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Influences of Process Parameters and Addition Elements on the Fabrication of TiC-Ti3SiC2 Composites by Spark Sintering

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materials Transactions 2025年第5期66卷 608-615页

作者： Qu, Jing Matsugi, Kazuhiro Choi, Yongbum Xu, Zhefeng Yu, Jinku Department of Mechanical Materials Engineering Hiroshima University Higashihiroshima739-8527 Japan State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao066004 China

In TiC-Ti3SiC2 composites, the introduction of the TiC hard phase could improve the hardness of the Ti3SiC2 phase and prepare high hardness, high toughness and self-lubricating materials. In this study, elementary Ti, Si and graphite powders in the molar ratio of 3:1+x:2 were used as starting powders, a small amount of Al powder was added as a sintering aid, and spark sintering technology was used to sinter in the temperature range of 1373 to 1673 K at 50 MPa in vacuum. The reacted phases were identified by X-ray diffraction, and microstructure characteristics were observed. The formation mechanism of TiC-Ti3SiC2 composites was investigated based on the sintering behavior of the elemental powders during spark sintering. Pure TiC-Ti3SiC2 composites could be prepared from Ti, Si, graphite powders and Al at a molar ratio of 3:1.1:2:0.3 at 1573 K with a holding time of 0.9 ks. In conclusion, dual phase consist of TiC and Ti3SiC2 composite could be synthesized through in-situ reaction by adjusting process parameters such as sintering temperature, holding time and the content of Si and Al in element blending method. [doi:10.2320/***-MC2024008] ©2025 The Japan Institute of Metals and materials.

关键词： Titanium carbide

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Liquid Metal Containing Fiber-Reinforced Composites for Thermal Conductivity Enhancement

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Applied Composite materials 2025年 1-11页

作者： Rojas Cardenas, Angie D. Marconnet, Amy M. Davis, Chelsea S. School of Materials Engineering Purdue University West LafayetteIN47907 United States School of Mechanical Engineering Purdue University West LafayetteIN47907 United States Department of Mechanical Engineering University of Delaware NewarkDE19716 United States Department of Materials Science and Engineering University of Delaware NewarkDE19716 United States

Increasing power density and power consumption in electronic devices necessitate heat-dissipating components with high in-plane and cross-plane thermal conductivity to prevent overheating and enhance performance and reliability. Traditionally, polymer composites are made by incorporating rigid, high thermally conductive fillers within the polymer matrix. However, the filler loadings required to achieve significant thermal conductivity enhancement can impact the mechanical properties of the material system, often making them significantly more rigid or brittle than the base polymer. In this study, we developed a method to incorporate an ultra-high molecular weight polyethylene (UHMWPE) three-dimensional fiber mat and eutectic gallium indium alloy (EGaIn) liquid metal into an epoxy matrix. We integrated in-plane and cross-plane thermal conductivity measurements with flexural modulus assessments to understand the impact of the high thermal conductivity fillers on the thermal and mechanical response of the material. This approach enhances both the in-plane and cross-plane thermal conductivity of the composite, achieving thermal conductivities three times higher in the cross-plane direction and six times higher in the in-plane direction compared to the base polymer. Moreover, mechanical characterization reveals that the mechanical performance of the composite is comparable to that of a fiber-reinforced polymer composite, and the incorporation of liquid metal does not significantly impact stiffness, even at high filler loadings. This work demonstrates the potential of strategic composite design to achieve polymeric materials with optimized thermal-mechanical coupling. These new materials offer a solution to the challenges posed by higher power consumption in electronics, providing improved heat dissipation capabilities for more reliable devices. © The Author(s) 2025.

关键词： Indium alloys

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Tailoring BaCe_(0.7)Zr_(0.1)(Dy_(0.1)|Yb_(0.1))_(0.2)O_(3-δ)electrolyte through strategic Cu doping for low temperature proton conducting fuel cells:Envisioned theoretically and experimentally

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Journal of Energy Chemistry 2025年第2期101卷 692-701,I0015页

作者： Zaheer Ud Din Babar Muhammad Bilal Hanif Yan'an Li Wan-Ting Wang Hanchen Tian Cheng-Xin Li State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi'an Jiaotong UniversityXi'an 710049ShaanxiChina Department of Inorganic Chemistry Faculty of Natural SciencesComenius University Bratislava84215 BratislavaSlovakia

This study addresses the challenge of high sintering temperatures in proton-conducting fuel cells(PCFCs)with BaCeO_(3)-doped *** demonstrate that 1 mol%copper(Cu)doping at the B-site of BaCe_(0.7)Zr_(0.1)(Dy_(0.1)|Yb_(0.1))_(0.2)O_(3-δ)(BCZDYb)improves sintering behavior,enabling densification at1400℃.However,Cu doping disrupts stoichiometry,creating barium vacancies and reducing protonaccepting cations,affecting overall *** mechanism is confirmed through density functional theory(DFT)calculations and various experimental techniques,including crystal structure analysis using X-ray diffraction(XRD)and morphology and elemental analysis via field emission scanning electron microscopy(FESEM)and energy-dispersive X-ray spectroscopy(EDS).Electrochemical measurements are performed using the electrochemical impedance spectroscopy(EIS).The ionic conductivity of1 mol%Cu-doped BCZDYb(BCZDYb-1)is 1.49×10^(-2)S cm^(-1)at 650℃,which is~3.58 times higher than that of BCZDYb sintered at 1200℃.The BCZDYb-1 exhibits~16 times higher grain boundary conductivity when sintered at 1400℃,compared to undoped *** single cell employing BCZDYb-1 as the electrolyte achieved a power density of~606 mW cm^(-2)at 550℃.These results indicate that a controlled amount of Cu doping can enhance densification while maintaining high ionic co nductivity,making it suitable for practical applications in PCFCs operating at lower temperatures.

关键词： Proton conducting fuel cells(PCFCs) Sintering Densification Cu-doping Electrical conductivity BaCe_(0.7)Z_(0.1)(Dy_(0.1)/Yb_(0.1))_(0.2)O_(3-δ)(BCZDYb)

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Evolution of microstructures during isothermal annealing in hot-rolled Al-Mn alloys

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Keikinzoku/Journal of Japan Institute of Light Metals 2025年第3期75卷 137-143页

作者： Torigoe, Shoma Nakashima, Yosuke Tsuzuki, Yusho Takata, Ken Ikeda, Ken-Ichi Ii, Seiichiro Department of Mechanical Engineering Daido University 10-3 Takiharucho Minami-ku Aichi Nagoya-shi457-8530 Japan Department of Mechanical Engineering Daido University Aichi Nagoya-shi Japan Division of Materials Science and Engineering Faculty of Engineering Hokkaido University Hokkaido Sapporo-shi Japan Ibaraki Tsukuba-shi Japan

Effect of annealing in hot-rolled Al-Mn alloys on evolution of microstructures was investigated using hardness measurement, electrical-resistivity measurement, backscattered electron images, and its image analysis. Electrical resistivity with annealing time exhibited that residual content of solute Mn and Fe atoms remained in hot-rolled alloys, and that their number was decreased during annealing. Analysis of backscattering electron image of scanning electron microscopy provided that a lot of precipitates grew by consumption of such solute atoms. We considered that the growth of precipitates during isothermal annealing affect recovery and recrystallization and then hardness behavior. © 2025 The Japan Institute of Light Metals.

关键词： Manganese alloys

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Crevice corrosion of reinforcing steel in carbonated simulated concrete pore solutions contaminated by chloride

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Journal of Iron and Steel Research International 2025年第1期32卷 293-311页

作者： Peng-peng Wu Yuan-pei Gong Shao-hua Zhang Yue-zhong Zhang Bao-sheng Liu Guang-ling Song College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan030024ShanxiChina College of Chemical Engineering and Technology Taiyuan University of Science and TechnologyTaiyuan030024ShanxiChina Department of Ocean Science and Engineering Southern University of Science and TechnologyShenzhen518055GuangdongChina School of Mechanical and Mining Engineering Centre for Advanced Materials Processing and Manufacturing(AMPAM)The University of QueenslandSt LuciaQLD4072Australia State Key Laboratory of Physical Chemistry of Solid Surfaces Xiamen UniversityXiamen361005FujianChina

The crevice corrosion of the reinforcing steel in the carbonated simulated concrete pore solutions(SCPSs)containing 0.04 mol/L chloride was *** comparison,the steel without crevice covered on its surface was also *** showed that the crevice corrosion in the uncarbonated SCPS was not triggered and the steel remained passivity by suppressing the anodic dissolution in the crevice *** SCPS was carbonated to have pH values of 10.5 and 11.5,the crevice corrosion was easier to be activated than the widely reported pitting corrosion owing to the rapid oxygen depletion within the crevice,but the crevice corrosion damage might be alleviated to a certain extent due to the relative compact surface film formed inside the *** further carbonation led to the activation dissolution of both the crevice interior and exterior,causing the more serious corrosion *** process of the crevice corrosion was systematically analyzed by combining the electrochemical measurement results and Evens polarization diagram.

关键词： Crevice corrosion Reinforcing steel Carbonation Electrochemical test Rust Evens polarization diagram

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Temperature-dependent microstructural evolution in a compositionally complex solid electrolyte:The role of a grain boundary transition

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Journal of Advanced Ceramics 2025年第3期14卷 163-176页

作者： Shu-Ting Ko Chaojie Du Huiming Guo Hasti Vahidi Jenna L.Wardini Tom Lee Yi Liu Jingjing Yang Francisco Guzman Timothy J.Rupert William J.Bowman Shen J.Dillon Xiaoqing Pan Jian Luo Aiiso Yufeng Li Family Department of Chemical and Nano Engineering University of California San DiegoLa JollaCalifornia 92093USA Program in Materials Science and Engineering University of California San DiegoLa JollaCalifornia 92093USA Department of Materials Science and Engineering University of California IrvineIrvineCalifornia 92697USA Department of Physics and Astronomy University of California IrvineIrvineCalifornia 92697USA Irvine Materials Research Institute University of California IrvineIrvineCalifornia 92697USA

Compositionally complex solid electrolyte(Li_(0.375)Sr_(0.4375))(Ta_(0.375)Nb_(0.375)Zr_(0.125)Hf_(0.125))O_(3)(LSTNZH)samples are synthesized using different sintering temperatures,durations,and cooling conditions(furnace cooling(FC)*** quenching(AQ)).The temperature-dependent grain growth has been examined to investigate the microstructural evolution and the origin of exaggerated(abnormal)grain *** moderate temperatures,the grain growth of LSTNZH follows a cubic root growth model with an Arrhenius temperature *** increasing temperature,bimodal microstructures develop,and the Arrhenius temperature dependence breaks ***,increasing the temperature induces increased Nb segregation at general grain boundaries(GBs),in contrast to classical GB segregation models but suggesting premelting-like GB disordering,which can explain the observed abnormal grain growth(AGG).In addition,the large grains become faceted with increasing temperature,which occurs concurrently with the temperature-induced transitions in GB segregation and grain growth,thereby further supporting the occurrence of a GB phase-like(complexion)*** impacts on the densification,ionic conductivity,and hardness are also *** work provides a new insight into the fundamental understanding of the grain growth mechanisms of the emergent class of medium-and high-entropy compositionally complex ceramics(CCCs),which is essential for tailoring microstructures and material properties.

关键词： compositionally complex ceramics(CCCs) solid electrolytes perovskite grain growth grain boundary(GB) electron backscatter diffraction(EBSD)

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Mutual promotion on the mechanical and tribological properties of the nacre-like self-lubricant film designed for demanding green tribological applications

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Friction 2025年第3期13卷 171-185页

作者： Hongbo Ju Jing Luan Yiping Wang Andrey Bondarev Manuel Evaristo Yaoxiang Geng Junhua Xu Albano Cavaleiro Filipe Fernandes School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Department of Mechanical Engineering ARISECEMMPREUniversity of CoimbraCoimbra 3030-788Portugal TINT-Laboratory for Tribology and Interface Nanotechnology Faculty of Mechanical EngineeringUniversity of LjubljanaAškerčeva 6Ljubljana1000Slovenia School of Engineering Bernal InstituteUniversity of LimerickLimerick V94 T9PXIreland ISEP-School of Engineering Polytechnic of PortoPorto 4200-072Portugal

The inverse relationship between the tribological and mechanical properties of environmentally friendly selflubricant films,induced by the addition of soft lubricant agents that can diffuse quickly at elevated temperatures,has hindered the widespread use of these materials in industrial *** paper took this challenge to break through the above established relationship by developing novel nacrelike multilayered Mo_(2)N–SiN_(x)/Ag–SiN_(x)self-lubricant films via an radio frequency(RF)magnetron sputtering system for real applications where harsh conditions at elevated temperatures *** multilayered films,deposited by alternating deposition of Mo_(2)N–SiN_(x)and Ag–SiN_(x)modulation layers,exhibited three phases of face-centered cubic(fcc)Mo_(2)N,fcc Ag and SiN_(x),where SiN_(x)encapsulated the nano-crystalline Mo_(2)N and Ag phases in each layer to successfully induce a“brick and mortar”nacre-like microstructure(in the area without the coherent structure).The epitaxy growth of the Ag–SiN_(x)layers with thickness below 6 nm on the Mo_(2)N template resulted in an extraordinary increase in both the hardness and elastic modulus,which was able to prevent severe degradation of the mechanical properties caused by the addition of *** room-temperature anti-friction property could be enhanced by increasing the Ag–SiN_(x)layer thickness due to the excellent lubricant nature of Ag,which acts in synergy with Mo_(2)N,while the wear rate below 4×10^(−8)mm^(3)/(N·mm)was due to the high mechanical *** tribological properties at 600℃also benefited from the interlocked multilayered architecture,which allowed an extreme low friction coefficient of~0.12 and a negligible wear rate(WR).This behavior was attributed to the synergism between the lubricant action of Ag and Mo_(2)N and the tribo-phase transformation from Ag_(2)Mo_(4)O_(13)to Ag_(2)MoO_(4).

关键词： radio frequency(RF)magnetron sputtering system Mo_(2)N-SiN_(x)/Ag-SiN_(x)self-lubricant films interlocked structure epitaxial growth lubrication synergism tribo-phase transformation

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Morphable 3D architectures enabled by shear-guided approach

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materials Today 2025年 86卷 28-41页

作者： Li, Kan Liu, Zhi Hu, Xiaonan Xu, Zijian Zhou, Yunlei Chen, Lin Huang, Yonggang Bo, Renheng Zhang, Yihui AML Department of Engineering Mechanics State Key Laboratory of Flexible Electronics Technology Tsinghua University Beijing100084 China State Key Laboratory of Digital Manufacture Equipment and Technology Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi'an Jiaotong University Shaanxi Xi'an710000 China Departments of Mechanical Engineering Civil and Environmental Engineering Materials Science and Engineering and Center for Bio-Integrated Electronics Northwestern University EvanstonIL60208 United States

3D structures and electronic devices assembled through mechanically guided approaches have found important applications in a wide spectrum of emerging fields, including healthcare, biomedical engineering, wearable devices, robotics, among others. To broaden the obtainable functional 3D architectures via mechanical pathways, in this work, a shear-guided assembly approach is demonstrated. A series of structures in forms of ribbon, membrane and hybrid configurations with previously inaccessible geometrical features, such as reversible local flips and centrosymmetric charity are showcased. Finite element analysis (FEA) is performed, suggesting that such shear-induced structures are capable of reversible post-assembly shape transformation among different modes. Given the above, a facile design, consisting of two ribbon-like 3D units (dual-3D-unit design), is introduced and carefully calibrated for shear sensing. Notably, such design is capable of translating the hard-to-measure shear deformation into easily-accessed vertical displacements while insensitive to finite tensile loadings. A multifunctional arrayed electronic interface is fabricated using such dual-3D-unit design, suggesting promising potentials in human–machine interactions. © 2025 Elsevier Ltd

关键词： Shear deformation

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Artificial Intelligence-Powered materials science

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Nano-Micro Letters 2025年第6期17卷 212-241页

作者： Xiaopeng Bai Xingcai Zhang Department of Materials Science and Engineering Stanford UniversityStanfordCA 94305USA Department of Mechanical Engineering The University of Hong KongHong Kong 999077People’s Republic of China Department of Physics The Chinese University of Hong KongShatinHong Kong 999077People’s Republic of China

The advancement of materials has played a pivotal role in the advancement of human civilization,and the emergence of artificial intelligence(AI)-empowered materials science heralds a new era with substantial potential to tackle the escalating challenges related to energy,environment,and biomedical concerns in a sustainable *** exploration and development of sustainable materials are poised to assume a critical role in attaining technologically advanced solutions that are environmentally friendly,energy-efficient,and conducive to human *** review provides a comprehensive overview of the current scholarly progress in artificial intelligence-powered materials science and its cutting-edge *** anticipate that AI technology will be extensively utilized in material research and development,thereby expediting the growth and implementation of novel *** will serve as a catalyst for materials innovation,and in turn,advancements in materials innovation will further enhance the capabilities of AI and AI-powered materials *** the synergistic collaboration between AI and materials science,we stand to realize a future propelled by advanced AI-powered materials.

关键词： Artificial intelligence Machine learning Sustainable materials Data-driven materials innovation

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In-situ HRTEM observations of intermediate phase transformation in lattice reorientation in HCP rhenium

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材料科学技术（英文版） 2025年第3期206卷 15-25页

作者： Yang He Zhengwu Fang Bin Li Chongmin Wang Scott X.Mao Department of Mechanical Engineering and Materials Science University of PittsburghPittsburghPA 15261USA Department of Industrial and Manufacturing Systems Engineering Iowa State UniversityAmesIA 50011USA Environmental Molecular Sciences Laboratory Pacific Northwest National LaboratoryRichlandWashington 99352USA

In-situ high-resolution transmission electron microscopy(HRTEM)is performed to investigate the de-formation behavior of hexagonal close-packed rhenium(Re)which is compressed along the<1(1)00>*** simulations are also conducted to better understand the deformation *** types of lattice reorientation are observed during *** first type involves the reori-entation of one lattice by～90° around<11(2)0>,which is accomplished by the formation of an interme-diate face-center-cubic(FCC)phase at the *** transformation sequence can be described as{1(1)00}matrix →{111}FCC →(0001)*** the second type,a new grain is formed but does not satisfy any known twin relationship with the matrix,and an intermediate FCC phase is also *** transfor-mation sequence can be described as{1(1)01}matrix →{111｝FCC →(0001)*** responsible for the observed lattice reorientation and sequential phase transitions are analyzed by conducting lattice correspondence analyses on the simulation *** accommodation is also analyzed to explain the mechanisms for lattice reorientation and the intermediate phase *** results provide new insight into the deformation behavior of HCP metals.

关键词： Lattice reorientation Phase transformation Lattice correspondence

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