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Unraveling precipitation evolution and strengthening function of the Al-Zn-Mg-Cu alloys with various Zn contents:Multiple experiments and integrated internal-state-variable modeling

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Journal of materials science & Technology 2022年第21期116卷 130-150页

作者： Jie Tang Mingcai Liu Guowei Bo Fulin Jiang Chunhui Luo Jie Teng Dingfa Fu Hui Zhang College of Materials Science and Engineering Hunan UniversityChangsha 410082China Department of Mechanical Engineering Technical University of MunichMünchen 80333Germany Swerim AB Stockholm 16407Sweden

Zn content is one of the most concerned factors in the development of next generation ultra-strength Al-Zn-Mg-Cu alloys owing to its essential role in precipitation *** the present work,the underlying functions of Zn content in precipitation evolution and strengthening function of Al-Zn-Mg-Cu alloys were systematically investigated by combining multiple experiments and an integrated internalstate-variable *** experimental results indicated that the increased Zn content in Al-Zn-Mg-Cu alloys would promote the development of precipitates and enhance aging *** diffusion flux of soluble Zn and the coordination of Mg atom controlled the crystallographic microstructures evolution during precipitates nucleation,growth and transition *** integrating precipitation development with electrical resistivity and hardness evolutions,an improved internal-state-variable physical model was then developed for the aging responses of Al-Zn-Mg-Cu *** unified model considered the intrinsic characteristics of precipitates such as crystallographic orientation,morphology,component,and *** specific improvements were to balance the combined functions of Zn element and Mg element and consider the plate-like morphology and directed growth as indicated by *** model was also adaptive to heat-treatment variables and chemical compositions,and owned the notable advantages to simultaneously rationalize the observed microstructural characteristics,mechanical and electrical properties following artificial aging of Al-Zn-Mg-Cu *** addition,a preliminary model framework between electrical resistivity and hardness for Al-Zn-Mg-Cu alloys was established.

关键词： Al-Zn-Mg-Cu alloys Precipitation Strengthening In situ electrical resistivity Modeling

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Off-stoichiometry-guided design of high-strength chemically complex intermetallic-based alloys with outstanding ductility

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Journal of materials science & Technology 2023年第29期160卷 28-33页

作者： Bo Xiao Jixun Zhang Shaofei Liu Yilu Zhao Lianyong Xu C.T.Liu Tao Yang Department of Materials Science and Engineering Mechanical Behavior Division of Shenyang National Laboratory for Materials ScienceCity University of Hong KongHong KongChina Center for Advanced Nuclear Safety and Sustainable Development City University of Hong KongHong KongChina Hong Kong Institute for Advanced Study City University of Hong KongHong KongChina School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China School of Materials Science and Engineering Tianjin UniversityTianjin 300350China

*** The lasting drive for improved energy efficiency in power gen-eration encourages the innovative design of advanced structural materials with superb mechanical properties[1-6].Among these materials,ordered intermetallic alloys[7-9],as a unique class of metallic materials,have drawn increasing concern from both the scientific and industrial communities due to their intriguing high-temperature properties,strong chemical binding,and low atomic mobility[10,11].However,in light of the insufficient number of slip systems and/or intrinsically weak grain boundary(GB),they are usually brittle at ambient temperature,severely hindering their practical use in engineering systems[12].Previous studies reported that the change in alloy stoichiometry has a significant beneficial effect on the ductility of intermetallic *** instance,Liu et al.

关键词： intermetallic ductility alloys

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A Simple Dynamic Controller for Emulating Human Balance Control 12th

A Simple Dynamic Controller for Emulating Human Balance Cont...

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Proceedings of the 12th International Conference on Biomimetic and Biohybrid Systems, Living Machines 2023

作者： McNeal, J. Stu Hunt, Alexander Department of Mechanical and Materials Engineering Maseeh College of Engineering and Computer Science Portland State University PortlandOR97201 United States

ISBN: (纸本)9783031395031

This paper presents a biologically inspired control system developed for maintaining balance in a simulated human atop an oscillating platform. This work advances our previous research by adapting a human balance controller to an inverted pendulum and controlled by linear-Hill muscle models. To expedite neuron/synapse parameter value selection, we employ a novel two-stage process that pairs a previously developed analytic method with particle swarm optimization. Using the parameter values found analytically as inputs for particle swarm optimization (PSO), we take advantage of the benefits of each method while avoiding their pitfalls. Our results show that PSO optimization allowed improved balance control from modest ( © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Inverted pendulum

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Effect of vacuum heat treatment on microstructure and corrosion behavior of HVOF sprayed AICoCrFeNiCu high entropy alloy

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Journal of Iron and Steel Research International 2023年第8期30卷 1550-1561页

作者： Yong-kuan Zhou l Jia-jie Kang Guo Jin Xiu-fang Cui Jie Zhang Guo-zheng Ma Zhi-qiang Fu Li-na Zhu Ding-shun She Yu-yun Yang School of Engineering and Technology China University of Geosciences(Beijing)Beijing 100083China School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212100JiangsuChina Zhengzhou Institute China University of Geosciences(Beijing)Zhengzhou 451283HenanChina College of Material Science and Chemical Engineering Harbin Engineering UniversityHarbin 150001HeilongjiangChina Department of Mechanical Engineering Imperial College LondonLondon SW72AZUK National Key Lab for Remanufacturing Academy of Armored Forces EngineeringBeijing 100072China

To improve the corrosion resistance of coalbed methane drilling equipment,an AICoCrFeNiCu high entropy alloy coating was prepared on the AISI 4135(35CrMo)steel substrate by high velocity oxygen fuel(HVOF)technology,and the coating was subjected to vacuum heat treatment(VHT)at different temperatures(500,700,900 and 1100℃).The corrosion test of the substrate and the coatings after VHT in coalbed methane drilling fluid was carried *** results show that the HVOF sprayed AICoCrFeNiCu high entropy alloy(HEA)coating has a good bonding with the substrate,and the porosity of the coating is about 2.4%.There is partial segregation in the coating,and the coating mainly consists of body-centered cubic *** coating has good thermal stability,and the phase structure and microstructure of the coatings have changed after VHT at different *** with the substrate,the as-sprayed coating has better uniform corrosion resistance,and the corrosion resistance of the coating after VHT is further *** VHT at 500℃,the HVOF-sprayed AICoCrFeNiCu HEA coating has the best corrosion resistance.

关键词： High velocity oxygen fuel AICoCrFeNiCu high entropy alloy coating Vacuum heat treatment Microstructure Corrosion

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The Use of Fuzzy IF-THEN Rules for Modeling Relationship Between Steel Alloy Composition and Its Characteristics 16th

The Use of Fuzzy IF-THEN Rules for Modeling Relationship Bet...

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16th International Conference on Application of Fuzzy Systems, Soft Computing and Artificial Intelligence Tools, ICAFS 2023

作者： Jabbarov, T.G. Department of Mechanical and Materials Science Engineering Azerbaijan State Oil and Industry University 20 Azadliq Avenue Baku1010 Azerbaijan

ISBN: (纸本)9783031762826

The problem of increasing the efficiency and service life of a heavily loaded metallurgical tool, despite numerous studies and many years of searching, still does not have an optimal solution and is a very urgent task of scientific, technical and practical importance. An analysis of literature sources shows that the promising direction for improving the quality of large-sized metallurgical tools is the development of the optimal chemical composition of the microalloying complex of the alloy and the method of its thermal hardening. In this article, we consider construction of fuzzy IF-THEN rules from experimental data to describe the relationship between the composition of a material and its properties. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Microalloying

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A generative deep learning framework for inverse design of compositionally complex bulk metallic glasses

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npj Computational materials 2023年第1期9卷 2196-2203页

作者： Ziqing Zhou Yinghui Shang Xiaodi Liu Yong Yang Department of Mechanical Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongChina City University of Hong Kong(Dongguan) 523000 DongguanChina College of Mechatronics and Control Engineering Shenzhen University518060 ShenzhenChina Department of Materials Science and Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongChina Department of Advanced Design and System Engineering College of EngineeringCity University of Hong KongKowloon TongKowloonHong KongChina

The design of bulk metallic glasses(BMGs)via machine learning(ML)has been a topic of active research ***,the prior ML models were mostly built upon supervised learning algorithms with human inputs to navigate the high dimensional compositional space,which becomes inefficient with the increasing compositional complexity in ***,we develop a generative deep-learning framework to directly generate compositionally complex BMGs,such as high entropy *** framework is built on the unsupervised Generative Adversarial Network(GAN)algorithm for data generation and the supervised Boosted Trees algorithm for data *** studied systematically the confounding effect of various data descriptors and the literature data on the effectiveness of our framework both numerically and *** importantly,we demonstrate that our generative deep learning framework is capable of producing composition-property mappings,therefore paving the way for the inverse design of BMGs.

关键词： inverse metallic entropy

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Effect of power and deposition time on sputtered hydroxyapatite thin film coatings on stainless steel 304

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materials Today: Proceedings 2022年 62卷 4584-4588页

作者： Oladijo, S.S. Akinlabi, E.T. Jen, T.C. Mwema, F.M. Oladijo, O.P. Department of Mechanical Engineering Science University of Johannesburg South Africa Ibadan Nigeria Department of Mechanical Engineering Dedan Kimathi University of Technology Kenya Department of Chemical Materials and Metallurgical Engineering Botswana International University of Science and Technology Palapye Botswana

Hydroxyapatite was coated on stainless steel 304 via rf magnetron sputtering. The coatings were sputtered with varying rf power (50 W, 75 W, and 100 W) and the deposition time (1.5 h, 2 h, and 2.5 hrs.). The topography and corrosion behaviors of the samples were investigated using the BRUKER Dimension Edge Atomic Force Microscope machine and electrochemical test. The results revealed that the hydroxyapatite thin film coatings enhanced the substrate's surface roughness and corrosion. The topography and corrosion resistance were considerably influenced by the sputtering parameters, with an increase in power resulting in a decrease in surface roughness. © 2022

关键词： Hydroxyapatite

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Manufacturing of PEEK-PDMS Composite materials for Intervertebral Disc Implants 23

Manufacturing of PEEK-PDMS Composite Materials for Intervert...

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23rd International Conference on Electronics Packaging, ICEP 2024

作者： Mie, Heng-Ching Liu, Yu-Chen Mizuno, Jun National Cheng Kung University Department Of Materials Science And Engineering Taiwan National Cheng Kung University Program On Smart And Sustainable Manufacturing Academy Of Innovative Semiconductor And Sustainable Manufacturing Taiwan National Cheng Kung University Department Of Mechanical Engineering Taiwan

ISBN: (纸本)9784991191176

The current treatment approach for lower back pain caused by intervertebral disc (IVD) degeneration involves the use of PEEK (polyether ether ketone) polymer or titanium alloy based spinal cages to replace the degenerated IVD. However, this method not only restricts the natural mobility of the vertebrae but also fails to mimic the structure and function of the human IVD with a single material. Additionally, the use of high-hardness materials may lead to vertebral settling, further contributing to lower back pain. Therefore, this study is dedicated to utilizing high-biocompatibility polymer (PEEK and Polydimethylsiloxane (PDMS)) composites to create an artificial IVD closely mimics the real intervertebral disc. Through adjusting the manufacture parameters, the proportion of PEEK and PDMS, and the porosity we were able to achieve the elastic modulus that is close to those of humans' IVD. Furthermore, the dual-layer structure can better replicate the functions and structure of human intervertebral disc then spinal cage. © 2024 Japan Institute of Electronics Packaging.

关键词： Polydimethylsiloxane

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0906 | Experimental Investigation of Increased Bearing Capacity When Imparting Vibration to Loose Ground in Low Atmospheric Pressure 21

0906 | Experimental Investigation of Increased Bearing Capac...

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21st International and 12th Asia-Pacific Regional Conference of the International Society for Terrain-Vehicle Systems, ISTVS 2024

作者： Watanabe, Tomohiro Iizuka, Kojiro Department of Engineering Mechanical Engineering Program Niigata University Niigata Prefecture Niigata City Japan Department of Science and Engineering Machinery and Control Systems Shibaura Institute of Technology Saitama Prefecture Saitama City Japan

ISBN: (纸本)9781942112570

Recently, legged robots have attracted considerable attention as highly mobile rovers for planetary exploration. However, the surfaces of celestial bodies such as Mars and the Moon are primarily loose, causing slippage due to surface deformation from the rover's leg movements. To mitigate this, a walking method aimed at preventing slippage was proposed. In this walking method, the bearing capacity is increased by imparting vibration from the rover's leg to the loose soil on the ground. This walking method improved the mobility performance of the legged rover. It is crucial to investigate the increase in bearing capacity by imparting vibration in a realistic space environment to validate the effectiveness of the proposed method. This study examines the change in bearing capacity due to vibration under low atmospheric pressure, a condition found on Mars and the Moon. This condition affects the characteristics of ground sand due to decreased air resistance. Our findings provide valuable insights into using vibration in planetary exploration to enhance the performance of legged rovers. The experimental results indicate that the bearing capacity under low atmospheric pressure is nearly identical to that under standard atmospheric pressure, suggesting that atmospheric pressure conditions have minimal impact on the bearing capacity when vibration is applied. © 2024 International Society for Terrain-Vehicle Systems. All rights reserved.

关键词： Atmospheric pressure

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Prioritizing Performance Indicators for the Circular Economy Transition in Healthcare Supply Chains

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Circular Economy and Sustainability 2024年第1期5卷 231-276页

作者： Alfina, Kartika Nur Ratnayake, R. M. Chandima Wibisono, Dermawan Basri, Mursyid Hasan Mulyono, Nur Budi School of Business and Management Institut Teknologi Bandung (ITB) Bandung Indonesia Department of Mechanical and Structural Engineering and Materials Science University of Stavanger Stavanger Norway

The emergence of the circular economy (CE) paradigm is a key driver in steering industrial sectors towards sustainability. The formulation of a robust circularity strategy depends on a comprehensive assessment, which is closely related to the overarching goal of managing the transition to circularity. The initial phase of transition within the healthcare sector reinforces the need to seamlessly integrate CE principles. It is therefore imperative to define and carefully monitor indicators that will help assess and improve sustainability, operational efficiency, supply chain resilience and stakeholder satisfaction, including both consumers and patients. The primary objective of this research is to prioritize relevant performance indicators that will be critical in measuring the effectiveness of the transition to a circular economy within the healthcare supply chain. To achieve this objective, the study employs the Analytic Hierarchy Process (AHP), a well-established methodology known for its effectiveness in solving complex multi-criteria challenges. The AHP is used to prioritize performance indicators that facilitate the management of the circular economy transition in the healthcare supply chain. The focus is on improving the quality of care, optimizing delivery efficiency, and emphasizing environmental sustainability within the healthcare paradigm. The methodological framework includes the identification of key main criteria covering environmental, social, economic, and logistical dimensions. These criteria are further refined with the inclusion of 14 sub-criteria, resulting in a list of 16 key performance indicators (KPIs). Additionally, the study proposes an alternative business model advocating for the implementation of the Circular Supply Chain Operation Reference Model (circular SCOR). This model offers a perspective for rapid change in supply chain processes towards circular transition within the healthcare system. The final stage of the research involves ver

关键词： Analytic Hierarchy Process (AHP) Circular economy Circular SCOR Healthcare sector supply chain Performance indicators

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