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Effect of Free-End Torsion on the Corrosion and Mechanical Properties for Mg-3Zn-0.2Ca Alloy

Acta Metallurgica Sinica(English Letters) 2025年第1期38卷 59-70页

作者： Li-Lan Gao Jiang Ma Yan-Song Tan Xiao-Hao Sun Qi-Jun Gao De-Bao Liu Chun-Qiu Zhang Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical EngineeringTianjin University of TechnologyTianjin300384China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of TechnologyTianjin300384China School of Materials Science and Engineering Tianjin University of TechnologyTianjin300384China

Magnesium alloys with excellent degradability and biocompatibility are promising materials for biomedical implants,saving patients the burden of second ***,their mechanical properties and corrosion resistance are significantly below the requirements for implant *** study aims to improve the mechanical and corrosion resistance properties of Mg-3Zn-0.2Ca alloy by pre-torsion treatment,and find out the optimal shear *** rod-shaped Mg-3Zn-0.2Ca alloy specimens were pre-torsion treated at different torsion *** effect of free-end torsion on Mg-3Zn-0.2Ca alloy was characterized through microstructure analysis,mechanical testing,and corrosion ***-torsion treatment can refine grain and induce twins and dislocations in Mg-3Zn-0.2Ca *** surface hardness increases with the increase in torsion *** yield strength and ultimate strength initially increase and then decrease with increasing torsion angle,while ductility decreases with increasing torsion *** with a shear strain of 30%exhibit the highest tensile strength,reaching 284.78±10.62 MPa,with an elongation of 19.37±1.66%.Furthermore,they show a significant improvement in fatigue lives both before and after *** the stress amplitude is 120 MPa,the fatigue lives for specimens without pre-torsion treatment are 54,275 cycles and 4324 cycles before and after pre-corrosion,while they increased significantly to 92,015 cycles and 5050 cycles with the 30%shear strain,***,the 30%shear strain specimens show a significant reduction in corrosion *** conclusion,pre-torsion treatment can effectively modify the microstructure of Mg-3Zn-0.2Ca alloy,enhancing both mechanical properties and corrosion *** optimal shear strain for this improvement is 30%.This study provides a practical method to enhance the mechanical properties and corrosion resistance of Mg-3Zn-0.2Ca alloy,making it more suitable for biomedical implan

关键词： Magnesium alloy Pre-torsion Microstructure Mechanical property Corrosion resistance

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Microstructure and mechanical properties of high-pressure sintered B6O-SiC nanocomposites

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材料科学技术（英文版） 2025年第1期204卷 238-244页

作者： Bin Zhang Rongxin Sun Pan Ying Song Zhao Yitong Zou Lei Sun Zihe Li Yufei Gao Mengdong Ma Lingyu Liu Chao Liu Bo Xu Center for High Pressure Science(CHiPS) State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China 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 Education Nanjing University of Science and TechnologyNanjing 210094China Key Laboratory of Materials and Surface Technology(Ministry of Education) School of Materials Science and EngineeringXihua UniversityChengdu 610039China School of Materials Science and Engineering Faculty of Materials Metallurgy and ChemistryJiangxi University of Science and TechnologyGanzhou 341000China

Boron suboxide(B6O)is recognized as a superhard material with a low mass density,high resistance to chemical wear,and excellent wear *** its desirable properties,the limited fracture tough-ness of B6O restricts its application in industrial *** study presents the structural and me-chanical characterization of B6O-SiC nanocomposites,which were synthesized via a high-pressure high-temperature sintering process of B6O powders and SiC *** sintering process induced fragmen-tation of SiC whiskers,resulting in the homogenous distribution of SiC fragments within the B6O *** increase in SiC content was observed to decrease the composite's hardness,while initially reducing then enhancing its *** nanocomposites containing 20 wt％and 30 wt％SiC whiskers exhibited significant improvements in fracture toughness,averaging 6.5 MPa m1/2 and 7.0 MPa m1/2,respectively-approximately threefold the toughness of polycrystalline B6O-while sustaining high hardness values of 36.3 GPa and 35.6 GPa on *** analyses revealed that the composites'superior me-chanical performance is due to the presence of strong grain boundaries,as well as a high density of nan-otwins and stacking *** findings demonstrate a viable method for producing B6O-based nanocom-posites with enhanced hardness and toughness,potentially expanding their industrial applicability.

关键词： B6O Ceramic nanocomposite Mechanical properties Microstructure

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Nanoparticle Distribution in Compression Ignition Engines Using Rapeseed Methyl Ester

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Energy Engineering 2025年第4期122卷 1249-1264页

作者： Hayder A.Dhahad Miqdam T.Chaichan Mohammed A.Fayad Hasanain A.Abdul Wahhab T.Magrites Mechanical Engineering Department University of Technology-IraqBaghdad10001Iraq Energy and Renewable Energies Technology Centre University of Technology-IraqBaghdad10001Iraq Training andWorkshop Center University of Technology-IraqBaghdad10001Iraq Centre for Advanced Powertrain and Fuels Research School of Engineering and Design Brunel UniversityLondonUB 83PHUK

One of the most important of these emissions is fine particulate matter,which is a harmful emission of diesel engines,leading to the imposition of strict ***,with its high oxygen content,is an effective alternative to significantly reduce these *** this study,rapeseed methyl ester(RME)was used as a diesel engine fuel and the emitted particulate matter was comparedwith ultra-lowsulfur diesel(ULSD).Inmost experimental studies,the emission of soot *** this work,the effects of injection timing,injection pressure(IP),and engine load on fine particulate matter in both nucleation and accumulation modes were *** results show that IP increases the number of particles in the accumulation mode while the number of particles in the crystallization mode is higher for rapeseed methyl ester(RME)than for ultra-low sulfur diesel(ULSD).Conversely,the formation rates of particles in the accumulationmode are higher for *** concentration numbers(CCN)are generally higher for RME in crystallization mode but higher for ULSD in accumulation *** the IP reduces the CCN *** particle size in crystallizationmode reaches a maximum of 22 nm at IPs of 800 and 1000 bar but decreases to 15 nm at 1200 *** fine particles fall in the 5–100 nm diameter *** engine loads reduce the particle size distribution in nucleationmode for both fuels,with a slight increase in particle size in *** concluded that the use of rapeseed methyl ester as an engine fuel benefits the environment and improves air quality due to the significant reduction in the size,number,and concentration of nano-soot particles and total particles emitted from the engine.

关键词： Injection pressure injection timing nucleation and accumulation particulate matter premixed burn smoke number

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Massive GaN micro-LED array based underwater wireless optical communication

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Optics Express 2025年第9期33卷 19527-19534页

作者： Lv, Zhijian Liu, Xinyi Wu, Shuang Zhang, Wenwei Yue, C. Patrick Liu, Zhaojun Sino-German College of Intelligent Manufacturing Shenzhen Technology University Shenzhen China Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen China State Key Laboratory of Advanced Displays and Optoelectronics Technologies The Integrated Circuit Design Center Department of Electronic and Computer Engineering The Hong Kong University of Science and Technology Hong Kong

High-speed underwater wireless optical communication technology is a much-needed communication technology in current underwater applications, and micro-LED is a promising light source option. Considering the limitation of transmission distance due to the low optical power of a single micro-LED pixel, an underwater wireless optical communication system based on a novel massive GaN micro-LED array includes more than 5000 pixels fabricated via flip-chip technology is proposed, which can achieve 165-Mbps and 90-Mbps at 37.7 m and 73.5 m, respectively. Therefore, the feasibility of realizing a high data rate and long transmission distance in an underwater wireless optical communication system based on a novel massive micro-LED array is confirmed. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Fiber to the x

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Mesoporous WO3-Dot-Decorated Flexible Electrodes for the Determination of Industrial Pollutants

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Energy & Environmental Materials 2025年第2期8卷 277-287页

作者： Aneesh Koyappayil Hyunho Seok Gwan Hyun Choi Sachin Chavan Sangho Yeon Sihoon Son Anna Go Jinhyoung Lee Keon-Woo Kim Dongho Lee Hyun-Bin Choi Hyeong-U Kim Jin Kon Kim Taesung Kim Min-Ho Lee School of Integrative Engineering Chung-Ang University SKKU Advanced Institute of Nanotechnology (SAINT) Sungkyunkwan University Materials Architecturing Research Center Korea Institute of Science and Technology (KIST) School of Mechanical Engineering Sungkyunkwan University National Creative Research Initiative Center for Hybrid Nano Materials by High-level Architectural Design of Block Copolymer Pohang University of Science and Technology (POSTECH) Department of Semiconductor Convergence Engineering Sungkyunkwan University Semicondcutor Manufacturing Research Center Korea Institute of Machinery and Materials (KIMM) Department of Nano-Mechatronics University of Science and Technology (UST)

This study demonstrates the fabrication of mesoporous tungsten trioxide（WO3）-decorated flexible polyimide（PI） electrodes for the highly sensitive detection of catechol（CC） and hydroquinone（HQ）,two environmental ***-inorganic composite dots are formed on flexible PI electrodes using evaporation-induced self-assembly（EISA） and electrospray *** EISA process is induced by a temperature gradient during electrospray,and the heated substrate partially decomposes the organic parts etched by O2plasma,creating mesoporous *** pulse voltammetry and cyclic voltammetry demonstrate a linear correlation between analyte concentration and the electrochemical *** studies support the spontaneous adsorption of CC and HQ molecules on model *** proposed sensor shows high sensitivity,a wide linear range,and a low detection limit for both individual and simultaneous determination of CC and *** sample analysis on river water confirms practical *** WO3-decorated PI electrode presents an efficient and reliable approach for detecting these pollutants,contributing to environmental safety measures.

关键词： catechol flexible sensor hydroquinone mesoporous WO3 simultaneous determination

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Target-background feature blocks and aberrance repressed correlation filters for real-time UAV tracking

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Signal, Image and Video Processing 2025年第7期19卷 1-11页

作者： Jia, Yunwei Liu, Bo Liu, Zhenzhong Wang, Tianyang Yv, Kaiying Wang, Shuo Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin300384 China

In recent years, Unmanned Aerial Vehicle (UAV) tracking technology has been widely applied in fields such as agriculture and aviation. However, due to limitations in UAV computational resources and battery life, deep learning-based tracking algorithms are difficult to deploy directly. Therefore, efficient and robust tracking methods based on Discriminative Correlation Filters (DCF) have become the mainstream for UAV tracking. The traditional DCF method updates the model with a fixed step size, making it prone to contamination, while the boundary effect further limits its tracking capability. To address the issue of model contamination, an appearance model update and masking mechanism was designed, introducing feature confidence and overall confidence thresholds to evaluate the quality of features and images. Features and images with poor quality are masked, and the learning rate is reduced to prevent model contamination. This paper proposes the Target-Background Feature Block and Aberrance Repressed Correlation Filter (TBFBARCF), which introduces target and background regularization terms into the spatial filter to mitigate boundary effects and incorporates an aberrance repression regularization term into the temporal aberrance repressed filter to reduce response map aberrance. The two filters mutually constrain each other and are jointly trained. Experiments conducted on three challenging datasets, OTB100, UAV123, and UAVDT, demonstrate that the TBFBARCF tracker outperforms 11 other DCF-based trackers. Its average precision and average success rate reach 0.756 and 0.62, respectively, and it operates at a speed of 36.6 frames per second (FPS) on a CPU platform. © The Author(s), under exclusive licence to Springer-Verlag London Ltd., part of Springer Nature 2025.

关键词： Drones

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Exploiting a novel perturbation structure to overcome manufacturing defect and modal overlap in mode localization MEMS gyroscope

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Nonlinear Dynamics 2025年 1-30页

作者： Zhang, Kunpeng Li, Wei Hao, Shuying Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin 300384 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin 300384 China

This study presents a micro-electro-mechanical system (MEMS) gyroscope featuring an innovative perturbation structure in the perturbation stiffness induced by angular velocity is applied to a serpentine coupling beam. Considering the symmetry of the initial structure of resonators and the asymmetry in stiffness resulting from initial manufacturing defects, the dynamic characteristics in the linear regime are analyzed using the complex exponential method. By integrating the backbone curve, energy balance method, amplitude-frequency response (AFR), and bifurcation analysis, we reveal the gyroscope's dynamics, mode localization phenomenon, and sensitivity performance in the geometrically nonlinear case. Subsequently, the excitation threshold at which bifurcation occurs in the out-of-phase nonlinear normal mode (NNM) is determined. Taking the excitation voltage exceeds the bifurcation threshold, the results indicate that the mode localization due to nonlinear characteristics increases the sensitivity from 0.22 ppm/°/s to 789.4 ppm/°/s when initial manufacturing defects are not considered. Furthermore, owing to the implementation of out-of-phase dual-resonator-driven, only the out-of-phase NNM is excited and forms a mode localization phenomenon, so avoiding the phenomenon of modal overlap. Accounting for the stiffness error (± 3%) caused by initial manufacturing defects, the amplitude ratio difference sensitivity improves by 314% in the nonlinear case compared to the linear case and by 103.3% relative to the nonlinear symmetric regime. The gyroscope sensitivity escalates with the rising absolute value of the stiffness error. The novel perturbation structure design for mode localization MEMS gyroscope exploits initial stiffness errors and nonlinearity to achieve a higher sensitivity output than the initial symmetric structure. © The Author(s), under exclusive licence to Springer Nature B.V. 2025.

关键词： Manufacturing defect MEMS gyroscope Modal overlap Mode localization Nonlinear normal mode Sensitivity

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Research on Practical Teaching System of Intelligent Manufacturing Engineering: A Case Study of Major design 24

Research on Practical Teaching System of Intelligent Manufac...

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2024 International Conference on Artificial Intelligence and Future Education, AIFE 2024

作者： Yang, Lu Wu, Yining Li, Zeyu Zhang, Guobin Tian, He Tianjin Key Laboratory for Advanced Mechanical System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin China

ISBN: (纸本)9798400710650

Based on the construction requirements of the "Emerging Engineering"major in intelligent manufacturing engineering and the characteristics of interdisciplinary integration, the cultivation of high-quality interdisciplinary talents has been established as the primary objective. By coordinating multiple on-campus and off-campus resources and fostering cohesion within the entire discipline supervisor team, the "academic supervisor system"training mode has been established, and the continuous training mechanism for "undergraduate and master's"programs has been effectively developed. Additionally, school-enterprise collaborations have been implemented, and practical bases have been successfully established. With the support of the entire discipline supervisor team and the closed-loop integrated laboratory, the practical teaching system characterized by cross-integration and systematic progression has been developed at our university. By creating a step-by-step, planned, and systematic practical course system, the issues of standardization, randomization, and fragmentation within practical courses have been effectively resolved. Through the integration of project-based courses and school-enterprise co-constructed courses, students' innovative abilities are further enhanced. It then describes the design and implementation methods of major design, and analyzes its practical effects. It holds significant reference and demonstrative value for the construction of practical courses, laboratories, and the talent cultivation model of the "Emerging Engineering"major. © 2024 Copyright held by the owner/author(s).

关键词： Smart manufacturing

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Exploring Edge-Driven Collaborative Fine-Tuning Toward Customized AIGC Services

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IEEE Network 2025年第3期39卷 293-301页

作者： Zhang, Qinnan Zong, Tianqi Xiong, Zehui Sun, Pangbo Zhu, Jianming Qiu, Wangjie Zheng, Zhiming Poor, H. Vincent Beihang University Institute of Artificial Intelligence Beijing Advanced Innovation Center for Future Blockchain and Privacy Computing Zhongguancun Laboratory Beijing100191 China Singapore University of Technology and Design Information Systems Technology and Design Tampines 487372 Singapore Qingcheng.AI Ltd. Beijing100084 China Central University of Finance and Economics School of Information Beijing100081 China Princeton University Department of Electrical and Computer Engineering PrincetonNJ08544 United States

With the popularization of artificial intelligence-generated content (AIGC), the explosion of end users is spurring an unprecedented diversity in preferences. To cope with this challenge, the AIGC paradigm is shifting from cloud-driven pre-trained large models to edge-driven personalized customization models. The former are large-scale models with more than 100 billion parameters trained based on massive data, while the latter introduce heterogeneous user preferences or professional knowledge to fine-tune the former. However, such fine-tuning incurs costly resource consumption and privacy disclosure. In this paper, we offer a holistic perspective on the AIGC fine-tuning framework spanning from end user to edge to cloud. Specifically, we first investigate how to deploy an edge-driven collaborative fine-tuning task through federated learning. Then, we discuss a verifiable model consensus protocol and fairness incentive design for edge servers to participate in a collaborative learning task. In addition, a case study focuses on the medical scenario, where we develop a practical X-ray diagnostic demo through collaborative fine-tuning of a multimodal pre-training model, and the diagnostic dialogue and performance results are compared. Finally, potential research directions are identified to advance the edge-driven customized AIGC services. © 1986-2012 IEEE.

关键词： Phase change materials

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Achieving high strength and large ductility in a Cr30Co30Ni30Al5Ti5 alloy through intergranular precipitation

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Journal of Materials Science and technology 2025年 215卷 167-179页

作者： Zou, Jiawei Chen, Siyu Cheng, Pengming Ding, Jun Zhang, Chongle Zhang, Shengze Zhang, Bozhao Fu, Xiaoqian Chen, Yujie Zhao, Yuping Qi, Xu Gu, Lin Zhang, Ze Sha, Gang Yu, Qian Center of Electron Microscopy and State Key Laboratory of Silicon and Advanced Semiconductor Materials School of Materials Science and Engineering Zhejiang University Hangzhou310027 China School of Materials Science and Engineering Herbert Gleiter Institute of Nanoscience Nanjing University of Science and Technology Nanjing210094 China State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi'an Jiaotong University Xi'an710049 China Center for Alloy Innovation and Design State Key Laboratory for Mechanical Xi'an Jiaotong University Xi'an710049 China Pico Electron Microscopy Center Innovation Institute for Ocean Materials Characterization Technology Center for Advanced Studies in Precision Instruments Hainan University Haikou570228 China Beijing National Center for Electron Microscopy and Laboratory of Advanced Materials School of Materials Science and Engineering Tsinghua University Beijing100084 China

Precipitation at grain boundaries is typically not regarded as an efficient method for strengthening materials since it can induce grain boundary embrittlement, which detrimentally affects ductility. In this research, we developed a multi-principal element alloy (MPEA) with the composition Cr30Co30Ni30Al5Ti5 (at.%), incorporating both intragranular and intergranular nanoprecipitates. Utilizing multiscale, three-dimensional, and in-situ electron microscopy techniques, coupled with computational simulations, we established that intergranular nanoprecipitation in this material plays a crucial role in enhancing strength and promoting dislocation plasticity. The structure of intergranular nanoprecipitation comprises multiple phases with varying composition and structure. Despite the diversity, the crystal planes conducive to the easy glide of dislocations are well-matched, allowing for the sustained continuity of dislocation slipping across different phase structures. Simultaneously, this structure generates an undulated stress field near grain boundaries, amplifying the strengthening effect and facilitating multiple slip and cross-slip during deformation. Consequently, it promotes the proliferation and storage of dislocations. As a result, our material exhibits a yield strength of approximately 1010 MPa and an ultimate tensile strength of around 1500 MPa, accompanied by a significant fracture elongation of 41 %. Our findings illuminate the potential for harnessing intergranular nanoprecipitation to optimize the strength-ductility trade-off in MPEAs, emphasizing the strategy of leveraging complex compositions for the design of sophisticated functional microstructures. © 2024

关键词： Ductility

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