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Dual nanoprecipitation and nanoscale chemical heterogeneity in a secondary hardening steel for ultrahigh strength and large uniform elongation

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Journal of Materials science & technology 2024年第18期185卷 245-258页

作者： Shidong Wang Jinhua Wang Shijie Zhang Daixiu Wei Yang Chen Xuequan Rong Wu Gong Stefanus Harjo Xiaochun Liu Zengbao Jiao Zhigang Yang Gang Sha Chunxu Wang Guang Chen Hao Chen Key Laboratory for Advanced Materials of Ministry of Education School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China School of Materials Science and Engineering/Herbert Gleiter Institute of Nanoscience Nanjing University of Science and TechnologyNanjing 210094China National Key Laboratory of Advanced Casting Technologies MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials TechnologyEngineering Research Center of Materials Behavior and DesignMinistry of EducationNanjing University of Science and TechnologyNanjing 210094China J-PARC Center Japan Atomic Energy AgencyIbaraki 319-1195Japan Institute of Metals College of Materials Science and EngineeringChangsha University of Science&TechnologyChangsha 410114China Department of Mechanical Engineering Research Institute for Advanced ManufacturingThe Hong Kong Polytechnic UniversityHong Kong 999077China Central Iron and Steel Research Institute Beijing 100081China

Nanoprecipitates and nanoscale retained austenite(RA)with suitable stability play crucial roles in deter-mining the yield strength(YS)and ductility of ultrahigh strength steels(UHSSs).However,owing to the kinetics incompatibility between nanoprecipitation and austenite reversion,it is highly challenging to si-multaneously introduce high-density nanoprecipitates and optimized RA in *** this work,through the combination of austenite reversion treatment(ART)and subsequent flash austenitizing(FA),nanoscale chemical heterogeneity was successfully introduced into a low-cost UHSS prior to the aging *** chemical heterogeneity involved the enrichment of Mn and Ni in the austenite *** resulting UHSS exhibited dual-nanoprecipitation of Ni(Al,Mn)and(Mo,Cr)_(2)C and nanoscale austenite stabilized via Mn and Ni *** hard martensitic matrix strengthened by high-density dual-nanoprecipitates con-strains the plastic deformation of soft RA with a relatively low fraction of-15%,and the presence of relatively stable nanoscale RA with adequate Mn and Ni enrichment leads to a marginal loss in YS but keeps a persistent transformation-induced plasticity(TRIP)*** a result,the newly-developed UHSS exhibits an ultrahigh YS of-1.7 GPa,an ultimate tensile strength(UTS)of-1.8 GPa,a large uniform elongation(UE)of-8.5%,and a total elongation(TE)of-13%.The strategy of presetting chemical heterogeneity to introduce proper metastable phases before aging can be extended to other UHSSs and precipitation-hardened alloys.

关键词： Ultrahigh strength steels Dual-nanoprecipitation Austenite stability TRIP effect Phase transformation

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A new method to enhance the magnetocaloric effect in (Sc,Ti)Fe_(2) via magnetic phase separation

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Journal of Materials science & technology 2023年第16期147卷 102-111页

作者： Yuzhu Song Meng Xu Xinqi Zheng Chang Zhou Naike Shi Qingzhen Huang Shouguo Wang Yong Jiang Xianran Xing Jun Chen Beijing Advanced Innovation Center for Materials Genome Engineering Department of Physical ChemistryUniversity of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China NIST Center for Neutron Research National Institute of Standards and TechnologyGaithersburg MD20899-6102United States

Magnetic refrigeration based on the magnetocaloric effect(MCE)is a novel refrigeration technology that will replace traditional vapor-compression refrigeration in the *** in the performance of MCE materials is crucial for the development of magnetic refrigeration *** study presents a new method that enhances the MCE performance of(Sc,Ti)Fe_(2) via magnetic phase *** maximum magnetic entropy change induced by the coexistence of an in-plane ferromagnetic phase(FMab)and a canting antiferromagnetic phase(CAFM)in Sc_(0.3)Ti_(0.7)Fe_(2) is twice that found in other(Sc,Ti)Fe_(2 )***-temperature neutron diffraction experiments directly reveal that the large magnetic entropy change in Sc_(0.3)Ti_(0.7)Fe_(2) is dominated by the transformation from a highly ordered FMab state to a CAFM state with a lower magnetic *** magnetic phase separation is a direct transition from a higher-ordered state with a larger lattice to a lower-ordered state with a smaller lattice that induces a large magnetic order change and lattice *** combination of the metamagnetic transition and negative thermal expansion leads to enhanced *** study suggests the possibility that magnetic phase separation can be an effective approach to achieving and controlling a large MCE in magnetic materials.

关键词： Magnetocaloric effect Neutron diffraction Magnetic structure

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Earth's core-mantle boundary shaped by the crystallization of a hydrous terrestrial magma ocean

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National science Review 2024年第7期11卷 73-75页

作者： Qingyang Hu Jie Deng Yukai Zhuang Zhenzhong Yang Rong Huang Center for High Pressure Science and Technology Advanced Research(HPSTAR) Shanghai Advanced Research in Physical Sciences(SHARPS) Department of Geosciences Princeton University Institute of Atomic and Molecular Physics Sichuan University Key Laboratory of Polar Materials and Devices Department of Electronics East China Normal University

A water-rich global magma ocean(MO)likely existed in the early Hadean eon and subsequently cooled and *** water is an oxidant and is known to fundamentally affect liquid crystallization, the role of primordial water d... 详细信息

关键词： boundary magma earth ocean core-mantle crystallization hydrous shaped terrestrial

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Halogen makes manganese metal batteries rechargeable

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Nano research Energy 2024年第3期3卷 1-4页

作者： Dongyang Shen Mingming Wang Wei Chen Department of Applied Chemistry School of Chemistry and Materials ScienceHefei National Research Center for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei 230026China

Strong interaction between positively charged Mn2+ions and solvent molecules impedes manganese plating process,enabling previous manganese metal batteries ***,an innovative halogen-mediated strategy is revealed effect... 详细信息

关键词： halogen mediating manganese metal battery electrolyte engineering non-aqueous electrolyte manganese metal anode

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Magnetic methods in studies of new superconducting hydrides in a diamond anvil cell

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National science Review 2024年第7期11卷 16-18页

作者： Viktor V.Struzhkin Ho-kwang Mao Center for High Pressure Science&Technology Advanced Research

In recent years, we have witnessed great success in discoveries of high-transition-temperature（Tc） hydrides using high-pressure experiments. This has been achieved by creating metallic hydrogen‘alloys’ with other ... 详细信息

关键词： diamond studies cell anvil hydrides magnetic methods superconducting

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Pd–Ni–P metallic glass nanoparticles for nonenzymatic glucose sensing

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Progress in Natural science:Materials International 2023年第2期33卷 244-249页

作者： Yu Lou Zhongzheng Yao Shu Fu Sinan Liu Xindong Zhu Wen Huang Min Dong Jianrong Zeng He Lin He Zhu Si Lan Herbert Gleiter Institute of Nanoscience School of Materials Science and Engineering Nanjing University of Science and Technology Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai Institute of Applied Physics Chinese Academy of Sciences Center for Neutron Scattering City University of Hong Kong Shenzhen Research Institute

Metallic glass nanoparticles hold great promise as nonenzymatic glucose sensors due to their rich low-coordinated active sites and high biocompatibility. However,their non-periodic atomic structure and unclear structure-property relationship pose significant challenges for realizing and optimizing their sensing performance. In this work, Pd–Ni–P metallic glass nanoparticles with variable compositions were successfully prepared as nonenzymatic glucose sensors via a laser-evaporated inertgas condensation method. The electrochemical tests show that the sensor based on Pd41.25Ni41.25P17.5nanoparticles shows a wide linear detection range（0.003–1.31m M）, high sensitivity(516 μA m M-1cm-2), and high stability（～97.8% current retention after 1000 cycles）. Local structural investigations using synchrotron pair distribution function and high-resolution microscopic techniques reveal a strong structural correlation within short-to medium-range orders in the Pd41.25Ni41.25P17.5nanoparticles, which can be well retained after electrochemical cycling. These atomic-scale structural characteristics might be responsible for the high sensing performance. This study demonstrates the high applicability of Pd–Ni–P metallic glass nanoparticles as sensitive and stable non-enzymatic glucose sensors.

关键词： Nanoparticles

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A New Resonant-based Gate Driver Circuit for Crosstalk Suppression of SiC MOSFETs

A New Resonant-based Gate Driver Circuit for Crosstalk Suppr...

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2024 IEEE Transportation Electrification Conference and Expo, Asia-Pacific, ITEC Asia-Pacific 2024

作者： Parida, Nibedita Cheung, Chun-Kit Gao, Ziyang Hong Kong Applied Science And Technology Research Institute Advanced Semiconductor Integration Advanced Electronic Components And Systems Hong Kong Hong Kong

ISBN: (纸本)9798331529277

Silicon carbide (SiC) MOSFETs are now widely applicable in high power converters for ensuring high frequency operation, high power density, and high-power efficiency. At high switching frequencies, crosstalk is inevitable in one leg or bridge configuration of SiC MOSFETs based converters, where the off-state SiC MOSFET is prone to get false turn on signal, resulting in dangerous shoot-through, more severe electromagnetic interference problems, and higher losses of power converters and systems. In this paper, a new resonant based gate driver circuit, that can generate bipolar gate to source voltage (e.g., ?4V) using a unipolar auxiliary supply voltage, is proposed for mitigating the crosstalk. The proposed gate driver circuit can generate negative gate to source voltage by using the principle of series resonance circuit and possesses the advantages of easy configuration, simple control, duty cycle and switching frequency independent. Additionally, the proposed one has less power consumption as compared to the conventional solutions due to the energy recycling principle in resonant circuit. LTspice simulation has been performed and an experimental prototype has been built to preliminary validate the operating principle of the proposed solution. © 2024 IEEE.

关键词： Crosstalk

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Regulating the electromagnetic balance of materials by electron transfer for enhanced electromagnetic wave absorption

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Journal of Materials science & technology 2024年第28期195卷 63-73页

作者： Kunyao Cao Weiping Ye Yue Zhang Lewei Shen Rui Zhao Weidong Xue Xiaoyu Yang School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 610054China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing&Shenzhen Research Institute&Joint Laboratory for Marine Advanced Materials Shenzhen 518063China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and International School of Materials Science&Engineeringand School of Materials Science&EngineeringWuhan University of TechnologyWuhan 430070China School of Engineering and Applied Sciences Harvard UniversityCambridgeMassachusetts 02138United States

The fact that single dielectric loss materials have disadvantages of excessive conductivities and impedance mismatches has given rise to a large effort to develop effective strategies to fabricate electromagnetic wave(EMW)absorbing materials comprised of components that bring about a balance between dielectric loss and magnetic ***,little is known about the essential features that regulate EMW absorption *** study focused on the development of a new EMW absorbing material and gaining information about factors that govern EMW absorption *** materials at the center of the effort are light weight and porous cobalt sulfonated phthalocyanine-reduced graphene oxide(CoSPcrGO)aerogels that were synthesized by using a simple hydrothermal method followed by *** properties of these materials that contribute to the electromagnetic balance between dielectric and magnetic loss were elucidated by first formulating a reasonable hypothesis about how the relative orien-tation of the components in CoSPc-rGO govern p-conjugation and electron transfer from rGO to CoSPc,which is proposed to be a key factor contributing to the regulation of the electromagnetic *** relaxation process of materials was analyzed in detail using a variety of approaches including theoretical calculation,spectroscopic measurements,and experimental and simulation *** fabricated CoSPc-rGO aerogels that contain an ultra-low content of 4%were found to exhibit an extraordinary microwave absorption performance associated with a strong reflection loss of-53.23 dB and a broad effective absorption bandwidth of 8.04 *** results of this study should provide an effective guide for new designs of composite materials for EMW absorption.

关键词： Microwave absorption Polarization relaxation Electromagnetic balance Electrons transfer DFT calculation

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Surface restructuring Prussian blue analog-derived bimetallic CoFe phosphides by N-doped graphene quantum dots for electroactive hydrogen evolving catalyst

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Journal of Colloid and Interface science 2024年第PartA期654卷 677-687页

作者： Lin, Wei-Shiang Rinawati, Mia Huang, Wei-Hsiang Chang, Chia-Yu Chang, Ling-Yu Cheng, Yao-Sheng Chang, Ching-Cheng Chen, Jeng-Lung Su, Wei-Nien Yeh, Min-Hsin Department of Chemical Engineering National Taiwan University of Science and Technology Taipei10607 Taiwan National Synchrotron Radiation Research Center Hsinchu30076 Taiwan Graduate Institute of Applied Science and Technology National Taiwan University of Science and Technology Taipei10607 Taiwan

As a crucial stage of electrochemical water splitting, hydrogen evolution reaction (HER) favour catalyst to attain rapid kinetics for its broader application, alternating Pt in the acidic environment. Transition metal phosphides (TMPs) are one kind of earth-abundant, nonprecious-based catalyst which has been classified as a viable alternative and active for HER. While the performance remains inferior to Pt which primarily targets durability under high current density, pinpointing the reconfiguration strategy would be critical to their catalytic competency. Herein, we reported engineered N-doped graphene quantum dots (NGQD) on the surface of bimetallic CoFe phosphide (CoFeP) derived from cobalt iron Prussian blue analogue (CoFePBA) as an efficient HER. By introducing the NGQD, the surface architect and electronic state of the transition metal are altered through an adjusted electronic configuration and thus, improving the electrocatalytic activity for HER. The X-ray absorption spectroscopy (XAS) highlighting the role of NGQD, which successfully induced the electron density of Co atoms, further expedites its conductivity and electroactivity. The optimized NGQD/CoFeP substantially surpasses an overpotential of 70 mV (vs. RHE) at the current density of 10 mA cm−2 in 0.5 M H2SO4. Furthermore, the NGQD/CoFeP maintains its exceptional stability under an extremely high current density of 600 mA cm−2 after 12 h of continuous operation. Our findings show that NGQD/CoFeP might demonstrate as a viable alternative to the conventional Pt electrocatalyst in commercial water splitting for hydrogen generation. © 2023 Elsevier Inc.

关键词： Electrocatalysts

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Instrumented oscillographic study on impact toughness of an axle steel DZ2 with different tempering temperatures

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International Journal of Minerals,Metallurgy and Materials 2024年第7期31卷 1590-1598页

作者： Shuo Liu Peng Zhang Bin Wang Kaizhong Wang Zikuan Xu Fangzhong Hu Xin Bai Qiqiang Duan Zhefeng Zhang Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Technology Center Ma'anshan Iron and Steel Co.Ltd.Ma'anshan 243000China

Compared with the conventional Charpy impact test method,the oscillographic impact test can help in the behavioral analysis of materials during the fracture *** this study,the trade-off relationship between the strength and toughness of a DZ2 axle steel at various tempering temperatures and the cause of the improvement in impact toughness was *** tempering process dramatically influenced carbide precipitation behavior,which resulted in different aspect ratios of *** toughness improved along with the rise in tempering temperature mainly due to the increase in energy required in impact crack *** characteristics of the impact crack propagation process were studied through a comprehensive analysis of stress distribution,oscilloscopic impact statistics,fracture morphology,and carbide *** poor impact toughness of low-tempering-temperature specimens was attributed to the increased number of stress concentration points caused by carbide morphology in the small plastic zone during the propagation process,which resulted in a mixed distribution of brittle and ductile fractures on the fracture surface.

关键词： axle steel DZ2 tempering process impact toughness oscillographic impact test impact crack propagation carbides

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