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Accelerated grain boundary relaxation via low temperature thermal cycling

Journal of materials science & Technology 2026年 241卷 68-77页

作者： Linlin Fu Qi Zhu Zengyan Wei Jing Qiao Gaohui Wu Huajian Gao School of Material Science and Engineering Harbin Institute of Technology Harbin 150001 China School of Mechanical and Aerospace Engineering College of Engineering Nanyang Technological University 639798 Singapore Mechano-X Institute Applied Mechanics Laboratory Department of Engineering Mechanics Tsinghua University Beijing 100084 China

Grain boundaries (GB) can exhibit multiple phases with distinct atomic structures, significantly impacting the physical and mechanical properties of materials. Under external stimuli, transitions between different GB phases frequently occur, yet the underlying atomistic mechanism remains insufficiently understood. Here, using molecular dynamics simulation, we uncover an accelerated GB relaxation mechanism through metastable-to-equilibrium GB phase transition induced by thermal cycling in aluminum. In the [100] symmetrical tilt GB, thermal cycling between 200 and 400 K accelerates the split-kite to normal-kite phase transition. This phase transition is driven by the hydrostatic stress-induced formation of localized vacancies and the immediate insertion of nearby atoms at the GB, distinguishing it from the conventional transition mechanism involving long-range atomic diffusion in isothermal annealing process. The kinetics of GB phase transitions is systematically investigated, clarifying their dependence on critical thermal cycling parameters, including maximum temperature T max , thermal amplitude Δ T , and cyclic number N . A saturated transition ratio of approximately 30% is also observed through thermal cycling, which exceeds that after isothermal annealing, leading to enhanced GB mobility.

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Superb strength−ductility synergy in Si added metastable high-entropy alloys at cryogenic temperature via reinforced TRIP effect

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Transactions of Nonferrous Metals Society of China 2025年第3期35卷 872-887页

作者： Zhan-jiang LI Yi-xi HOU Li CHEN Qing-xin CHEN Jun-feng CHEN Fa CHANG Pin-qiang DAI Qun-hua TANG College of Materials Science and Engineering Fuzhou UniversityFuzhou 350116China College of Materials Science and Engineering Fujian University of TechnologyFuzhou 350118China Fujian Provincial Key Laboratory of New Material Preparation and Forming Technology Fuzhou 350118China Beijing Key Laboratory of Microstructure and Property of Advanced Materials Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China School of Mechanical&Electrical Engineering Putian UniversityPutian 351100China

The tensile behavior of(Fe_(50)Mn_(30)Co_(10)Cr_(10))_(100-x)Si_(x)(x=0(Si0),2(Si2))metastable HEAs prepared by selective laser melting was studied at cryogenic *** results demonstrate that the addition of Si leads to lattice distortion and a decrease in stacking fault energy,especially at 77 K,which significantly promotes transformation-induced plasticity(TRIP)in Si2 *** yield strength,tensile strength,and ductility of Si2 HEAs are 505.2 MPa,1364.1 MPa,and 19%,which are 43%,53% and 58% higher than those of Si0 alloy,*** is the main deformation mode,in addition to dislocation slip,and plays a key role in *** reinforced and continuously sustained TRIP maintains a dynamic strain distribution during *** strain hardening greatly enhances the strength and ductility.

关键词： Fe_(50)Mn_(30)Co_(10)Cr_(10)HEAs selective laser melting cryogenic temperature Si addition transformation-induced plasticity(TRIP)effect

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Guanine-assisted N-doped ordered mesoporous carbons as efficient capacity decaying suppression materials for lithium–sulfur batteries

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Journal of materials science & Technology 2022年第6期101卷 155-164页

作者： Riguang Cheng Yanxun Guan Yumei Luo Chenchen Zhang Yongpeng Xia Sheng Wei Mengmeng Zhao Qi Lin Hao Li Shiyou Zheng Federico Rosei Lixian Sun Fen Xu Hongge Pan School of Material Science&Engineering Guangxi Key Laboratory of Information Materials and Guangxi Collaborative Innovation Center of Structure and Property for New Energy and MaterialsGuilin University of Electronic TechnologyGuilin 541004China School of Mechanical&Electrical Engineering Guilin University of Electronic TechnologyGuilin 541004China School of Material Science&Engineering University of Shanghai for Science&TechnologyShanghai 200093China CentreÉnergie Matériaux et TélécommunicationsInstitut National de la Recherche Scientifique1650 Boul.Lionel BouletVarennesJ3×1S2QuébecCanada School of New Energy Science and Technology Xi’an Technological UniversityChina

Lithium–sulfur(Li–S)batteries are considered promising next-generation energy storage devices due to their high weight capacities and theoretical energy densities,which are significantly higher than those of conventional lithium-ion ***,the sulfur cathode presents two major drawbacks,specifically low specific capacity caused by the poor electrical conductivities of the active materials and fast capacity decay caused by polysulfide dissolution/***,a high-rate and high-stability dendritic material consisting of N-doped ordered mesoporous carbons(NOMCs)was successfully synthesized via a facile and low-cost calcination *** highly ordered mesoporous carbon skeleton limited the growth of the sulfur nanofiller within its channels and provided the necessary electrical contact with the insulating ***,N-doped heteroatoms presented strong binding sites for trapping polysulfide intermediates,achieving high electrochemical activity,which promoted polysulfide conversion *** a result,the prepared NOMC-2/S cathode material with 1.2-1.5 mg cm^(-2)of sulfur displayed excellent electrochemical performance with a high-rate capability of 460.5 m Ah g^(-1)at 1 C,a high specific capacity of 530.9 m Ah g^(-1)after 200 cycles at 0.1 C,and a decay rate of~0.19%per cycle.

关键词： Lithium–sulfur batteries N-doped ordered mesoporous carbons Electrochemistry

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Role of Mo particles on microstructure and tribological properties of atmospheric plasma sprayed Mo reinforced BN-NiCr coatings

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Surface science and Technology 2025年第1期3卷 1-12页

作者： Xu, Jinyong Su, Hongyuan Nie, Xudong Zhang, Zicong Zhou, Yuming Dosta, Sergi Zhang, Chao College of Mechanical Engineering Yangzhou University Jiangsu Province Yangzhou P.R. China Department of Material Science and Physical Chemistry Universitat de Barcelona Barcelona Spain

Atmospheric plasma spraying was employed to prepare NB (BN-NiCr) and NM (Mo/BN-NiCr) composite coatings. The incorporation of Mo particles reduced the friction coefficient of NM coatings (0.35–0.42) compared to NB coating. However, excessive Mo content can cause particle rebound, negatively affecting friction performance. The self-lubricating properties of Mo and the layered structure of BN form a lubricating film at the friction interface, reducing the wear rate. Additionally, Mo particles enhance the NiCr coating’s strength and wear resistance. The wear mechanism transitions from adhesive to abrasive wear, with localized high temperatures during friction promoting the formation of oxide films, such as NiO, Cr2O3, and MoO3, further improving the wear resistance.

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Porous silicon on paper sensors: Factors affecting biosensing performance 17

Porous silicon on paper sensors: Factors affecting biosensin...

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Frontiers in Biological Detection: From Nanosensors to Systems XVII 2025

作者： An, Huijin Laibinis, Paul E. Locke, Andrea K. Weiss, Sharon M. Interdisciplinary Material Science Program Vanderbilt University NashvilleTN37235 United States Department of Electrical and Computer Engineering Vanderbilt University NashvilleTN37235 United States Department of Chemical and Biomolecular Engineering Vanderbilt University NashvilleTN37235 United States Department of Chemistry Vanderbilt University NashvilleTN37235 United States Department of Biomedical Engineering Vanderbilt University NashvilleTN37235 United States

ISBN: (纸本)9781510684249

A paper-based biosensor integrating a functionalized porous silicon (PSi) membrane as the active sensing element for quantifiable protein detection has been developed. For similar short-time exposures to an analyte, improved molecular transport in PSi membranes when on paper leads to larger signal changes compared to traditional PSi films that remain on a silicon substrate. In this work, we discuss controlling the incubation time of the analyte and the overall testing time of the sensor by incorporating different combinations of wicking and absorbent paper beneath the PSi membrane. With this control, the PSi-on-paper sensor platform has the potential to serve as an effective low-cost rapid diagnostic test with highly sensitive, quantitative readout for a wide range of analytes. © 2025 SPIE.

关键词： Porous silicon

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The enhanced thermoelectric properties of Pb-doped Cu2.85Ag0.15Sb0.985−xBi0.015Se4 samples synthesized via vacuum melting and cold isostatic pressing

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Ceramics International 2025年

作者： Wang, Honglei Tian, Zixuan Fu, Zhuang Zhao, Lijun Wang, Lei Dong, Songtao Ju, Hongbo School of Material Science and Engineering Jiangsu University of Science and Technology Zhenjiang212003 China Department of Mechanical Engineering University of Coimbra CEMMPRE ARISE Rua Luís Reis Santos Coimbra3030−788 Portugal Faculty of Mechanical Engineering University of Ljubljana TINT - Laboratory for Tribology and Interface Nanotechnology Aškerčeva 6 Ljubljana1000 Slovenia

Cu3SbSe4 has garnered significant attention due to its low thermal conductivity, complex elemental composition, and economic feasibility. In this study, Cu2.85Ag0.15Sb0.985−xBi0.015PbxSe4 (x = 0, 0.05, 0.10, and 0.15) samples were synthesized using a system of vacuum melting combined with cold isostatic pressing techniques. The impact of Pb doping on the thermoelectric properties of Cu2.85Ag0.15Sb0.985Bi0.015Se4 was comprehensively investigated. The experimental results revealed a notable increase in carrier concentration, from 2.95 × 1018 cm−3 to 8.31 × 1019 cm−3, leading to a substantial improvement on the electrical conductivity. At 573 K, the electrical conductivity of the Cu2.85Ag0.15Sb0.835Bi0.015Pb0.15Se4 reached 234.26 S cm−1, while the power factor of the Cu2.85Ag0.15Sb0.885Bi0.015Pb0.10Se4 achieved a maximum value of 883.5 μW m−1 K−2. The incorporation of Pb induced lattice defects, which modified the phonon mean free path and enhanced phonon scattering. As a result, the increased phonon scattering contributed to a reduction in lattice thermal conductivity within the Cu2.85Ag0.15Sb0.985Bi0.015Se4 sample. The thermoelectric figure of merit (ZT) for the Cu2.85Ag0.15Sb0.935Bi0.015Pb0.05Se4 reached a peak value of approximately 0.74 at 573 K, marking a 157.4 % improvement compared to that of Cu2.85Ag0.15Sb0.985Bi0.015Se4 (∼0.47). This study demonstrates that multi-element doping is a highly effective strategy for optimizing the thermoelectric properties of the Cu3SbSe4 system. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Germanium compounds

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Design and Optimization of the Porous Metamaterial EM Absorbers in X-band

Design and Optimization of the Porous Metamaterial EM Absorb...

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IEEE International Symposium on Electromagnetic Compatibility (EMC)

作者： Kanat Anurakparadorn Alan Taub Eric Michielssen Macromolecular Science and Engineering Program Department of Material Science and Engineering University of Michigan Ann Arbor Michigan USA Department of Mechanical Engineering University of Michigan Ann Arbor Michigan USA Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor Michigan USA

A strategy that combines experiment and simulation to design and optimize electromagnetic (EM) metamaterial absorbers containing a periodic porous structure is described. The approach provides the ability to produce absorbers that meet multiple user-specified objectives. Using the measured intrinsic properties of the baseline materials as an input to EM-field based computational modelling and optimization, absorption by the studied metamaterials measured by their reflection loss (RL) increases significantly. The resulting metamaterials have the potential for lower cost and lighter weight while providing greater protection than traditional metal gaskets and foams.

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The Application of Freeze-casting Method for Fabrication of Calcium Phosphate Biomaterials 2022

The Application of Freeze-casting Method for Fabrication of ...

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11th International Conference on Informatics, Environment, Energy and Applications, IEEA 2022

作者： Lu, Jingyi Wang, Zhongchao Song, Weihai Zhao, Zhihuan Yu, Huijun Chen, Chuanzhong Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of Education Shandong Engineering & Technology Research Center for Superhard Material School of Materials Science and Engineering Shandong University China School of Mechanical and Electronic Engineering Shandong Agricultural and Engineering University China

ISBN: (纸本)9781450395830

Freeze-casting method has been developed to generate porous calcium phosphate (CaP) biomaterials due to its simple processing routes and excellent performance of products. This paper reviews recent achievements and applications of freeze-casting CaP scaffolds for bone repairment. Specific processing routes of this method is illustrated and several influencing factors of porous structure including direction of freezing, freeze temperature and sintering parameters are summarized in details. Besides, as the most important aspect of biomaterials, the biological property of freeze-casting CaP scaffold is reviewed. We also outlook the improvement in the fabrication porous ceramics by freeze-casting method. © 2022 ACM.

关键词： Calcium phosphate

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Effect of TiO2 nanoparticles on the corrosion resistance, wear, and antibacterial properties of microarc oxidation coatings applied on AZ31 magnesium alloy

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Surface and Coatings Technology 2024年 476卷

作者： Chen, Wei Hao Huang, Shih-Yen Chu, Yu-Ren Yang, Shun-Han Cheng, I-Chung Jian, Shun-Yi Lee, Yueh-Lien Department of Engineering Science and Ocean Engineering National Taiwan University Taipei106 Taiwan Department of Mechanical Engineering National Taiwan University Taipei106 Taiwan Department of Material Engineering Ming Chi University of Technology New Taipei City24301 Taiwan

Microarc oxidation (MAO) is a surface modification process that is often adopted to produce a hard oxide layer on magnesium alloys to improve their corrosion resistance and wear resistance. However, under continual corrosion, the characteristic porous microstructure of MAO coatings provides diffusion paths that allow corrosive species to penetrate the coatings and react with the substrate underneath. Therefore, the present study investigated the modification of the microstructure of MAO coatings when adding TiO2 nanoparticles to a fluoride-containing silicate electrolyte system under the bipolar current mode. The results indicate that as the concentration of TiO2 nanoparticles increased, the quantity of rutile (TiO2) incorporated in the MAO coating increased, which led to the coating exhibiting an elevated hardness and a color change from white to gray-black. When the TiO2 concentration in the electrolyte was increased from 2.5 to 7.5 g/L, the total impedance of the MAO coating in electrochemical impedance spectroscopy analysis increased from 107 to >600 kΩcm2, which indicates that the corrosion resistance of the coating increased with the number of defects on it decreased. The addition of TiO2 enhances the photocatalytic properties of MAO coatings. However, excessive addition of TiO2 can lead to an adverse effect on the wear resistance of MAO coatings. © 2023 Elsevier B.V.

关键词： Titanium dioxide

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Toward Learning Factory for Industry 4.0: Virtual Reality (VR) for Learning Human–Robot Collaboration 1

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International Conference on Innovative Technologies in Intelligent Systems and Industrial Applications, CITISIA 2022

作者： Ariansyah, Dedy Colombo, Giorgio Pardamean, Bens Bioinformatics and Data Science Research Centre Bina Nusantara University Jakarta11480 Indonesia Department of Mechanical Engineering Politecnico di Milano Milan20156 Italy Computer Science Department BINUS Graduate Program Master of Computer Science Program Bina Nusantara University Jakarta11480 Indonesia

ISBN: (数字)9783031290787

ISBN: (纸本)9783031290770

Industry 4.0 will bring not only transformation to the manufacturing technologies but also to the profile of the workforce. Education system should be revised to prepare the future graduates embracing the knowledge of the ongoing revolution. Initiatives on the modification of curriculum and tools to deliver the concepts of Industry 4.0 must be taken. This paper examines limitations of current engineering tools and proposes a virtual reality (VR)-based learning platform to support the teaching and learning activity for Industry 4.0, focusing on the design of Human–robot Collaboration (HRC). The development process began with the identification of the general Intended Learning Outcomes (ILOs) which were extracted from the review of the HRC design issues, followed by the evaluation of the current teaching tool. From these results, the new requirements of the tools to achieve ILOs are redefined. The implementation of the system is demonstrated to show the feasibility of the proposed learning platform. This workflow can serve as initial development of another learning platform for the other innovative concepts that form the building blocks of Industry 4.0. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2023.

关键词： Industry 4.0

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