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Anticorrosion and discharge performance of calcium and neodymium co-doped AZ61 alloy anodes for Mg-air batteries

Journal of materials science & Technology 2024年第26期193卷 132-145页

作者： Baosheng Liu Ang Gao Zhechao Zhang Muhun He Ben Bin Xu Xuetao Shi Pengpeng Wu Sijie Guo Mohammed A.Amin Eman Ramadan Elsharkawy Zhanhu Guo School of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Department of Mechanical and Civil Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle Upon Tyne NE18STUK Department of Chemistry College of ScienceTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Department of Chemistry Faculty of ScienceNorthern Border UniversityArarSaudi Arabia

Calcium(Ca)and neodymium(Nd)were introduced in the AZ61 alloy as alloying *** microstructure,corrosion behavior,and discharge properties of AZ61-1Nd-xCa(x=0,0.5 wt.%,1 wt.%,2 wt.%)alloys as anodes for Mg-air batteries were systematically *** results indicated that the AZ61-1Nd-1Ca alloy exhibits the best corrosion resistance during electrochemical experiments and hydrogen evolution *** performance tests showed that the AZ61-1Nd-1Ca alloy exhibits the best specific capacity(1193.6 mAh g^(-1)),energy density(1893.7 mWh g^(-1)),anode efficiency(60.3%),and cell voltage(1.246 V)at higher current *** is mainly attributed to the addition of Ca element,which refines the grain size of the alloy and increases the grain boundary *** addition,Al_(2)Nd and Al_(2)Ca phases have similar corrosion mechanisms in the cross-section of the extruded *** precipitated granular Al_(2)Ca phase is uniformly dispersed on the substrate and acts as a physical *** not only enhances the corrosion resistance of the alloy but also improves the anode efficiency of the alloy during discharge.

关键词： Mg alloy Ca addition Mg-air battery Corrosion behavior Discharge performance

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Microstructure and properties of as-cast Zr-2.5Nb-1X(X=Ru,Mo,Ta and Si) alloys for biomedical application

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Rare Metals 2023年第10期42卷 3497-3509页

作者： Xi-Nu Tan Fei-Tao Li Yu-Shun Liu Ri-Sheng Qiu Qing Liu Electron Microscopy Center College of Materials Science and EngineeringChongqing UniversityChongqing400044China International Joint Laboratory for Light Alloys(MOE) College of Materials Science and EngineeringChongqing UniversityChongqing400044China TU Ilmenau Chair Materials for Electrical Engineering and ElectronicsInstitute of Materials Science and Engineering and Institute of Micro-and Nanotechnologies MacroNanoIlmenau98693Germany Department of Mechanical Engineering University of ManitobaWinnipegMBR3T 5V6Canada Key Laboratory for Light-Weight Materials Nanjing Tech UniversityNanjing210009China

The micro structure and properties of as-cast Zr-2.5Nb-1X(X=Ru,Mo,Ta and Si) alloy are screened to explore novel biomedical zirconium alloys for magnetic resonance *** micro structure and phase transformation were characterized using X-ray diffraction(XRD),scanning electron microscope(SEM)and transmission electron microscope(TEM).Hardness test,magnetic detection and electrochemical corrosion measurements are taken to present *** results show that all alloys consist of α-Zr,β-Zr and ω-Zr.α-Zr and β-Zr mainly exist in the form of parallel and intersecting plates,and nanoscale ω-Zr is dispersed in β-Zr ***,blocky ω-Zr with needle-like α-Zr is only found in plate-free blocks of Zr-2.5Nb-1Mo/Ru *** orientation relationship(OR) between α-Zr and ω-Zr follows [1120]_α//[1101]_ω and(0001)_α//([1011]_ω 011)_ω.Combining this OR with the OR between β-Zr and ω-Zr,the transformation relationship between β-Zr/ω-Zr and α-Zr is also ***-2.5Nb-1Ru alloy with high corrosion potential(-0.500 V),low corrosion rate(0.949 μm·year^(-1)) and low magnetic susceptibility(92×10^(-6)) shows great potential to be a novel biomedical implant with magnetic resonance imaging *** on the experimental results,the possible relationship among alloying elements,micro structure and properties has been established in these Zr-2.5Nb-1X alloys.

关键词： Zirconium alloy Microstructure Phase transformation Electrochemical corrosion Magnetic susceptibility

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Ceramicized NASICON-based solid-state electrolytes for lithium metal batteries

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Journal of Solid State Electrochemistry 2024年第7期28卷 2047-2057页

作者： Tsai, Yung-Chun Ku, Meng-Chiao Hsieh, Chien-Te Sung, Po-Yu Chen, Pin-Shuan Mohanty, Debabrata Gandomi, Yasser Ashraf Hung, I-Ming Patra, Jagabandhu Chang, Jeng-Kuei Department of Chemical Engineering and Materials Science Yuan Ze University Taoyuan32003 Taiwan Department of Mechanical Biomedical Engineering University of Tennessee KnoxvilleTN37996 United States Department of Chemical Engineering Massachusetts Institute of Technology CambridgeMA02142 United States Research Center National Cheng Kung University Tainan70101 Taiwan Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsinchu30010 Taiwan

In this work, we have developed ceramicized hybrid solid state electrolytes (SSEs), which consisted of poly (vinylidene fluoride-hexafluoro propylene) (PVDF-HFP), lithium bis (trifluoromethanesulfonyl)imide (LiTFSI) salt, and sodium superionic conductor (NASICON)-type Li1+xAlxTi2‒x(PO4)3 (LATP) powders for lithium-ion batteries (LIBs) utilizing lithium metal anode. Adopting the sol–gel synthesis technique followed by a thermal calcination at 850 °C, we synthesized round-like LATP powders with an average particle size of ~ 30 μm. engineering the LATP content (~ 45 wt.%) within the hybrid SSEs, we were able to achieve thermal stability along with superior ionic conductivity (i.e., 1.40 × 10−4 S cm−1 at 30 °C). Employing the Arrhenius plot in the temperature range of 30‒70 °C, the activation energy for the ionic conduction was lowered significantly (i.e., 0.21 eV) compared to prior efforts reported in the literature (i.e., 0.27 − 0.35 eV). The application of highly optimized SSE within a LIB with lithium metal anode resulted in the maximal capacity of ~ 162 mAh g−1 at 0.1 C. The cyclic performance of the battery utilizing such an optimized SSE configuration was very robust with a highly stable coulombic efficiency (~ 96.7%) after 100 cycles. Indeed, the ceramicized LATP-based SSEs developed in this work, can be employed for boosting the ionic conductivity, specific capacity, and cycle life while mitigating the interfacial resistance of the electrolyte/electrode layer for LIBs with lithium metal anode. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2023.

关键词： Activation energy

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Indentation of a Plate on a Thin Transversely Isotropic Elastic Layer

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Acta Mechanica Solida Sinica 2025年第2期38卷 331-340页

作者： Juyao Li Guozheng Zhang Liu Wang Zhaohe Dai State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering ScienceCollege of EngineeringPeking UniversityBeijing100871China CAS Key Laboratory of Mechanical Behaviour and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei230026AnhuiChina State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of ScienceBeijing100190China

This work investigates the indentation response of an elastic plate resting upon a thin,transversely isotropic elastic layer supported by a rigid *** a scenario is encountered across a range of length scales from piezoresistive tests on graphite nanoflakes to the bending of floating ice shelves atop seabed,where the elastic layer commonly exhibits certain *** first develop an approximate model to describe the elastic response of a transversely isotropic layer by exploiting the slenderness of the *** show that this approximate model can be reduced to the classic compressible Winkler foundation model as the elastic constants of the layer are set *** then investigate the combined response of an elastic plate on the transversely isotropic elastic *** by the simplicity of our proposed approximate model,we can derive simple analytical solutions for the cases of small and large indenter *** analytical results agree well with numerical calculations obtained via finite element methods,as long as the system is sufficiently slender in a mechanical *** results offer quantitative insights into the mechanical behavior of numerous semiconductor materials characterized by transverse isotropy and employed with slender geometries in various practical applications where the thin layer works as conductive and functional layers.

关键词： Indentation Elastic layers-Transversely isotropic Winkler foundation Graphite

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Theoretical regulating the M-site composition of Janus MXenes enables the tailoring design for highly active bifunctional ORR/OER catalysts

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Journal of materials science & Technology 2024年第32期199卷 145-155页

作者： Shuang Luo Ninggui Ma Jun Zhao Yuhang Wang Yaqin Zhang Yu Xiong Jun Fan Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China Department of Mechanical Engineering City University of Hong KongHong Kong 999077China Center for Advanced Nuclear Safety and Sustainable Development City University of Hong Kong 999077Hong KongChina

Rechargeable metal-air batteries generally require efficient,durable,and safe bifunctional electrocatalysts to simultaneously support oxygen reduction/evolution reactions(ORR/OER).Herein,we employed first-principles calculations to explore the structure-activity relationship between the composition control of metal atoms and the catalytic activity of Pt-doped Ti_(2-x) Mn_(x) CO_(2) single-atom catalysts(SACs).The research found a clear linear relationship between the proportion of Mn and bifunctional performance,which can effectively modulate catalytic ***,it shows excellent bifunctional catalytic activity at medium concentrations,among which the catalyst of Pt-V_(O)-Ti_(0.89) Mn_(1.11) CO_(2) displays the lowest overpo-tential(η^(ORR/OER)=0.26/0.28 V).Attributed to the modulation of the average magnetism of Mn and the d-band center of Pt by different com ponents,the bonding strength of the active center of Pt to adsorption intermediates is changed,resulting in the enhancement of the catalyst ***,the molecular orbital-level bonding between the active site Pt and the adsorbed intermediate OH is clarified,shedding light on the involvement of the partially occupied antibonding state of Pt’s d orbital in the activation *** research extensively explores the control of catalyst activity through composition,offering strong support for designing and optimizing highly active Janus MXene-supported SACs.

关键词： DFT Janus-MXene-based SACs Composition regulation Structure-activity

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Effects of calendering state on coupled electrochemical-mechanical performance of silicon based composite electrodes

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Green Energy and Intelligent Transportation 2024年第5期3卷 34-41页

作者： Dawei Li Hongfei Wan Jiahui Liu Hainan Jiang Yikai Wang Junqian Zhang Yuejiu Zheng School of Mechanical Engineering University of Shanghai for Science and TechnologyShanghai 200093China Department of Engineering Physics Tsinghua UniversityBeijing100084China Department of Chemical and Materials Engineering University of KentuckyLexingtonKY 40506USA Shanghai Institute of Applied Mathematics and Mechanics School of Mechanics and Engineering ScienceShanghai UniversityShanghai 200444China

The super volume changes and severe mechanical degradation have been a hindrance in the wide application of silicon based composite electrodes in commercial lithium-ion batteries(LIBs).Calendering,one procedure in producing LIBs'electrodes,is indispensable to ensure low porosity and energy ***,the repercussions of the calendering process on the physical characteristics related to the behavior of silicon(Si)based electrodes during the electrochemical reaction have not been well ***,on account of the deformation characteristic of cantilever electrodes,an in-situ technique is employed to analyze the repercussions of calendering status on the coupled electro-chemo-mechanical *** the electrochemical cycling,Young's modulus and diffusion-induced stress in composite electrodes are *** results show that the swelling strain,the stress and the modulus of the Si-based electrode and the calendering degree are positively ***,the stress induced by diffusion in the active layer tends to increase in the stage of lithiation and reverses during the delithiation *** with the SEM analysis,we conclude that the calendering process can induce larger stress,driving the formation of cracks in *** findings can help understand how the calendering process could affect the capacity dissipating and lifetime of Si based electrodes.

关键词： Calendering degree In situ measurement Coupled electro-mechan-chemical properties Si composite electrode Stress evolution

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Large eddy simulation of partially-premixed O2–H2 combustion with steam dilution in multi-cluster jet

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International Journal of Hydrogen Energy 2025年 144卷 977-991页

作者： Siahaan, Gabriele Maruli Tondi Jiang, Shan Tanahashi, Mamoru Juangsa, Firman Bagja Mechanical Engineering Undergraduate Program Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Jl Ganesha 10 Bandung40132 Indonesia Thermal Science and Engineering Research Group Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Jl Ganesha 10 Bandung40132 Indonesia Research Center for New and Renewable Energy Institut Teknologi Bandung Jl Ganesha 10 Bandung40132 Indonesia Department of Mechanical Engineering Institute of Science Tokyo 2-12-1 Ookayama Meguro-ku Tokyo152-8550 Japan

Over the past 150 years, carbon dioxide levels in the atmosphere have risen significantly, causing a rise in temperatures due to disruptions in the natural carbon cycle. One proposed solution is transitioning to non-carbon fuels like hydrogen, which requires modifications to current gas turbine systems despite its higher flame temperature and flammability than carbon-based fuels. A suggested modification involves a non-premixed multi-cluster jet configuration with steam dilution to achieve a lifted flame. Steam dilution is utilized to lower the combustion temperature due to material limitations and to achieve a high systematical efficiency, which can be achieved through the Graz Cycle system. This study employs large eddy simulation (LES) to analyze oxy-hydrogen combustion with steam dilution, focusing on flow dynamics, flame structure, and combustion behavior. The study also examines the impact of oxidizer jet angles and fuel jet velocities. Three simulations with different oxidizer jet angles and four variations of fuel jet velocity reveal that narrower oxidizer jet angles produce richer combustion regions. Larger oxidizer jet angles yield less turbulent flow but a more stable flame. In contrast, higher fuel jet velocities intensify turbulence, resulting in a more stable flame. This can occur since the combustion shifts towards stoichiometric and rich combustion region as fuel jet velocity increases. A more pronounced recirculation flow and enhanced mixing process also allow the flame to hold on to the flame anchor, which helps reach a more stable flame. The maximum heat release rates within the simulation domain are approximately 270 W and 250 W for angle and fuel jet velocity cases, respectively. © 2025 Hydrogen Energy Publications LLC

关键词： Steam

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Magnetic properties of diluted hexaferrites

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Physical Review B 2024年第1期110卷 014432-014432页

作者： Logan Sowadski Sean Anderson Cameron Lerch Julia Medvedeva Thomas Vojta Department of Physics Department of Mechanical Engineering and Materials Science

We revisit the magnetic properties of the hexagonal ferrite PbFe12−xGaxO19. Recent experiments have reported puzzling dependences of the ordering temperature and the saturation magnetization on the Ga concentration x. To explain these observations, we perform large-scale Monte Carlo simulations, focusing on the effects of an unequal distribution of the Ga impurities over the five distinct Fe sublattices. Ab initio density-functional calculations predict that the Ga ions preferably occupy the 12k sublattice and (to a lesser extent) the 2a sublattice. We incorporate this insight into a nonuniform model of the Ga distribution. Monte Carlo simulations using this model lead to an excellent agreement between the theoretical and experimental values of the ordering temperature and saturation magnetization, indicating that the unequal distribution of the Ga impurities is the main reason for the unusual magnetic properties of PbFe12−xGaxO19. We also compute the temperature and concentration dependences of the sublattice magnetizations, and we study the character of the zero-temperature transition that takes place when the ordering temperature is tuned to zero.

关键词： Magnetic order Magnetic phase transitions Percolation Ferrimagnets Monte Carlo methods

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Multi-scale inhomogeneity and anomalous mechanical response of nanoscale metallic glass pillar by cryogenic thermal cycling

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Rare Metals 2024年第12期43卷 6771-6780页

作者： Xiao Liu Si-Yi Di Jing Zhou Fang Miao Hong-Ze Wang Yi Wu Hao-Wei Wang Hai-Bo Ke Qiang Li Xinjiang Key Laboratory of Solid State Physics and Devices Urumqi830046China School of Physics Science and Technology Xinjiang UniversityUrumqi830046China Songshan Lake Materials Laboratory Dongguan523808China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai200240China Department of Mechanical Engineering City University of Hong KongHong Kong999077China College of Materials Science and Engineering North University of ChinaTaiyuan030051China

The mechanical responses and structure variations of Ta_(80)Co_(20)nanoscale metallic glass(MG)film samples upon cryogenic thermal cycling(CTC)treatment were *** simultaneous improvements of strength and deformation ability bring about a super-high strength of 4.5 GPa and a large plastic strain of about 80%after CTC *** significant increase in inter-element bonding and hardness makes the activation and percolation of sheartransformation zones to be more difficult and delays theyielding event,leading to the ultra-high strength.

关键词： cycling cryogenic deformation

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Historical, Contemporary, and Future Perspectives on Fuel Qualification

Historical, Contemporary, and Future Perspectives on Fuel Qu...

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2024 Annual Conference on Transactions of the American Nuclear Society, ANS 2024

作者： Mika, Mitch Aitkaliyeva, Assel University of Florida Department of Materials Science Nuclear Engineering Program GainesvilleFL United States

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