systems due to their many distinctive advantages like low loss, small size, light weight, and temperature-stable properties. In recent years, the rapid development of various wireless communication techniques is demanding much more critical specifications for microwave BPFs with better performance but further reduced loss, size, and *** a prospective approach to meet these stringent requirements, BPFs using triple-mode DRs are attracting much attention from both academia and industry [1–5].

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Interfacial Zn^(2+)-solvation regulator towards reversible and stable Zn anode

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Journal of Energy Chemistry 2025年第1期100卷 684-692页

作者： Miao Zhou Xiongbin Luo Hang Li Shan Guo Zhuang Tong Xiaotao Zhou Xu Li Zhaohui Hou Shuquan Liang Guozhao Fang College of Mechanical engineering Key Laboratory of Hunan Province for Advanced Carbon-based Functional MaterialsHunan Institute of Science and TechnologyYueyang 414006HunanChina school of materials science and engineering Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan ProvinceCentral South UniversityChangsha 410083HunanChina College of materials and metallurgy Guizhou UniversityGuiyang 550000GuizhouChina National Energy Metal Resources and New materials Key Laboratory Central South UniversityChangsha 410083HunanChina

Aqueous zinc-ion batteries (AZIBs) are fundamentally challenged by the instability of the electrode/electrolyte interface,predominantly due to irreversible zinc (Zn) deposition and hydrogen ***,the intricate mechanisms behind the electrochemical discrepancies induced by interfacial Zn^(2+)-solvation and deposition behavior demand comprehensive *** molecules endowed with special functional groups (such as hydroxyl,carboxyl,etc.) have the potential to significantly optimize the solvation structure of Zn^(2+)and regulate the interfacial electric double layer (EDL).By increasing nucleation overpotential and decreasing interfacial free energy,these functional groups facilitate a lower critical nucleation radius,thereby forming an asymptotic nucleation model to promote uniform Zn ***,this study presents a pioneering approach by introducing trace amounts of n-butanol as solvation regulators to engineer the homogenized Zn (H-Zn) anode with a uniform and dense *** interfacial reaction and structure evolution are explored by in/ex-situ experimental techniques,indicating that the H-Zn anode exhibits dendrite-free growth,no by-products,and weak hydrogen evolution,in sharp contrast to the bare ***,the H-Zn anode achieves a remarkable Zn utilization rate of approximately 20% and simultaneously sustains a prolonged cycle life exceeding 500 ***,the H-Zn//NH_(4)V_(4)O^(10)(NVO) full battery showcases exceptional cycle stability,retaining 95.04%capacity retention after 400 cycles at a large current density of 5 A g^(-1).This study enlightens solvation-regulated additives to develop Zn anode with superior utilization efficiency and extended operational lifespan.

关键词： Aqueous zinc-ion batteries Zn^(2+)-solvation structure Interfacial reaction Asymptotic nucleation model Reversible and stable Zn anode

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Review of precipitation strengthening in ultrahigh-strength martensitic steel

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International Journal of Minerals,metallurgy and materials 2025年第2期32卷 256-269页

作者： Zhihao Tian Chunlei Shang Chaolei Zhang Xiaoye Zhou Honghui Wu Shuize Wang Guilin Wu Junheng Gao Jiaming Zhu Xinping Mao Institute for Carbon Neutrality University of Science and Technology BeijingBeijing 100083China Institute of Steel Sustainable Technology Liaoning Academy of MaterialsShenyang 110004China department of materials science and engineering Shenzhen MSU-BIT UniversityShenzhen 518172China Institute of materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China school of Civil engineering Shandong UniversityJinan 250061China

Martensite is an important microstructure in ultrahigh-strength steels,and enhancing the strength of martensitic steels often involves the introduction of precipitated phases within the martensitic *** considerable research efforts devoted to this area,a systematic summary of these advancements is *** review focuses on the precipitates prevalent in ultrahigh-strength martensitic steel,primarily carbides(e.g.,MC,M_(2)C,and M_(3)C)and intermetallic compounds(e.g.,Ni Al,Ni_(3)X,and Fe_(2)Mo).The precipitation-strengthening effect of these precipitates on ultrahigh-strength martensitic steel is discussed from the aspects of heat treatment processes,microstructure of precipitate-strengthened martensite matrix,and mechanical ***,a perspective on the development of precipitation-strengthened martensitic steel is presented to contribute to the advancement of ultrahigh-strength martensitic *** review highlights significant findings,ongoing challenges,and opportunities in the development of ultrahigh-strength martensitic steel.

关键词： ultrahigh-strength martensitic steel precipitation strengthening mechanical property carbide intermetallic compound

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La-substituted W-type barium-nickel ferrites for tunable and high-performance electromagnetic wave absorption

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International Journal of Minerals,metallurgy and materials 2025年第3期32卷 645-656页

作者： Long Wang Jiurong Liu Shenghui Xie Yanli Deng Zhou Wang Shanyue Hou Shengying Yue Gang Wang Na Wu Zhihui Zeng Key Laboratory for Liquid-Solid Structural Evolution and Processing of materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061China Electronic materials Research Laboratory Key Laboratory of the Ministry of Education and International Center for Dielectric ResearchSchool of Electronic Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China Army engineering University of PLA College of Field engineering Nanjing 210007China Laboratory for Multiscale Mechanics and Medical science State Key Laboratory for Strength and Vibration of Mechanical StructuresSchool of AerospaceXi’an Jiaotong UniversityXi’an 710049China department of Electrical and Computer engineering Beckman Institute for Advanced Science and TechnologyUniversity of Illinois at Urbana-ChampaignUrbana 61801USA school of Chemistry and Chemical engineering Shandong UniversityJinan 250100China

W-type barium-nickel ferrite(BaNi_(2)Fe_(16)O_(27))is a highly promising material for electromagnetic wave(EMW)absorption be-cause of its magnetic loss capability for EMW,low cost,large-scale production potential,high-temperature resistance,and excellent chemical ***,the poor dielectric loss of magnetic ferrites hampers their utilization,hindering enhancement in their EMW-absorption *** efficient strategies that improve the EMW-absorption performance of ferrite is highly desired but re-mains ***,an efficient strategy substituting Ba^(2+)with rare earth La^(3+)in W-type ferrite was proposed for the preparation of novel La-substituted ferrites(Ba_(1-x)LaxNi_(2)Fe_(15.4)O_(27)).The influences of La^(3+)substitution on ferrites’EMW-absorption performance and the dissipative mechanism toward EMW were systematically explored and ***^(3+)efficiently induced lattice defects,enhanced defect-induced polarization,and slightly reduced the ferrites’bandgap,enhancing the dielectric properties of the ***^(3+)also enhanced the ferromagnetic resonance loss and strengthened magnetic *** effects considerably improved the EMW-absorption perform-ance of Ba_(1-x)LaxNi_(2)Fe_(15.4)O_(27)compared with pure W-type *** x=0.2,the best EMW-absorption performance was achieved with a minimum reflection loss of-55.6 dB and effective absorption bandwidth(EAB)of 3.44 GHz.

关键词： electromagnetic wave absorption W-type barium ferrite rare earth dielectric

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Methanol steam mediated corrosion engineering towards high-entropy NiFe layered double hydroxide for ultra-stable oxygen evolution

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Chinese Chemical Letters 2025年第1期36卷 338-343页

作者： Jinqiang Gao Haifeng Yuan Xinjuan Du Feng Dong Yu Zhou Shengnan Na Yanpeng Chen Mingyu Hu Mei Hong Shihe Yang Guangdong Provincial Key Laboratory of Nano-Micro materials Research School of Advanced MaterialsPeking University Shenzhen Graduate School(PKUSZ)Shenzhen 518055China school of Chemical engineering and Technology Xi’an Jiaotong UniversityXi’an 710049China department of Physics Hong Kong Baptist UniversityHong Kong 999077China

Rational design of viable routes to obtain efficient and stable oxygen evolution reaction(OER)electrocatalysts remains challenging,especially under industrial ***,we provide a solvent-steam assisted corrosion engineering strategy to directly fabricate high-entropy NiF e-LDH with spatially resolved structural *** fluoride in methanol steam enables the formation of nanosheets while Fe^(3+)effectively enhances their adhesion to the semi-sacrificial nickel-iron foam(NFF),thereby conjuring up a Ni Fe-LDH@NFF catalyst that exhibits remarkable adaptability to robust electrochemical activation yet with excellent *** measurements reveal the in-situ formation of high-valance metal oxyhydroxide and the enhancement of adsorption-desorption *** the industrial condition(6 mol/L KOH,60℃),the Ni Fe-LDH@NFF exhibits excellent activity of 50 mA/cm^(2) at 1.55 V and high durability of over 120 h at 200 mA/cm^(2).We anticipate that the steam assisted strategy could promote the development of efficient non-precious electrocatalysts for hydrogen energy.

关键词： High-entropy material Corrosion engineering NiFe-LDH Oxygen evolution reaction Stability

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Phase changes and electromagnetic wave absorption performance of XZnC(X=Fe/Co/Cu)loaded on melamine sponge hollow carbon composites

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International Journal of Minerals,metallurgy and materials 2025年第3期32卷 566-577页

作者： Xiubo Xie Ruilin Liu Chen Chen Di Lan Zhelin Chen Wei Du Guanglei Wu school of Environmental and Material engineering Yantai UniversityYantai 264005China school of materials science and engineering Hubei University of Automotive TechnologyShiyan 442002China Shandong Key Laboratory of Eco-Environmental science for the Yellow River Delta Shandong University of AeronauticsBinzhou 256603China Institute of materials for Energy and Environment State Key Laboratory of Bio-fibers and Eco-textilesCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071China

Non-stoichiometric carbides have been proven to be effective electromagnetic wave(EMW)absorbing *** this study,phase and morphology of XZnC(X=Fe/Co/Cu)loaded on a three dimensional(3D)network structure melamine sponge(MS)carbon composites were investigated through vacuum filtration followed by *** FeZnC/CoZnC/CuZnC with carbon nanotubes(CNTs)were uniformly dispersed on the surface of melamine sponge carbon skeleton and Co-containing sample exhibits the highest CNTs *** minimum reflection loss(RL_(min))of the CoZnC/MS composite(m_(composite):m_(paraffin)=1:1,m represents mass)reached-33.60 dB,and the effective absorption bandwidth(EAB)reached 9.60 *** outstanding electromagnetic wave absorption(EMWA)properties of the CoZnC/MS composite can be attributed to its unique hollow structure,which leads to multiple reflections and *** formed conductive network improves dielectric and conductive *** incorporation of Co enhances the magnetic loss capability and optimizes interfacial polarization and dipole *** simultaneously improving dielectric and magnetic losses,ex-cellent impedance matching performance is *** clarification of element replacement in XZnC/MS composites provides an effi-cient design perspective for high-performance non-stoichiometric carbide EMW absorbers.

关键词： electromagnetic wave absorption three dimensional network structure melamine sponge derived carbon non-stoichiometric carbide

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Dual‑Donor‑Induced Crystallinity Modulation Enables 19.23% Efficiency Organic Solar Cells

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Nano-Micro Letters 2025年第3期17卷 376-388页

作者： Anhai Liang Yuqing Sun Sein Chung Jiyeong Shin Kangbo Sun Chaofeng Zhu Jingjing Zhao Zhenmin Zhao Yufei Zhong Guangye Zhang Kilwon Cho Zhipeng Kan Center On Nanoenergy Research Institute of Science and Technology for Carbon Peak&NeutralitySchool of Physical Science&TechnologyGuangxi UniversityNanning 530004People’s Republic of China department of Chemical engineering Pohang University of Science and TechnologyPohang 37673South Korea College of New materials and New Energies Shenzhen Technology UniversityShenzhen 518118People’s Republic of China Zhejiang engineering Research Center for Fabrication and Application of Advanced Photovoltaic materials School of Materials Science and EngineeringNingboTech UniversityNingbo 315100People’s Republic of China State Key Laboratory of Featured Metal materials and Life-Cycle Safety for Composite Structures Nanning 530004People’s Republic of China

Trap-assisted charge recombination is one of the primary limitationsof restricting the performance of organic solar cells. However, effectivelyreducing the presence of traps in the photoactive layer remains ***, wide bandgap polymer donor PTzBI-dF is demonstrated as an effectivemodulator for enhancing the crystallinity of the bulk heterojunction active layerscomposed of D18 derivatives blended with Y6, leading to dense and orderedmolecular packings, and thus, improves photoluminescence quenching *** a result, the photovoltaic devices exhibit reduced trap-assisted charge recombinationlosses, achieving an optimized power conversion efficiency of over 19%.Besides the efficiency enhancement, the devices comprised of PTzBI-dF as athird component simultaneously attain decreased current leakage, improved chargecarrier mobilities, and suppressed bimolecular charge recombination, leading toreduced energy losses. The advanced crystalline structures induced by PTzBI-dFand its characteristics, such as well-aligned energy level, and complementaryabsorption spectra, are ascribed to the promising performance *** findings suggest that donor phase engineering is a feasible approach to tuning the molecular packings in the active layer, providingguidelines for designing effective morphology modulators for high-performance organic solar cells.

关键词： Trap-assisted charge recombination Photoluminescence Miscibility Current leakage Power conversion efficiency

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Corrosion resistance and antibacterial properties of Ti−3Cu alloy prepared by selective laser melting

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Transactions of Nonferrous Metals Society of China 2025年第1期35卷 143-156页

作者： Meng-zhen ZHU Jing-lei MIAO Xiong-wen ZHOU Er-lin ZHANG Zhi-lin LIU Hai-lin YANG State Key Laboratory of Powder metallurgy Central South UniversityChangsha 410083China The Third Xiangya Hospital Central South UniversityChangsha 410013China department of Prosthodontics Centre of StomatologyXiangya HospitalCentral South UniversityChangsha 410008China Key Laboratory for Anisotropy and Texture of materials Ministry of EducationSchool of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Light Alloy Research Institute College of Mechanical and Electrical EngineeringCentral South UniversityChangsha 410083China

The corrosion resistance and antibacterial properties of Ti−3Cu alloy prepared by selective laser melting were evaluated using electrochemical experiments and a variety of antibacterial *** is found that the charge transfer resistance of Ti−3Cu alloy was 4.89×10^(5)Ω∙cm^(2),which was doubled the data obtained by CP-Ti *** antibacterial rates of Ti−3Cu alloy against *** and *** were 45.0%and 54.5%.And the antibacterial rates increased with the prolongation of cultivation time,reaching up to 62.8%and 68.6%,*** in-situ nano Ti_(2)Cu precipitates were homogeneously distributed in the matrix of the Ti−3Cu alloy,which was the key reason of increasing the corrosion ***,the microscale electric fields between theα-Ti matrix and the Ti_(2)Cu was responsible for the enhancement of the antibacterial properties.

关键词： selective laser melting Ti−3Cu alloy microstructure corrosion resistance antibacterial properties

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