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Investigation on mechanical properties of hybrid polymer composites for automobile applications

materials Today: Proceedings 2023年 74卷 73-79页

作者： Beer Mohamed, S. Anandhavasan, S. Basheer Ahamed, S. Ajayharish, R. Barathraj, B. Hariprakash, R. Ravichandran, M. Kaviarasu, C. Department of Materials Science Central University of Tamil Nadu Thiruvarur 610005 India Department of Mechanical Engineering Arasu Engineering College Kumbakonam 612501 India Department of Mechanical Engineering K.Ramakrishnan College of Engineering Trichy 621112 India

A novel epoxy-based hybrid polymer composite was developed and the effect of hybridization on the mechanical properties was investigated. Sisal fiber, polypropylene fiber, alumina trihydrate and nano silica are used for hybridization in epoxy resin matrix via hand layup process. Hardness and impact testing were conducted as per the standards ASTM D2240 and ASTM D256 respectively. Both sisal and polypropylene fibers (5 %wt.) without fillers have improved the hardness by 5.8 % and achieved an impact strength of 68 kJ/m2. A small addition of ATH (0.5 % wt.) as filler to inherit the fire retardancy has deteriorated the mechanical properties of hybrid polymers. However, the addition of nano silica (1.5 % wt.) as another filler along with ATH, sisal and polypropylene fibers has improved the mechanical properties, i.e., hardness and impact value of the epoxy resin-based hybrid polymer by 9.4 % and 85.7 % respectively by suppressing the ATH effect in the hybridization. © 2022

关键词： Polypropylenes

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Light-Material Interactions Using Laser and Flash Sources for Energy Conversion and Storage Applications

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Nano-Micro Letters 2024年第12期16卷 468-514页

作者： Jung Hwan Park Srinivas Pattipaka Geon-Tae Hwang Minok Park Yu Mi Woo Young Bin Kim Han Eol Lee Chang Kyu Jeong Tiandong Zhang Yuho Min Kwi-Il Park Keon Jae Lee Jungho Ryu Department of Mechanical Engineering(Department of Aeronautics Mechanical and Electronic Convergence Engineering)Kumoh National Institute of Technology61Daehak-RoGumiGyeongbuk 39177Republic of Korea Department of Materials Science and Engineering Pukyong National University45Yongso-RoNam-GuBusan 48513Republic of Korea Energy Technologies Area Lawrence Berkeley National LaboratoryBerkeleyCA 94720USA Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-RoYuseong-GuDaejeon 34141Republic of Korea Division of Advanced Materials Engineering Jeonbuk National UniversityJeonju 54896JeonbukRepublic of Korea School of Electrical and Electronic Engineering Harbin University of Science and TechnologyHarbin 150080People’s Republic of China Key Laboratory of Engineering Dielectrics and Its Application Ministry of EducationHarbin University of Science and TechnologyHarbin 150080People’s Republic of China Department of Materials Science and Metallurgical Engineering Kyungpook National University80 Daehak-RoBuk-GuDaegu 41566Republic of Korea School of Materials Science and Engineering Yeungnam UniversityDaehak-RoGyeongsan-Si 38541Gyeongsangbuk-doRepublic of Korea

This review provides a comprehensive overview of the progress in light-material interactions(LMIs),focusing on lasers and flash lights for energy conversion and storage *** discuss intricate LMI parameters such as light sources,interaction time,and fluence to elucidate their importance in material *** addition,this study covers various light-induced photothermal and photochemical processes ranging from melting,crystallization,and ablation to doping and synthesis,which are essential for developing energy materials and ***,we present extensive energy conversion and storage applications demonstrated by LMI technologies,including energy harvesters,sensors,capacitors,and *** the several challenges associated with LMIs,such as complex mechanisms,and high-degrees of freedom,we believe that substantial contributions and potential for the commercialization of future energy systems can be achieved by advancing optical technologies through comprehensive academic research and multidisciplinary collaborations.

关键词： Light Light-material interaction Nanomaterials Energy conversion and storage devices

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Can orientations of directionally solidified dual-phase Al_(2)O_(3)/YAG eutectics be induced by single-phase sapphire seeds?

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Journal of materials science & Technology 2023年第11期142卷 216-224页

作者： Liangting He Xu Wang Jiaze Li Wangshuai Xiang Fuxue Yan Bailing Jiang Qiaodan Hu School of Materials Science and Engineering Xi’an University of Technology5 South Jinhua RoadXi’an 710048China Center for Advanced Structural Materials Department of Mechanical EngineeringCity University of Hong KongHong Kong 999077China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Directionally solidified dual-phase Al_(2)O_(3)/Y_(3)Al_(5)O_(12)(YAG)eutectic ceramics(DSECs)typically exhibit strong *** improve their properties,various single-phase sapphire seeds,including r-axis[1-102],m-axis[10-10],c-axis[0001],and a-axis[11-20],were used as seeds to induce the orientation of the Al_(2)O_(3)/YAG *** results showed that Al_(2)O_(3) in the eutectics could be governed by the sapphire *** YAG in each induced eutectic had a specific growth direction endowed by Al_(2)O_(3) in the asinduced eutectics or the sapphire ***,we calculated the planar lattice misfits and interfacial strain energies of four crystallographic orientation relationships based on the constructed lattice *** was elucidated the constraint of the sapphire seed caused YAG to grow following the rule of mini-mizing the interfacial strain *** revealed the reason why Al_(2)O_(3)/YAG DSECs orientation can be successfully *** results may provide a novel method for the design of high-performance eu-tectic ceramic materials.

关键词： Al_(2)O_(3)/Y_(3)Al_(5)O_(12) Directional solidification Single-phase sapphire seed Crystallographic orientation relationship Interfacial strain energy

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Surface-modified Ag@Ru-P25 for photocatalytic CO_(2) conversion with high selectivity over CH_(4) formation at the solid–gas interface

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Carbon Energy 2024年第1期6卷 182-196页

作者： Chaitanya B.Hiragond Sohag Biswas Niket SPowar Junho Lee Eunhee Gong Hwapyong Kim Hong Soo Kim Jin-Woo Jung Chang-Hee Cho Bryan M.Wong Su-Il In Department of Energy Science&Engineering Daegu Gyeongbuk Institute of Science and Technology(DGIST)DaeguRepublic of Korea Department of Chemical&Environmental Engineering Materials Science&Engineering ProgramDepartment of ChemistryDepartment of Physics&AstronomyUniversity of California-RiversideRiversideCaliforniaUSA Department of Physics and Chemistry Daegu Gyeongbuk Institute of Science and Technology(DGIST)DaeguRepublic of Korea NiceScience Corporation DaeguRepublic of Korea

Systematic optimization of the photocatalyst and investigation of the role of each component is important to maximizing catalytic activity and comprehending the photocatalytic conversion of CO_(2) reduction to solar fuels.A surface-modified Ag@Ru-P25 photocatalyst with H_(2)O_(2) treatment was designed in this study to convert CO_(2) and H_(2)O vapor into highly selective *** doping followed by Ag nanoparticles(NPs)cocatalyst deposition on P25(TiO_(2))enhances visible light absorption and charge separation,whereas H_(2)O_(2) treatment modifies the surface of the photocatalyst with hydroxyl(–OH)groups and promotes CO_(2) ***-resonance transmission electron microscopy,X-ray photoelectron spectroscopy,X-ray absorption near-edge structure,and extended X-ray absorption fine structure techniques were used to analyze the surface and chemical composition of the photocatalyst,while thermogravimetric analysis,CO_(2) adsorption isotherm,and temperature programmed desorption study were performed to examine the significance of H_(2)O_(2) treatment in increasing CO_(2) reduction *** optimized Ag1.0@Ru1.0-P25 photocatalyst performed excellent CO_(2) reduction activity into CO,CH4,and C2H6 with a~95%selectivity of CH4,where the activity was~135 times higher than that of pristine TiO_(2)(P25).For the first time,this work explored the effect of H_(2)O_(2) treatment on the photocatalyst that dramatically increases CO_(2) reduction activity.

关键词： gas-phase CO_(2) reduction H_(2)O_(2) treatment plasmonic nanoparticles solar fuel photocatalyst surface modification

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Fabrication of crack-free aluminum alloy 6061 parts using laser foil printing process

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Rapid Prototyping Journal 2024年第4期30卷 722-732页

作者： Wang, Yu-Xiang Hung, Chia-Hung Pommerenke, Hans Wu, Sung-Heng Liu, Tsai-Yun Department of Mechanical Engineering National Cheng Kung University Tainan Taiwan Department of Materials Science and Engineering Missouri University of Science and Technology RollaMO United States Department of Mechanical and Aerospace Engineering Missouri University of Science and Technology RollaMO United States Core Facility Center National Cheng Kung University Tainan Taiwan

Purpose: This paper aims to present the fabrication of 6061 aluminum alloy (AA6061) using a promising laser additive manufacturing process, called the laser-foil-printing (LFP) process. The process window of AA6061 in LFP was established to optimize process parameters for the fabrication of high strength, dense and crack-free parts even though AA6061 is challenging for laser additive manufacturing processes due to hot-cracking issues. Design/methodology/approach: The multilayers AA6061 parts were fabricated by LFP to characterize for cracks and porosity. mechanical properties of the LFP-fabricated AA6061 parts were tested using Vicker’s microhardness and tensile testes. The electron backscattered diffraction (EBSD) technique was used to reveal the grain structure and preferred orientation of AA6061 parts. Findings: The crack-free AA6061 parts with a high relative density of 99.8% were successfully fabricated using the optimal process parameters in LFP. The LFP-fabricated parts exhibited exceptional tensile strength and comparable ductility compared to AA6061 samples fabricated by conventional laser powder bed fusion (LPBF) processes. The EBSD result shows the formation of cracks was correlated with the cooling rate of the melt pool as cracks tended to develop within finer grain structures, which were formed in a shorter solidification time and higher cooling rate. Originality/value: This study presents the pioneering achievement of fabricating crack-free AA6061 parts using LFP without the necessity of preheating the substrate or mixing nanoparticles into the melt pool during the laser melting. The study includes a comprehensive examination of both the mechanical properties and grain structures, with comparisons made to parts produced through the traditional LPBF method. © 2024, Emerald Publishing Limited.

关键词： 3D printing

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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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Crafting chirality in three dimensions via a novel fabrication technique for bound states in the continuum metasurfaces

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Light(science & Applications) 2024年第3期13卷 390-392页

作者： Zaid Haddadin Anna My Nguyen Lisa V.Poulikakos Department of Electrical&Computer Engineering University of California San DiegoLa JollaCAUSA Department of Mechanical&Aerospace Engineering University of California San DiegoLa JollaCAUSA Program of Materials Science&Engineering University of California San DiegoLa JollaCAUSA

An additional deposition step was added to a multi-step electron beam lithographic fabrication process to unlock the height dimension as an accessible parameter for resonators comprising unit cells of quasi-bound stat... 详细信息

关键词： dimensions dimension intrinsic

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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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Hybrid air conditioning and seawater desalination system assisted by solar energy: thermoeconomic investigation and optimization

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Journal of engineering and Applied science 2024年第1期71卷 1-19页

作者： Yosry, Nashwa Elgendy, Essam Mostafa, Ahmed Fatouh, Mohamed Mechanical Power Engineering Department Faculty of Engineering at El-Mattaria Helwan University Cairo Egypt Mechanical Engineering Department College of Engineering & ampTechnology at Arab Academy for Science Technology & ampMaritime Transport Sheraton Cairo Egypt Energy and Renewable Energy Engineering Program Faculty of Engineering and Technology Egyptian Chinese University Ain Shams Egypt

The demand for freshwater has become progressively critical due to population growth and water scarcity. The current work investigates the energetic performance of a hybrid absorption refrigeration and desalination system. A parametric study for the system operating conditions has been performed to get the optimal conditions. Also, economic analysis and a multi-objective optimization method are used with the aim of maximizing the energy utilization factor of the system and minimizing total costs. The specific cost of desalinated water from the multi-objective optimization is calculated as (1.728 Cent/L) with the greatest energy utilization factor of (2.214). It turns out that, the system performs optimum at condensation and generation temperatures of 30 and 65 °C respectively, with resultant COP and GOR of 0.84 and 1.37. Using the optimum conditions, TRNSYS has been used to investigate the transient performance of the system for Marsa–Matrouh City in Egypt. The cooling and freshwater demands are 10 kW and 24 L/h. It was concluded that the input energy required to run the hybrid system decreased by about 65% less than that required for separate systems. With the assistance of solar energy, it became clear that the energy required was 60% less than the hybrid system as well. © The Author(s) 2024.

关键词： Hybrid systems

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A combined experimental and crystal plasticity study of grain size effects in magnesium alloys

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Journal of Magnesium and Alloys 2023年第12期11卷 4445-4467页

作者： Aaditya Lakshmanan Mohsen Taheri Andani Mohammadreza Yaghoobi John Allison Amit Misra Veera Sundararaghavan Department of Aerospace Engineering University of MichiganAnn ArborMI48105USA Department of Materials Science and Engineering University of MichiganAnn ArborMI48105USA Department of Mechanical Engineering University of MichiganAnn ArborMI48105USA

This work presents a method to incorporate the micro Hall-Petch equation into the crystal plasticity finite element(CPFE) framework accounting for the microstructural features to understand the coupling between grain size, texture, and loading direction in magnesium *** effect of grain size and texture is accounted for by modifying the slip resistances of individual basal and prismatic systems based on the micro Hall-Petch equation. The modification based on the micro Hall-Petch equation endows every slip system at each microstructural point with a slip system-level grain size and maximum compatibility factor, which are in turn used to modify the slip resistance. While the slip-system level grain size is a measure of the grain size, the maximum compatibility factor encodes the effect of the grain boundary on the slip system resistance modification and is computed based on the Luster-Morris factor. The model is calibrated using experimental stress-strain curves of Mg-4Al samples with three different grain sizes from which the Hall-Petch coefficients are extracted and compared with Hall-Petch coefficients predicted using original parameters from previous work. The predictability of the model is then evaluated for a Mg-4Al sample with different texture and three grain sizes subjected to loading in different directions. The calibrated parameters are then used for some parametric studies to investigate the variation of Hall-Petch slope for different degrees of simulated spread in basal texture,variation of Hall-Petch slope with loading direction relative to basal poles for a microstructure with strong basal texture, and variation of yield strength with change in grain morphology. The proposed approach to incorporate the micro Hall-Petch equation into the CPFE framework provides a foundation to quantitatively model more complicated scenarios of coupling between grain size, texture and loading direction in the plasticity of Mg alloys.

关键词： Hall-Petch Crystal plasticity Grain size Texture Magnesium alloys

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