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Impact of annealing on structural and corrosion resistance properties of Ti_(20)Zr_(20)Hf_(20)Be_(20)Ni_(20)high-entropy metallic glass

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Rare Metals 2025年第1期44卷 565-580页

作者： Ke-Ran Li Pan Gong Dong-Liang Wang Cheng Zhang Hu Huang Muhammad Yasir Mao Zhang Xin-Yun Wang State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Research Institute of Huazhong University of Science and Technology in Shenzhen Shenzhen 518057China Key Laboratory of CNC Equipment Reliability Ministry of EducationSchool of Mechanical and Aerospace EngineeringJilin UniversityChangchun 130022China Department of Materials Science&Engineering Institute of Space TechnologyIslamabad 44000Pakistan

This study comprehensively investigates the effects of annealing on the structural,electrochemical properties and passivation film characteristics of Ti_(20)Zr_(20)Hf_(20)Be_(20)Ni_(20)(at%)high-entropy metallic glass(HE-MG).Subjected to various annealing temperatures,the samples were analyzed in a 3.5 wt%NaCl solution to evaluate changes in their microstructure and assess their corrosion *** reveal that the HE-MG undergoes multistage crystallization,displaying an amorphous matrix integrated with face centered cubic(FCC)and Ni_(7)Zr_(2)phases between 420 and 500℃,indicating robust thermal *** assessments identify a critical temperature threshold:Below the glass transition temperature(Tg),the HE-MG maintains excellent corrosion resistance,promoting stable passivation *** Tg,enhanced long-range atomic rearrangement during relaxation increases passivation layer defects and significantly diminishes corrosion resistance.X-ray photoelectron spectroscopy(XPS)analyses show that the primary components of the passivation layer are TiO_(2),ZrO_(2),HfO_(2)and *** annealing temperatures lead to enhanced Be and Ni content and decreased Ti,Zr and ***,high mixing entropy and significant atomic size mismatch suppress long-range atomic rearrangement and *** crystallization begins above Tg by_(20)℃,with crystalline phases evenly distributed within the matrix without drastically affecting corrosion *** investigation highlights the impact of thermal treatment on the properties of HE-MG,contributing valuable insights into optimizing their performance and applications.

关键词： High-entropy metallic glass Annealing Corrosion resistance Glass transition temperature Cluster

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Combined anisotropic and cyclic constitutive model for laser powder bed fusion fabricated aluminum alloy

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Chinese Journal of Aeronautics 2025年第1期38卷 165-184页

作者： Fei-Fan LI Jihong ZHU Weihong ZHANG Shifeng WEN Jingwen SONG Jun MA Gang FANG State IJR Center of Aerospace Design and Additive Manufacturing School of Mechanical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518063China School of Materials Science and Engineering Northwestern Polytechnical UniversityXi'an 710072China Department of Mechanical and Industrial Engineering Norwegian University of Science and TechnologyTrondheim 7491Norway State Key Laboratory of Tribology in Advanced Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China

This study presents new methods to effectively model the anisotropic yielding and hardening behavior of laser powder bed fusion fabricated aluminum alloy under both monotonic and cyclic loading *** proposed model combines the yield surface-interpolation method to accurately describe the anisotropic hardening rates in various directions,with the Chaboche kinematic hardening rule to precisely reflect the cyclic *** numerical implementation of the combined anisotropic and cyclic constitutive model,a fully implicit stress integration algorithm based on return mapping method is ***,the multiple parameters associated with the model are categorized and identified in an uncoupled *** isotropic and cyclic hardening parameters are determined by an inverse method,and the stability of the optimization outcomes is validated by applying different starting points for the ***,the back-stress effect on the identification of anisotropic parameters associated with the stress invariant-based Hill48 yield function is considered for the first *** consideration leads to an improved prediction accuracy compared to the identification of anisotropic parameters without considering back-stress *** combined anisotropic and cyclic constitutive model,along with the calibrated parameters,are proven capable of accurately reproducing the intricate deformation behavior of laser powder bed fusion fabricated AlSi10Mg.

关键词： Constitutive models Anisotropy Kinematic hardening Laser powder bed fusion Aluminum alloys

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Enhancing corrosion resistance of MAO coatings on Al alloy LY12 through in situ co-doping with zinc phosphate and cerium phosphate

Corrosion Communications

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Corrosion Communications 2025年第1期17卷 35-43页

作者： Chao Yang Tao Ying Aihui Huang Jian Huang Pinghu Chen Paul K.Chu Xiaoqin Zeng National Engineering Research Center of Light Alloy Net Forming School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming School of Materials Science and Engineering Shanghai Jiao Tong University Department of Chemistry University of Munich(LMU) College of Mechanical Engineering Key Laboratory of Hunan Province of Equipment Safety Service Technology under Extreme Environment University of South China Department of Physics Department of Materials Science&Engineering and Department of Biomedical Engineering City University of Hong Kong

Corrosion of aluminum（Al） alloys during service limits many applications. Micro-arc oxidation（MAO） coatings can enhance corrosion resistance, but porous defects in the films undermine their effectiveness. Here, by mixing a phosphate electrolyte with soluble Zn and Ce salts, zinc phosphate and cerium phosphate co-doped MAO corrosion-resistant coating is prepared on Al alloy LY12. Zinc phosphate and cerium phosphate are incorporated in situ to form an amorphous encapsulated nanocrystalline structure. During long-term corrosion, Zn2+is released and deposited as corrosion products Zn（OH）2to cover weak corrosion micro-regions in the coating. Simultaneously, Ce3+released from MAO coating co-doped with zinc phosphate/cerium phosphate forms Zn（OH）2/Ce（OH）3due to the small solubility product Kspto further enhance corrosion resistance. Compared to pristine Al alloy,corrosion potential increases from -1.306 to -0.819 VSCE, and corrosion current density decreases by 4 orders of magnitude from 2.6 × 10-6to 2.5 × 10-10A·cm-2. Co-doped MAO coating significantly enhances corrosion resistance of Al alloy LY12 and shows great potential for a wide range of applications.

关键词： Aluminum alloys Micro-arc oxidation coating Corrosion resistance Zinc phosphate Cerium phosphate

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Bio-Inspired Ionic Sensors: Transforming Natural Mechanisms into Sensory Technologies

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Nano-Micro Letters 2025年第8期17卷 67-94页

作者： Kyongtae Choi Gibeom Lee Min-Gyu Lee Hee Jae Hwang Kibeom Lee Younghoon Lee Department of Mechanical Engineering Kyung Hee University1732 Deogyeong-daeroGiheung-guYonginGyeonggi-do 17104Republic of Korea Department of Mechanical Engineering Gachon University1342 Seongnam-daeroSujeong-guSeongnamGyeonggi-do 13120Republic of Korea Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea Department of Mechanical Design Engineering Kumoh National Institute of Technology61 Daehak-roGumiGyeongsangbuk-do 39177Republic of Korea

Many natural organisms have evolved unique sensory systems over millions of years that have allowed them to detect various changes in their surrounding *** systems feature numerous receptors—such as photoreceptors,mechanoreceptors,and chemoreceptors—that detect various types of external stimuli,including light,pressure,vibration,sound,and chemical *** stimuli are converted into electrochemical signals,which are transmitted to the brain to produce the sensations of sight,touch,hearing,taste,and *** by the biological principles of sensory systems,recent advancements in electronics have led to a wide range of applications in artificial *** the current review,we highlight recent developments in artificial sensors inspired by biological sensory systems utilizing soft ionic *** versatile characteristics of these ionic materials are introduced while focusing on their mechanical and electrical *** features and working principles of natural and artificial sensing systems are investigated in terms of six categories:vision,tactile,hearing,gustatory,olfactory,and proximity ***,we explore several challenges that must be overcome while outlining future research directions in the field of soft ionic sensors.

关键词： Sensors Iontronics Soft materials Biomimetics

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Impact of Ni doping into Co2SiO4 compound: Synthesis, structural, morphological, dielectric, optical, photoluminescence, and magnetic properties

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Ceramics International 2025年第15期51卷 20839-20853页

作者： Anil Kumar, Bharat Barwar, Abhishek Barbar, Shiv K. Materials Science Laboratory Department of Physics Jai Narain Vyas University Jodhpur342005 India Department of Mechanical Engineering BITS Pilani Rajasthan India

The fabrication and characterization of orthosilicate compounds have received great interest due to their unique optical and magnetic features, and numerous fundamental and technological applications. Herein, a series of Ni doped cobalt orthosilicate compounds, Co2-xNixSiO4 (x = 0.0, 0.1, 0.3 and 0.5) were fabricated via ceramic route by sintering the processed powder at high temperatures. The powder X-ray diffraction results revealed that these compounds crystallize in the orthorhombic symmetry with crystallite size ranging from 29 to 56 nm. Fourier transform infrared and Raman spectra support the phase pure formation of these compounds in the orthorhombic structure. The micro images illustrate a wide range particle size distributions, and elemental analysis affirms the right stoichiometry of these compounds. The dielectric constant and loss angle tangent spectra over the broader frequency range of 101–109 Hz reveal the fundamental polarization and relaxation characteristics of dielectric ceramics. Frequency dependent alternating current electrical conductivity and analysis of UV–Vis reflectance spectra exhibit the wide band gap semiconducting behaviour which establish uses of these compounds in futuristic power electronic module and optoelectronic devices. The fluorescence spectra show a little shift towards the lower wavelength in the emission band by increasing the Ni concentration in the compound. Additionally, the CIE coordinates explain that the blue-violet emission from these compounds, make them useful for cutting edge luminescent devices. Magnetic characterization identified the antiferromagnetic to paramagnetic transition (TN) in these compounds, together with a decrease in TN from 50 K (x = 0.0) to 38 K (x = 0.5). The low temperature (10 K) magnetic hysteresis loops confirm the existence of strong antiferromagnetism with weak ferromagnetism. The presence of two p-type semiconductors (cobalt oxide and nickel oxide) play an important role between magnetic

关键词： Nickel oxide

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Titanium nitride nanoparticles as plasmonic nanothermometers

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Optics Express 2025年第4期33卷 6758-6770页

作者： Sarabia-Alonso, Julio Aurelio Pasos, Emmanuel Vidales Belamkar, Aishwarya Wagner, Brandon Mangolini, Lorenzo Department of Mechanical Engineering University of California Riverside 900 University Ave. RiversideCA92521 United States Materials Science and Engineering Program University of California Riverside 900 University Ave. RiversideCA92521 United States

The capability of measuring the temperature at nanometer length scales is highly desirable and useful in numerous fields such as plasmonics, biomedicine, and nanochemistry. Precise and easy-to-implement temperature measurements at these scales would enable the investigation of fundamental processes that occur, for instance, during the synthesis of nanomaterials, or the conversion of electromagnetic energy into thermal one (photothermal conversion). Here, we demonstrate that titanium nitride nanoparticles are effective nanothermometers whose temperature can be measured optically in a reliable and reproducible manner. We leverage the Raman signal from these nanomaterials to measure their temperature, and we do so in two different ways: using the phononic signature induced by the presence of native oxide and using the electronic anti-stoke Raman signal induced by the free electrons in the material. Our findings confirm that titanium nitride nanoparticles, which are already an earth-abundant, low-cost alternative to gold nanoparticles, are also a versatile tool for nanothermometry. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Titanium nitride

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Stretching Oriented Microstructures to Accelerate Rayleigh Instability During Rapid Thermal Processing for Generating Thixotropic Material

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Metallurgical and materials Transactions A: Physical Metallurgy and materials science 2025年 1-13页

作者： Jaishankar, Sathyanarayan Sairam Yao, Donggang Zhou, Jack G. School of Materials Science and Engineering Georgia Institute of Technology AtlantaGA30332 United States Department of Mechanical Engineering and Mechanics Drexel University PhiladelphiaPA19104 United States

While molten thermoplastics require high shear-rate processing to reduce viscosity for extrusion, molten metals are incompatible due to very low viscosity. Instead, we can use semi-solid alloys containing a thixotropic microstructure to achieve the desired flow behavior for extrusion. However, large globular grains can clog small nozzle openings, limiting resolution. Current methods to achieve thixotropic microstructure rely on slow globularization mechanisms, resulting in relatively large grains in the semi-solid state (> 50 μm). Processing using instability mechanisms can reduce the time required for globularization and produce smaller globules ( © The Author(s) 2025.

关键词： Rapid thermal processing

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Rapid Outgassing of Hydrophilic TiO_(2) Electrodes Achieves Long-Term Stability of Anion Exchange Membrane Water Electrolyzers

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Nano-Micro Letters 2025年第8期17卷 219-236页

作者： Shajahan Shaik Jeonghyeon Kim Mrinal Kanti Kabiraz Faraz Aziz Joon Yong Park Bhargavi Rani Anne Mengfan Li Hongwen Huang Ki Min Nam Daeseong Jo Sang-Il Choi Department of Chemistry and Green-Nano Materials Research Center Kyungpook National UniversityDaegu 41566South Korea Department of Mechanical Engineering Kyungpook National UniversityDaegu 41566South Korea Department of Chemistry and Chemistry Institute for Functional Materials Pusan National UniversityBusan 46241South Korea Department of Metallurgical and Materials Engineering National Institute of TechnologyRaipur 492010India College of Materials Science and Engineering Hunan UniversityChangsha 410082HunanPeople’s Republic of China

The state-of-the-art anion-exchange membrane water electrolyzers(AEMWEs)require highly stable electrodes for prolonged *** stability of the electrode is closely linked to the effective evacuation of H_(2) or O_(2) gas generated from electrode surface during the *** this study,we prepared a superhydrophilic electrode by depositing porous nickel–iron nanoparticles on annealed TiO_(2) nanotubes(NiFe/ATNT)for rapid outgassing of such nonpolar *** super-hydrophilic NiFe/ATNT electrode exhibited an overpotential of 235 mV at 10 mA cm^(−2) for oxygen evolution reaction in 1.0 M KOH solution,and was utilized as the anode in the AEMWE to achieve a current density of 1.67 A cm^(−2) at 1.80 *** addition,the AEMWE with NiFe/ATNT electrode,which enables effective outgassing,showed record stability for 1500 h at 0.50 A cm^(−2) under harsh temperature conditions of 80±3℃.

关键词： TiO_(2)nanotubes NiFe Super-hydrophilic electrode Oxygen evolution reaction Anion-exchange membrane water electrolyzer

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Process parameter optimization for directed laser deposition of hot work tool steel Dievar

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International Journal of Advanced Manufacturing Technology 2025年第3期138卷 1129-1142页

作者： Belsvik, Marius Aga Hansen, Vidar Department of Mechanical and Structural Engineering and Materials Science University of Stavanger Stavanger4021 Norway Kverneland Group Operations Norway as Klepp4353 Norway

Tool steel utilized in hot work applications are prone to costly and time-consuming maintenance repair due to wear generated on the tool surface from static and dynamic high temperature loading during the production processes. Traditionally, the repair is mainly done by subtractive machining of the tool profile. Implementation of an additive manufacturing technology such as directed laser deposition can greatly reduce maintenance time by targeting specifically the worn areas of the tool surface. In the presented work, a commercially available hybrid additive manufacturing and computer numerical control system is used to deposit a powdered hot work tool steel called Dievar. The central composite design is used in the experimental setup to optimize the most influential input parameters;powder feed rate, traverse speed, and laser power by analyzing single track geometry. The presented process window produced defect free parts without the need for preheating, Applying a powder feed rate of 6.5 g/min, traverse speed of 550 mm/min, and laser power of 1500 W, yielding an average as-built hardness of 610 HV0.5 while retaining the required pre-hardened properties in the heat-affected zone in the substrate, with a minor hardness reduction of 4–5% post-deposition. Additionally, the research revealed that the established boundary conditions for aspect ratio and dilution is not an absolute requirement to achieve a fully dense part without lack of fusion or cracks. Engineers working in the field of additive manufacturing may use the presented method to find optimal process parameters and qualify the implementation of directed laser deposition in their industry, avoiding a unnecessarily large selection of samples for testing and thus saving time and resources. © The Author(s) 2025.

关键词： Hot working

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Enhancing Corrosion Resistance and Antibacterial Properties of ZK60 Magnesium Alloy Using Micro-Arc Oxidation Coating Containing Nano-Zinc Oxide

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Acta Metallurgica Sinica(English Letters) 2025年第1期38卷 45-58页

作者： Jin-Xiu Li Jun-Xiu Chen M.A.Siddiqui S.K.Kolawole Yang Yang Ying Shen Jian-Ping Yang Jian-Hua Wang Xu-Ping Su Key Laboratory of Materials Surface Science and Technology of Jiangsu Province Higher Education Institutes Changzhou UniversityChangzhou213164China Department of Orthopedics and Traumatology The Chinese University of Hong KongHong Kong999077China School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing210094China Metallurgical Engineering Department NED University of Engineering and TechnologyUniversity RoadKarachiPakistan Mechanical Engineering Department School of Engineering and TechnologyFederal PolytechnicOffa P.M.B 420OffaNigeria Department of Orthopedics Changzhou Hospital of Traditional Chinese MedicineChangzhou213004China

Nano-zinc oxides(ZnO)demonstrate remarkable antibacterial *** further enhance the corrosion resistance and antibacterial efficiency of magnesium alloy micro-arc oxidation(MAO)coatings,this study investigates the preparation of ZnO-containing micro-arc oxidation coatings with dual functionality by incorporating nano-ZnO into MAO *** influence of varying ZnO concentrations on the microstructure,corrosion resistance,and antibacterial properties of the coating was examined through microstructure analysis,immersion tests,electrochemical experiments,and antibacterial *** findings revealed that the addition of nano-ZnO significantly enhanced the corrosion resistance of the MAO-coated ***,when the ZnO concentration in the electrolyte was 5 g/L,the corrosion rate was more than ten times lower compared to the MAO coatings without ***,the antibacterial efficacy of ZnO+MAO coating,prepared with a ZnO concentration of 5 g/L,surpassed 95%after 24 h of co-culturing with Staphylococcus aureus(***).The nano-ZnO+MAO-coated alloy exhibited exceptional degradation resistance,corrosion resistance,and antibacterial effectiveness.

关键词： Nano-ZnO Micro-arc oxidation(MAO)coating ZK60 alloy Corrosion behavior Antibacterial characteristics

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