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Printability,microstructures and mechanical properties of a novel Co-based superalloy fabricated via laser powder bed fusion

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Journal of materials science & Technology 2024年第22期189卷 96-109页

作者： Chuan Guo Zhen Xu Gan Li Jingchen Wang Xiaogang Hu Ying Li Xiaohan Chen Hui Liu Le Cheng Shiyu Zhong Qiang Zhu Jian Lu CityU-Shenzhen Futian Research Institute Shenzhen 518045China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Mechanical Engineering Shenyang National Laboratory for Materials ScienceGreater Bay Joint DivisionCity University of Hong KongTat Chee AvenueKowloonHong KongChina Centre for Advanced Structural Materials City University of Hong Kong Shenzhen Research InstituteGreater Bay Joint DivisionShenyang National Laboratory for Materials ScienceShenzhen 518057China

High levels of Al and Ti in superalloy compositions normally lead to cracking formation during the laser powder bed fusion process,while these elements are key constituents of strengthening *** the current study,a novel Co-based superalloy with the basic chemical composition of Co-Al-W-Ta-Ti resolved this contradiction,indicating that the part was formed without cracking and simultaneously contained a large amount of strengthening precipitates in the microstructure fabricated via laser powder bed *** printability,microstructures,and mechanical properties of the sample were analysed before and after heat treatment,providing a potential superalloy that can replace Ni-based superalloys fabricated by additive manufacturing in aerospace and other industries with higher temperature and more efficiency.

关键词： Co-based superalloy Laser powder bed fusion Printability Microstructure mechanical properties

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

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Nano-Micro Letters 2025年第08期 75-102页

作者： Kyongtae Choi Gibeom Lee Min-Gyu Lee Hee Jae Hwang Kibeom Lee Younghoon Lee Department of Mechanical Engineering Kyung Hee University Department of Mechanical Engineering Gachon University Department of Materials Science and Engineering Seoul National University Department of Mechanical Design Engineering Kumoh National Institute of Technology Department of Mechanical Engineering Gachon University1342 Seongnam-daeroSujeong-guSeongnam Department of Mechanical Engineering Kyung Hee University1732 Deogyeong-daeroGiheung-guYongin

Many natural organisms have evolved unique sensory systems over millions of years that have allowed them to detect various changes in their surrounding environments. Sensory 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 smell. Inspired by the biological principles of sensory systems, recent advancements in electronics have led to a wide range of applications in artificial sensors. In the current review,we highlight recent developments in artificial sensors inspired by biological sensory systems utilizing soft ionic materials. The versatile characteristics of these ionic materials are introduced while focusing on their mechanical and electrical properties. The features and working principles of natural and artificial sensing systems are investigated in terms of six categories: vision, tactile, hearing, gustatory, olfactory, and proximity sensing. Lastly, we explore several challenges that must be overcome while outlining future research directions in the field of soft ionic sensors.

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Design of A Novel Statically Balanced Mechanism for End-effector-type Upper Limb Assistance

Design of A Novel Statically Balanced Mechanism for End-effe...

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2025 IEEE International Conference on Mechatronics, ICM 2025

作者： Meng, Qizhi Jiang, Ming Tang, Ruijie Kuo, Chin-Hsing Ceccarelli, Marco Takeda, Yukio Institute of Science Tokyo Department of Mechanical Engineering Tokyo Japan Tsinghua University Department of Mechanical Engineering Beijing China School of Mechanical Materials Mechatronic and Biomedical Engineering University of Wollongong Australia University of Rome Tor Vergata Department of Industrial Engineering Rome Italy

ISBN: (纸本)9798331533892

Partial loss of upper limb motor function is a typical sequela of stroke. To help such patients actively cope with daily challenges and improve their quality of life, limb functional assistances play important roles. To this end, this paper proposes a three-degree-of-freedom parallel mechanism, which can be used for human upper limb assistance. The base of the proposed mechanism is a circular track that can be attached to the waist of the human body. The mechanism consists of two chains containing parallelogram linkage, which presents good constraints for the mobile platform and facilitates the static balance design by adding springs, thereby providing reliable assistive functions and lightweight portability. The mobility of the proposed mechanism is analyzed via the screw theory, and it is verified that the mechanism generates the aimed movements. Then, the kinematic analysis of the mechanism is presented. Finally, the static balance design is carried out in detail, and the spring constants of the three added springs are calculated. The result shows that the mechanism can achieve perfect static balance. The proposed mechanism is expected to provide a potential candidate for assistive devices and be developed into a prototype providing upper limb assistance. © 2025 IEEE.

关键词： End effectors

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Co single atoms and nanoparticles dispersed on N-doped carbon nanotube as high-performance catalysts for Zn-air batteries

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Rare Metals 2022年第6期41卷 2055-2062页

作者： Jing-Jing Chen Shuai Gu Rui Hao Zhen-Yu Wang Mu-Qing Li Zhi-Qiang Li Kun Liu Ke-Meng Liao Zhi-Qiang Wang He Huang Ying-Zhi Li Kai-Li Zhang Zhou-Guang Lu Department of Materials Science and Engineering Guangdong Provincial Key Laboratory of Energy Materials for Electric PowerShenzhen Key Laboratory of Interfacial Science and Engineering of MaterialsSouthern University of Science and TechnologyShenzhen 518055China Department of Mechanical Engineering City University of Hong KongHong Kong 999077China

Diminishing the size of active sites in catalysts is promis-ing to improve the kinetics of oxygen reduction reaction(ORR)and reduce the cost of metal-air ***,the facile preparation of high-performance catalysts with nanoscale active sites still suffers from great ***,we report a facile template-free strategy to fabri-cate Co single atoms and nanoparticles dispersed on porous N-doped carbon nanotube(Co-NCNT)by the pyrolysis of the composites of metal-organic complexes and porous carbon *** from the conventional strategy,the precursor metal-organic complexes in this work were prepared under mild conditions and used without complex purification *** with the pristine carbon nanotube,N-doped carbon nanotube with abundant meso-pores contribute to the formation of nanoscale Co sites.

关键词： nanoparticles composites carbon

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Direct ink writing of gradient shear-stiffening elastomer for enhanced toughness and impact resistance

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Journal of Industrial and engineering Chemistry 2025年 149卷 593-603页

作者： Gong, Liping Zhao, Chunyu Lu, Hongda Zhang, Qingtian Chen, Zexin Yang, Junjie Yang, Jinyu Sun, Shuaishuai Du, Haiping Li, Weihua School of Mechanical Materials Mechatronic and Biomedical Engineering University of Wollongong Wollongong2522 Australia CAS Key Laboratory of Mechanical Behaviour and Design of Materials Department of Modern Mechanics University of Science and Technology of China Hefei230027 China School of Electrical Computer and Telecommunication Engineering University of Wollongong Wollongong2522 Australia

Shear-stiffening materials have garnered significant attention due to their inherent ability to rapidly respond to changes in strain rate. However, conventional studies on these materials exhibit limited mechanical performance and insufficient structural design, hindering applications in material science and smart mechatronics. Inspired by the gradient structure of a squid beak, this study uses a direct-ink-writing (DIW) technology to develop a novel gradient shear-stiffening elastomer (GSSE). Comprehensive characterizations were conducted to optimize the printability of the shear-stiffening elastomer under various testing conditions, including rheology, compression, and tension. Additionally, the toughness and impact resistance of the elastomer were systematically investigated. It is demonstrated that the biomimetic GSSE exhibits enhanced flexibility, efficient energy dissipation, and outstanding impact resistance. Consequently, this work advances the field of shear-stiffening elastomers for diverse applications by leveraging the gradient structure design strategy to achieve superior mechanical performance under complex loading conditions. © 2025 The Author(s)

关键词： Strain rate

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Does friction contribute to formability improvement using servo press?

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Friction 2023年第5期11卷 820-835页

作者： Kali PRASAD Aishwary GUPTA Hariharan KRISHNASWAMY Uday CHAKKINGAL Dilip K.BANERJEE Myoung-Gyu LEE Department of Mechanical Engineering Indian Institute of Technology MadrasChennai 600036India Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea Department of Metallurgical and Materials Engineering Indian Institute of Technology MadrasChennai 600036India Material Measurement Laboratory National Institute of Standards and Technology(NIST)Gaithersburg 20899USA

Servo press forming machines are advanced forming systems that are capable of imparting interrupted punch motion,resulting in enhanced room temperature *** exact mechanism of the formability improvement is not yet *** contribution of interrupted motion in the ductility improvement has been studied through stress relaxation phenomena in uniaxial tensile(UT)***,the reason for improved formability observed when employing servo press is complicated due to the additional contribution from frictional *** the present work,an attempt is made to decouple the friction effect on formability improvement *** improved formability is studied using a hole expansion test(HET).The limit of forming during hole expansion is modeled using the Hosford–Coulomb(HC)damage criteria,which is implemented as a user subroutine in a commercial explicit finite element(FE)*** the contribution of stress relaxation is accounted for in the evolution of the damage variable during interrupted ***,the difference between simulation and experimental hole expansion ratio(HER)can be used to decouple the friction effect from the overall formability improvement during hole *** improvement in HER due to stress relaxation and friction effect is *** study showed that the model effectively captures the hole expansion deformation process in both monotonic and interrupted loading *** to stress relaxation,friction effect played a major role during interrupted HET.

关键词： servo press hole expansion test(HET) dual phase steel finite element(FE)analysis Hosford-Coulomb(HC)ductile fracture model

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Macroporous Directed and Interconnected Carbon Architectures Endow Amorphous Silicon Nanodots as Low‑Strain and Fast‑Charging Anode for Lithium‑Ion Batteries

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Nano-Micro Letters 2024年第5期16卷 333-351页

作者： Zhenwei Li Meisheng Han Peilun Yu Junsheng Lin Jie Yu Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems Shenzhen Engineering Lab for Supercapacitor MaterialsSchool of Material Science and EngineeringHarbin Institute of TechnologyShenzhenUniversity TownShenzhen 518055People’s Republic of China Songshan Lake Materials Laboratory Dongguan Dongguan 523808GuangdongPeople’s Republic of China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055People’s Republic of China

Fabricating low-strain and fast-charging silicon-carbon composite anodes is highly desired but remains a huge challenge for lithium-ion ***,we report a unique silicon-carbon composite fabricated by uniformly dis-persing amorphous Si nanodots(SiNDs)in carbon nanospheres(SiNDs/C)that are welded on the wall of the macroporous carbon framework(MPCF)by vertical graphene(VG),labeled as MPCF@VG@SiNDs/*** high dispersity and amor-phous features of ultrasmall SiNDs(~0.7 nm),the flexible and directed electron/Li+transport channels of VG,and the MPCF impart the MPCF@VG@SiNDs/C more lithium storage sites,rapid Li+transport path,and unique low-strain property during Li+***,the MPCF@VG@SiNDs/C exhibits high cycle stability(1301.4 mAh g^(-1) at 1 A g^(-1) after 1000 cycles without apparent decay)and high rate capacity(910.3 mAh g^(-1),20 A g^(-1))in half cells based on industrial electrode *** assembled pouch full cell delivers a high energy density(1694.0 Wh L^(-1);602.8 Wh kg^(-1))and an excellent fast-charging capability(498.5 Wh kg^(-1),charging for 16.8 min at 3 C).This study opens new possibilities for preparing advanced silicon-carbon com-posite anodes for practical applications.

关键词： Amorphous Si nanodots Low-strain Fast-charging Lithium-ion batteries

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Impact of zinc oxide nanoparticles on the mechanical properties of coir fiber reinforced composites for sustainable development

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Interactions 2024年第1期245卷 1-10页

作者： Mohanavel, Vinayagam Kannan, Sathish Raja, Thandavamoorthy Kulandaivel, Arul Ganesh, Nagaraja Soudagar, Manzoore Elahi Mohammad Centre for Materials Engineering and Regenerative Medicine Bharath Institute of Higher Education and Research Tamil Nadu Selaiyur Chennai600073 India Department of Mechanical Engineering Chandigarh University Punjab Mohali140413 India Department of Mechanical Engineering Amity University Dubai345019 United Arab Emirates Materials Science Lab Department of Prosthodontics Saveetha Dental College and Hospitals SIMATS Saveetha University Chennai India Department of Mechanical Engineering Agni College of Technology Tamil Nadu Chennai600130 India Department of Mechanical Engineering Madurai Institute of Engineering and Technology Tamil Nadu Pottapalayam Sivagangai District India Dehradun Uttarakhand248002 India

Last few decades the light weight polymer composites play a key role in engineering applications. In recent days Polymer composites gain more attention nowadays than the conventional materials and nanomaterials-based polymer composites reveal better functionalities than traditional materials. The size of the filler is found to influence the mechanical strength of the composites. In this present study composite samples were prepared with 30 weight% Cocosnucifera fibers in epoxy matrix due to that higher fiber content can impair composite quality like increased viscosity and poor fiber dispersion. The effect of adding different weight% of Zinc oxide nanoparticles (0.5, 1, 1.5 and 2wt %) on the mechanical properties of the composites were investigated. The size of the ZnO particles was between 30 and 50 nm. Studies conducted revealed that the addition of ZnO nanoparticles produced an increase in the mechanical properties of the composites. Optimum mechanical strength was obtained for the composites with 1.5wt% addition of ZnO in the matrix. Scanning electron microscopic studies revealed that failure was due to fiber breakage, pullouts and higher nanoparticle loading produced lack of enough interfacial adhesion between fiber and matrix. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2024.

关键词： ZnO nanoparticles

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Machine learning potential assisted exploration of complex defect potential energy surfaces

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npj Computational materials 2024年第1期10卷 3017-3023页

作者： Chao Jiang Chris A.Marianetti Marat Khafizov David H.Hurley Computational Mechanics and Materials Department Idaho National LaboratoryIdaho FallsID 83415USA Department of Applied Physics and Applied Mathematics Columbia UniversityNew YorkNY 10027USA Department of Mechanical and Aerospace Engineering The Ohio State UniversityColumbusOH 43210USA Materials Science and Engineering Department Idaho National LaboratoryIdaho FallsID 83415USA

Atomic-scale defects generated in materials under both equilibrium and irradiation conditions can significantly impact their physical and mechanical *** the energetically most favorable ground-state configurations of these defects is an important step towards the fundamental understanding of their influence on the performance of materials ranging from photovoltaics to advanced nuclear ***,using fluorite-structured thorium dioxide(ThO_(2))as an exemplar,we demonstrate how density functional theory and machine learning interatomic potential can be synergistically combined into a powerful tool that enables exhaustive exploration of the large configuration spaces of small point defect *** study leads to several unexpected discoveries,including defect polymorphism and ground-state structures that defy our physical *** physical origins of these unexpected findings are elucidated using a local cluster expansion model developed in this work.

关键词： properties defect potential

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Fabrication and Characterization of Silicon Carbide and Graphite Reinforced Aluminium Matrix Composite

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Journal of The Institution of Engineers (India): Series D 2023年第2期104卷 587-601页

作者： Chatterjee, Arpita Sen, Soumyadeep Paul, Subhodeep Ghosh, Kunal Ghosh, Manojit Sutradhar, Goutam Department of Mechanical Engineering Dr. Sudhir Chandra Sur Institute of Technology and Sports Complex Kolkata India Department of Mechanical Engineering National Institute of Technology Manipur Manipur India Department of Metallurgy and Materials Engineering Indian Institute of Engineering Science and Technology Shibpur Howrah India Ghaziabad201002 India Materials Processing and Microsystems Laboratory CSIR- Central Mechanical Engineering Research Institute Durgapur713209 India

Fabrication of Aluminium-based metal matrix composites has proved to be one of the most promising alternatives to the conventional alloying methodologies in recent times for manufacturing lightweight materials with high strength bearing capacities. Apart from possessing appreciable mechanical properties, these fabricated composites are also expected to withstand significant wear resistance for various applications in extreme conditions. Braking pads can be considered as one of such applications which demand the material to be extremely resistant to high abrasion even at elevated temperatures. Hence the use of composites on such occasions is not uncommon. Owing to the significant increment in strength and toughness from the addition of SiC and the elevation of wear resistance by virtue of self-lubricating nature of graphite, they have proved to be the top choice for reinforcements. The present study deals with the fabrication and characterization of SiC and graphite-reinforced Aluminium LM6 alloys for their implementation as the primary constituent material in braking systems. Hence, the tribological analysis, comprising of estimation of the coefficient of friction, specific wear rate and wear track analysis of the fabricated composite, can be considered as the primary findings of the present study. The results indicated the ability of graphite to impart significant wear resistance at elevated temperatures. Employing the well-known stir casting methodology for fabrication purposes can also be considered as one of the highlights of the current investigation. The accurate assessment of mechanical properties was obtained through hardness, tensile and compression tests. Further, optical microscopy, electron diffraction spectroscopy and XRD analysis are presented with an aim to bridge the gap between theoretical expectations and experimental results. All the results were observed to be in good agreement with each other indicating the influence of SiC and Graphite reinforc

关键词： Wear resistance

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