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Microstructural evolution and its influence on mechanical and corrosion behaviors in a high-Al/Zn containing duplex Mg-Li alloy after friction stir processing

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Journal of materials science & Technology 2024年第17期184卷 245-255页

作者： Yixing Zhu Mengran Zhou Yingxin Geng Shun Zhang Tongzheng Xin Gaoqiang Chen Yifan Zhou Xiaoyu Zhou Ruizhi Wu Qingyu Shi State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China Key Laboratory for Advanced Materials Processing Technology Ministry of EducationBeijing 100084China Key Laboratory of Superlight Materials&Surface Technology(Ministry of Education) Harbin Engineering UniversityHarbin 150001China Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Beijing North Vehicle Group Corporation Beijing 100072China

Ultralight Mg-Li alloys offer promising applications across various ***-Li alloys enriched with Al and Zn hold theoretical potential for achieving excellent mechanical strength and corrosion ***,the structural and performance characteristics of such Mg-Li alloys,particularly after thermo-mechanical processing,remain inadequately explored and *** study investigated the mi-crostructural evolution of a Mg-9Li-5Al-4Zn alloy after friction stir processing and its consequent effects on the mechanical and corrosion *** grain size of the alloy was effectively refined and sta-bilized during friction stir processing at various heat *** yield strength of the alloy increased by 86.4%after friction stir processing under the highest heat input condition,which was attributed to fine grain strengthening,solid solution strengthening and dispersion ***,the alloy ex-perienced a slight decrease in elongation after the friction stir *** alloy subjected to friction stir processing with the highest heat input exhibited a minimal corrosion current density of 6.10×10^(−6) A/cm^(2),which was only 25%of the base *** enhanced anti-corrosion properties can be attributed to the dispersion and distribution of precipitated particles induced by friction stir processing,which hin-dered the micro-galvanic corrosion and promoted the generation of a compact surface film,leading to minimal and uniform *** investigation can be significant for understanding the metallurgical mechanisms and performance evolution of Mg-Li alloys during thermomechanical processes.

关键词： Mg-Li-Al-Zn alloy Friction stir processing Microstructure evolution Thermal-mechanical stability Corrosion behavior

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Failure Modes of Skull Bone of a Dog Head Under Impact Loading 12th

Failure Modes of Skull Bone of a Dog Head Under Impact Loadi...

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12th International Conference on Manufacturing engineering and Processes, ICMEP 2022

作者： Othman, Reda M. Hassan, M.A. Khierldeen, Wael M. Department of Mechanical Engineering Faculty of Engineering Assuit University Asyut71516 Egypt Materials Science and Engineering Department Egypt-Japan University of Science and Technology New Borg El Arab Egypt Industrial and Manufacturing Engineering Department Egypt-Japan University of Science and Technology New Borg El Arab Egypt

ISBN: (纸本)9789811968402

In vivo, impact test was conducted to study the failure modes of skull bone, of a dog head. The present study is based on analysis of force- displacement curves, impact velocity, fracture shape, and absorbed energy. A modified Split Hopkinson Pressure Bars (SHPB) with Poly methyl methacrylate (PMMA) bars were used to get a controllable impact trauma at three different velocity levels. Six stepped impact forces were applied on the frontal part of the dog head, while CT scan and post-mortem were performed on each tested dog after the impact test. Every tested dog was examined within no more than 15 min of impact while the load versus displacement for each tested dog is recorded and used to analyze failure and fracture mechanisms and to calculate the amount of absorbed energy during impact. Results showed that fracture propagation behavior depends on bone density, impact site, temporal muscle thickness and magnitude of the impact force. Nevertheless, the composition of the bone layers play the main role of fracture behavior versus impact load. Frontal skull bone has a combined mechanical properties because it consists of cancellous that is sandwiched between the two cortical outer layers. All three layers have different mechanical properties and resistance behavior to the impact wave. Skull fracture modes such as depressed, fisher, depressed fissure and compound elevated skull were observed and analyzed. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Computerized tomography

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Comparative evaluation based on FEA of thermal analysis of IC engine cylinder using different materials 4

Comparative evaluation based on FEA of thermal analysis of I...

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4th Innovative Product Design and Intelligent Manufacturing Systems, IPDIMS 2022

作者： Barua, Abhishek Pradhan, Swastik Kumari, Kanchan Naik, Bibekananda Priyadarshini, Manisha Choudhury, Susanta Kumar Vinayak Panicker, R. Jeet, Siddharth Department of Advanced Materials Technology CSIR-Institute of Minerals and Materials Technology Odisha Bhubaneswar India Academy of Scientific and Innovative Research Uttar Pradesh Ghaziabad India School of Mechanical Engineering Lovely Professional University Punjab Phagwara India Department of Mechanical Engineering Parala Maharaja Engineering College Odisha Berhampur India Department of Materials Engineering Indian Institute of Science Bengaluru India Department of Civil Engineering GIET University Odisha Gunupur India

Because it seals the working ends of the cylinder and houses a combustion chamber, as well as a spark plug and valves, the cylinder head is an important component of an IC engine. The heat created in the combustion chamber is very dynamic, allowing just a few microseconds to transmit the heat, which if not dispersed will cause the piston to squeeze due to overheating. As a result, excellent waste heat distribution through the cylinder body is critical to the IC engine's smooth operation. As the geometry of cylinder is problematical and the temperature within the combustion chamber is still indefinite, heat transmission through the cylinder body comprises of conduction through fins and convective heat transfer owing to surrounding air movement. Traditional heat transfer evaluation methods are quite difficult. The primary goal of this study is to examine and analyse the heat transmission of cylinder bodies constructed of various materials, including Aluminium alloy, magnesium alloy, cast iron, and stainless steel. The vehicle's speed was limited to 40 km/h, and the fin thickness was limited to 3 mm for all materials. SolidWorks is used to model the cylinder engine block with rectangular fins as well as its thermal analysis. According to thermal study results, heat dissipation is optimum in the Aluminium alloy 6061, whereas stainless steel has the least dissipation. Copyright © 2023 Elsevier Ltd. All rights reserved.

关键词： Magnesium alloys

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Wearable and interactive multicolored photochromic fiber display

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Light(science & Applications) 2024年第3期13卷 454-465页

作者： Pan Li Yuwei Wang Xiaoxian He Yuyang Cui Jingyu Ouyang Ju Ouyang Zicheng He Jiayu Hu Xiaojuan Liu Hang Wei Yu Wang Xiaoling Lu Qian Ji Xinyuan Cai Li Liu Chong Hou Ning Zhou Shaowu Pan Xiangru Wang Huamin Zhou Cheng-Wei Qiu Yan-Qing Lu Guangming Tao State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and Engineering and Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Vascular Aging(HUST) Ministry of EducationWuhan 430030China School of Optoelectronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu 611731China Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore National Laboratory of Solid State Microstructures Key Laboratory of Intelligent Optical Sensing and ManipulationCollege of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210023China School of Performing Arts Wuhan Conservatory of MusicWuhan 430060China School of Mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China School of Architecture and Urban Planning Huazhong University of Science and TechnologyWuhan 430074China School of Fashion Beijing Institute of Fashion TechnologyBeijing 100029China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Tongji Medical College Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China

Endowing flexible and adaptable fiber devices with light-emitting capabilities has the potential to revolutionize the current design philosophy of intelligent,wearable interactive ***,significant challenges remain in developing fiber devices when it comes to achieving uniform and customizable light effects while utilizing lightweight ***,we introduce a mass-produced,wearable,and interactive photochromic fiber that provides uniform multicolored light *** designed independent waveguides inside the fiber to maintain total internal reflection of light as it traverses the *** impact of excessive light leakage on the overall illuminance can be reduced by utilizing the saturable absorption effect of fluorescent materials to ensure light emission uniformity along the transmission *** addition,we coupled various fluorescent composite materials inside the fiber to achieve artificially controllable spectral radiation of multiple color systems in a single *** prepared fibers on mass-produced kilometer-long using the thermal drawing *** fibers can be directly integrated into daily wearable devices or clothing in various patterns and combined with other signal input components to control and display patterns as *** work provides a new perspective and inspiration to the existing field of fiber display interaction,paving the way for future human–machine integration.

关键词： fiber interactive colored

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Characterization of False Banana Fiber as a Potential Reinforcement Material for Geopolymer Composites 10th

Characterization of False Banana Fiber as a Potential Reinfo...

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10th EAI International Conference on Advancements of science and Technology , EAI ICAST 2022

作者： Addis, Lulseged Belay Sendekie, Zenamarkos Bantie Habtu, Nigus Gabbiye Schubert, Dirk W. Roether, Judith A. Boccaccini, Aldo R. Faculty of Chemical and Food Engineering Bahir Dar Institute of Technology Bahir Dar University Bahir Dar Ethiopia Department of Mechanical Engineering Kombolcha Institute of Technology Wollo University Kombolcha Ethiopia Institute of Biomaterials Department of Materials Science and Engineering University of Erlangen-Nuremberg Erlangen Germany Institute of Polymer Materials Department of Materials Science and Engineering University of Erlangen-Nuremberg Erlangen Germany

ISBN: (纸本)9783031336096

There is renewed interest in the use of plant-derived fibers as reinforcement material in the manufacture of composites. Replacing synthetic fiber with natural fiber has several benefits. Availability, biodegradability, lightweight, reduction of carbon footprint, and less abrasiveness in tool wear during processing are among the common benefits over synthetic fiber counterparts. The objective of this study is to investigate the physical, mechanical, thermal, and chemical properties of false banana fiber, obtained from false banana plants. The results show that the fiber has a relatively low moisture content, demonstrating that the false banana fiber has good physical properties as the moisture content of the fiber determines the dimensional stability of the produced composites. The mean diameter and true density of the fiber were found to be 173 μm and 1.483 g/cm3, respectively. A single fiber tensile test was carried out to determine the mechanical strength of the fiber. Its strength varied between 125 and 784 MPa. Based on the thermal stability test, the initial degradation of the fiber starts at 263 °C while its maximum degradation is observed at 364 °C. From the results of the chemical analysis, the fiber contains about 58.16% cellulose, 23.64% hemicellulose, and 11.12% lignin as the main components, and a small amount of extractives and ash, 4.04%, and 3.03%, respectively. Based on the overall analysis of the test results, the false banana fiber can be confirmed as one of the potential reinforcement source materials that can be used for the production of polymer composites for various applications. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Moisture

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programmable mechanical properties of additively manufactured novel steel

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International Journal of Extreme Manufacturing 2025年第1期7卷 338-355页

作者： Jinlong Su Qian Li Jie Teng Fern Lan Ng Zheling Shen Min Hao Goh Fulin Jiang Swee Leong Sing Tao Yang Chaolin Tan Singapore Institute of Manufacturing Technology(SIMTech) Agency for ScienceTechnology and Research(A∗STAR)Singapore 636732Singapore College of Materials Science and Engineering Hunan UniversityChangsha 410082People’s Republic of China Department of Materials Science and Engineering City University of Hong KongHong Kong Special Administrative Region of ChinaPeople’s Republic of China School of Materials Science&Engineering University of Science and Technology of ChinaShenyang 110016People’s Republic of China Department of Mechanical Engineering National University of SingaporeSingapore 117575Singapore

Tailoring thermal history during additive manufacturing(AM)offers a feasible approach to customise the microstructure and properties of materials without changing alloy compositions or post-heat treatment,which is generally overlooked as it is hard to achieve in commercial ***,a customised Fe-Ni-Ti-Al maraging steel with rapid precipitation kinetics offers the opportunity to leverage thermal history during AM for achieving large-range tunable strength-ductility *** Fe-Ni-Ti-Al steel was processed by laser-directed energy deposition(LDED)with different deposition strategies to tailor the thermal *** the phase transformation and in-situ formation of multi-scale secondary phases of the Fe-Ni-Ti-Al steel are sensitive to the thermal histories,the deposited steel achieved a large range of tuneable mechanical ***,the interlayer paused deposited sample exhibits superior tensile strength(∼1.54 GPa)and moderate elongation(∼8.1%),which is attributed to the formation of unique hierarchical structures and the in-situ precipitation of high-densityη-Ni_(3)(Ti,Al)during *** contrast,the substrate heating deposited sample has an excellent elongation of 19.3%together with a high tensile strength of 1.24 *** achievable mechanical property range via tailoring thermal history in the LDED-built Fe-Ni-Ti-Al steel is significantly larger than most commercial *** findings highlight the material customisation along with AM’s unique thermal history to achieve versatile mechanical performances of deposited materials,which could inspire more property or function manipulations of materials by AM process control or innovation.

关键词： additive manufacturing directed energy deposition thermal history control microstructure control mechanical property programming materials customisation in-situ precipitation

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Enhancing photostability and power conversion efficiency of organic solar cells by a “sunscreen” ternary strategy

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science China Chemistry 2023年第4期66卷 1179-1189页

作者： Yongjie Cui Zeng Chen Peipei Zhu Wei Ma Haiming Zhu Xunfan Liao Yiwang Chen State Key Laboratory for Modification of Chemical Fibers and Polymer Materials&College of Materials Science and Engineering Donghua UniversityShanghai 201620China National Engineering Research Center for Carbohydrate Synthesis/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education Jiangxi Normal UniversityNanchang 330022China Center for Chemistry of High-Performance and Novel Materials Department of ChemistryZhejiang UniversityHangzhou 310027China State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi'an 710049China

The field has witnessed the rapid growth in the power conversion efficiency(PCE)of organic solar cells(OSCs)over the past decade,reaching the threshold for practical ***,a major issue remains that OSC lifetimes are seriously limited by the ultraviolet(UV)-induced ***,inspired by the superior photostability of car paint under sunlight and ambient air,a“sunscreen”molecule,2-(2-hydroxy-5-tert-octylphenyl)benzotriazole(UV329),is used to construct the PM6:Y6 ternary *** addition of UV329 mainly enhances the ordered stacking of PM6 and increases the light utilization of blend films with the improved crystallization and appropriate phase ***,the ternary device exhibits stronger light response and obviously higher and more balanced carrier mobilities,contributing to higher short-circuit current density,fill factor and *** PCE boost is also verified in PM6:BTP-e C9 and PM6:L8-BO *** photodegradation of PM6 dominates the photo-degradation process of PM6:Y6 systems,while the UV329 can effectively suppress such degradation,and thus the ternary device can retain nearly 90%of the initial PCE under continuous illumination for 120 ***,ternary devices also preserve better thermal stability and shelf-life with the enhanced *** work provides a simple yet effective strategy for simultaneously improving PCE and photostability of OSCs.

关键词： ternary strategy sunscreen UV absorber photostability organic solar cells

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Durotaxis and Topotaxis Orchestrated Guidance on Cell Migration in 3D Printed Scaffold/Hydrogel Composite

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Additive Manufacturing Frontiers 2024年第2期3卷 224-231页

作者： Baichuan Deng Zhiwei Huang Xianglin Zhang Kai Ren Wen Feng Lu Jerry Ying Hsi Fuh Xinghuang Liu Tao Bai Bin Wu State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou310027China Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province School of Mechanical EngineeringZhejiang UniversityHangzhou310027China Department of Mechanical Engineering National University of SingaporeSingapore117575Singapore Division of Gastroenterology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430022China

Printing three-dimensional(3D)scaffolds with suitable mechanical cues is an effective strategy for guiding tissue regeneration by inducing cell migration and ***,many studies considered only one type of cue for 3D tissue engineering scaffold fabrication,such as topological cues,which is *** realize durotaxis-and topotaxis-orchestrated guidance on cell migration,a 3D printed scaffold/hydrogel composite was fabricated in this *** porous scaffold provided a topological cue(topotaxis),and the combined hydrogel provided a compliance cue(durotaxis).The results indicated that the thin fibers of the scaffold induced cell migration,and the larger pore size and directed fiber number of the scaffold led to more uniform cell orientation(topotaxis).Furthermore,when collagen was cured to cover the scaffold to result in a compliance change,the cells in the collagen still sensed the scaffold topological cue and migrated along it(durotaxis).Collagen also provides a living space and nutrition for cells,thereby significantly increasing their *** effects of durotaxis and topotaxis synthesis provide a promising solution for tissue engineering scaffold applications.

关键词： Tissue engineering scaffold Topological cue Compliance cue Cell migration

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High temperature oxidation treated 3D printed anatomical WE43 alloy scaffolds for repairing periarticular bone defects:In vitro and in vivo studies

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Bioactive materials 2024年第2期32卷 177-189页

作者： Bingchuan Liu Jinge Liu Chaoxin Wang Zhengguang Wang Shuyuan Min Caimei Wang Yufeng Zheng Peng Wen Yun Tian Department of Orthopaedics Peking University Third HospitalBeijing100191China Engineering Research Center of Bone and Joint Precision Medicine Ministry of EducationBeijing100191China The State Key Laboratory of Tribology Tsinghua UniversityBeijing100084China Department of Mechanical Engineering Tsinghua UniversityBeijing100084China Beijing AKEC Medical Co. Ltd.Beijing102200China School of Materials Science and Engineering Peking UniversityBeijing100871China

Reconstruction of subarticular bone defects is an intractable challenge in *** simultaneous repair of cancellous defects,fractures,and cartilage damage is an ideal surgical outcome.3D printed porous anatomical WE43(magnesium with 4 wt%yttrium and 3 wt%rare earths)scaffolds have many advantages for repairing such bone defects,including good biocompatibility,appropriate mechanical strength,customizable shape and structure,and *** a previous investigation,we successfully enhanced the corrosion resistance of WE43 samples via high temperature oxidation(HTO).In the present study,we explored the feasibility and effectiveness of HTO-treated 3D printed porous anatomical WE43 scaffolds for repairing the cancellous bone defects accompanied by split fractures via in vitro and in vivo *** HTO treatment,a dense oxidation layer mainly composed of Y2O3 and Nd2O3 formed on the surface of *** addition,the majority of the grains were equiaxed,with an average grain size of 7.4μ*** and rabbit experiments confirmed the non-cytotoxicity and biocompatibility of the HTO-treated WE43 *** the implantation of scaffolds inside bone defects,their porous structures could be maintained for more than 12 weeks without penetration and for more than 6 weeks with *** the postoperative follow-up period for up to 48 weeks,radiographic examinations and histological analysis revealed that abundant bone gradually regenerated along with scaffold degradation,and stable osseointegration formed between new bone and scaffold *** images further demonstrated no evidence of any obvious damage to the cartilage,ligaments,or menisci,confirming the absence of traumatic ***,finite element analysis and biomechanical tests further verified that the scaffolds was conducive to a uniform mechanical *** conclusion,applying the HTO-treated 3D printed porous anatomical WE43 scaffolds exhibited favorable repa

关键词： Periarticular bone defects 3D printing technology Magnesium alloy High temperature oxidation Osseointegration

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Scalable Arrays of Pneumatic Sensors for Multitouch Soft Skins

Scalable Arrays of Pneumatic Sensors for Multitouch Soft Ski...

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IEEE International Conference on Soft Robotics (RoboSoft)

作者： Xiaoran Zha Saurabh Jadhav Iman Adibnazari Yichen Zhai Michael T. Tolley Mechanical and Aerospace Engineering Department Materials Science and Engineering Program University of California San Diego San Diego CA USA

Soft robotic systems necessitate accurate and reliable sensor readings to detect environmental interactions and provide precise feedback for control. To be effective, soft sensors must exhibit sensitivity, reliability, repeatability, and flexibility. A versatile approach to sensing for soft robots uses soft air-filled deformable structures with pressure transducers to detect pressure changes due to applied forces. However, the common approach of employing one pressure transducer per sensing chamber limits the scalability of this sensing approach (e.g., for large arrays able to detect touch at many locations). Here we present an approach to the design of pneumatic sensor arrays that reduces the number of required transducers. We develop mathematical models to analyze the pressure variations within the sensor arrays in response to applied forces at various locations. We also introduce a method of rapidly fabricating sensor arrays by laminating elastomeric sheets patterned with laser-cut sacrificial layers. We then use our model to optimize the geometry of the sensors and evaluate the results experimentally. Finally, we devise an algorithm capable of determining the location of multiple touches anywhere within the sensor array. This work represents a step towards the practical application of soft pneumatic sensors, particularly for robotic sensing and haptic devices, enhancing the safety of human-robot interactions.

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