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Enhancement of mechanical Properties of Rolled AZ31 Alloy by Utilizing Ultrasonic Nano-crystalline Surface Modification (UNSM) Treatment and Heat Treatment

Enhancement of Mechanical Properties of Rolled AZ31 Alloy by...

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Magnesium Technology Symposium held at the TMS Annual Meeting and Exhibition, 2024

作者： Kim, Hyun Ji Jo, Sumi Amanov, Auezhan Park, Sung Hyuk School of Materials Science and Engineering Kyungpook National University Daegu41566 Korea Republic of Department of Mechanical Engineering Sun Moon University Asan31460 Korea Republic of

ISBN: (纸本)9783031502392

Mg alloysMagnesium alloys (Mg alloys) have great potential as lightweight structural materials due to their low density, but their application is limited due to lower mechanical propertiesmechanical Properties compared to other lightweight alloys. The Ultrasonic Nano-crystalline Surface ModificationUltrasonic Nano-Crystalline Surface Modification (UNSM) (UNSM) technique, which induces severe plastic deformationPlastic deformation on the material surface using ultrasonic impacts, can result in a gradient microstructureGradient microstructure with a refined surface consisting of nano-sized grains, and an intermediate microstructure with residual strain, ultimately enhancing mechanical properties. While the nano-crystalline surface contributes to improved strength and ductility, the residual strain in the intermediate microstructureMicrostructure brings about a significant reduction in ductility. However, the residual strain can be beneficial for both strength and ductility through recovery and recrystallizationRecrystallization, achieved through an appropriate annealing treatment. In this study, we applied the UNSMUltrasonic Nano-Crystalline Surface Modification (UNSM)-treatment, followed by subsequent annealing at 200 °C, to a homogenized rolled AZ31 alloyAZ31 alloy to simultaneously improve strength and ductility by generating a gradient microstructureGradient microstructure. © The Minerals, Metals & materials Society 2024.

关键词： Microstructure

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Various topological phases and their abnormal effects of topological acoustic metamaterials

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Interdisciplinary materials 2023年第2期2卷 179-230页

作者： Yan-Feng Chen Ze-Guo Chen Hao Ge Cheng He Xin Li Ming-Hui Lu Xiao-Chen Sun Si-Yuan Yu Xiujuan Zhang National Laboratory of Solid-State Microstructures&Department of Materials Science and Engineering Nanjing UniversityNanjingChina Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjingChina Jiangsu Key Laboratory of Artificial Functional Materials Nanjing UniversityNanjingChina School of Materials Science and Intelligent Engineering Nanjing UniversitySuzhouChina School of Mechanical Engineering Nanjing University of Science and TechnologyNanjingChina

The last 20 years have witnessed growing impacts of the topological concept on the branches of physics,including materials,electronics,photonics,and *** describes objects with some global invariant property under continuous deformation,which in mathematics could date back to the 17th century and mature in the 20th *** physics,it successfully underpinned the physics of the Quantum Hall effect in *** date,topology has been extensively applied to describe topological phases in acoustic *** artificial structures,acoustic metamaterials could be well theoretically analyzed,on-demand designed,and easily fabricated by modern techniques,such as three-dimensional *** new theoretical topological models were first discovered in acoustic metamaterials analogous to electronic counterparts,associated with novel effects for acoustics closer to *** this review,we focused on the concept of topology and its realization in airborne acoustic crystals,solid elastic phononic crystals,and surface acoustic wave *** also introduced emerging concepts of non-Hermitian,higher-order,and Floquet topological insulators in *** has been shown that the topology theory has such a powerful generality that among the disciplines from electron to photon and phonon,from electronic to photonics and acoustics,from acoustic topological theory to acoustic devices,could interact and be analogous to fertilize fantastic new ideas and prototype devices,which might find applications in acoustic engineering and noisevibration control engineering in the near future.

关键词： acoustic materials robust propagation topological acoustic metamaterials topological phases

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Rare earth lanthanum pinning effect for corrosion resistance ultraefficient microwave absorption FeCo@rGO composites

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Journal of materials science & Technology 2024年第10期177卷 181-190页

作者： Junru Yao Jintang Zhou Lu Lu Feng Yang Zhengjun Yao Bo Ouyang Erjun Kan Yuxin Zuo Renchao Che Fan Wu College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211100China Ministry of Industry and Information Technology Key Laboratory of Material Preparation and Protection for Harsh Environment(Nanjing University of Aeronautics and Astronautics)Nanjing 211100China MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing School of ScienceNanjing University of Science and TechnologyNanjing 210094China School of Chemistry and Chemical Engineering Anhui UniversityHefei 230601China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsDepartment of Materials ScienceFudan UniversityShanghai 200438China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China

Magnetic metal absorbers exhibit remarkable microwave absorption ***,their practical application is severely limited due to their susceptibility to corrosion,particularly in marine *** address this challenge,we propose a novel approach involving the modification and control of FeCo/rGO microwave absorbers using rare earth lanthanum(La).This strategy aims to achieve both high-performance microwave absorption and enhanced resistance to marine *** this study,we employ a La_(2)O_(3) modifying control strategy to refine the FeCo magnetic particles and coat them with CoFe_(2)O_(4) on the surface,leveraging the pinning effect of in situ generated La_(2)O_(3) .This process enhances the interface polarization of the absorbers,thereby improving their electromagnetic performance and ma-rine corrosion ***,the La_(2)O_(3) modified FeCo@rGO composites exhibit broadband ab-sorption,covering a wide frequency range of 6.11 GHz at 1.55 ***,the electromagnetic proper-ties of the La_(2)O_(3) modified FeCo@rGO absorbers remain stable even after prolonged exposure to a 3.5 wt% NaCI solution,simulating marine conditions,for at least 15 ***,we perform first-principle calculations on FeCo and FeCo-O to validate the corrosion resistance of the La_(2)O_(3) modified FeCo@rGO composites at the atomic *** comprehensive investigation explores the control of rare earth lan-thanum modification on the size of magnetic metal particles,enabling efficient electromagnetic wave absorption and marine corrosion *** results of this study provide a novel and facile strategy for the control of microwave absorbers,offering promising prospects for future research and development in this field.

关键词： Rare earth lanthanum FeCo@rGO Microwave absorption Marine corrosion resistance

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Arduino-based Smart Flowmeter System with Frequency-to-Flowrate Mechanism 10

Arduino-based Smart Flowmeter System with Frequency-to-Flowr...

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10th International Conference on Artificial Intelligence and Robotics, QICAR 2024

作者： Razavi, Seyed Sadra Mansouri, Amirhosein Bashipour, Amin Feyz Department of Mechanical Automotive and Materials Engineering University of Windsor Toronto Canada Renewable Energy Engineering Department Shahid Beheshti University Tehran Iran School of Automotive Engineering Iran University of Science and Technology Tehran Iran

ISBN: (纸本)9798350348873

Flow measurement is one of the important requirements in various industries, and this method directly affects the quality and performance efficiency of the system. If mechanisms with better efficiency and higher accuracy are introduced, the security of industries such as energy improves. In this paper, the performance of an industrial flowmeter is improved based on programming techniques, and its structure is described. ©2024 IEEE.

关键词： Flow measurement

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Martensitic twinning transformation mechanism in a metastable IVB element-based body-centered cubic high-entropy alloy with high strength and high work hardening rate

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Journal of materials science & Technology 2022年第29期124卷 217-231页

作者： Yuhe Huang Junheng Gao Vassili Vorontsov Dikai Guan Russell Goodall David Dye Shuize Wang Qiang Zhu W.Mark Rainforth Iain Todd Department of Materials Science and Engineering University of SheffieldSheffield S13JDUnited Kingdom Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen518055China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Department of Materials Royal School of MinesImperial College LondonLondon SW72BPUnited Kingdom

Realizing high work hardening and thus elevated strength–ductility synergy are prerequisites for the practical usage of body-centered-cubic high entropy alloys(BCC-HEAs).In this study,we report a novel dynamic strengthening mechanism,martensitic twinning transformation mechanism in a metastable refractory element-based BCC-HEA(TiZrHf)Ta(at.%)that can profoundly enhance the work hardening capability,leading to a large uniform ductility and high strength *** from conventional transformation induced plasticity(TRIP)and twinning induced plasticity(TWIP)strengthening mechanisms,the martensitic twinning transformation strengthening mechanism combines the best characteristics of both TRIP and TWIP strengthening mechanisms,which greatly alleviates the strengthductility trade-off that ubiquitously observed in BCC structural *** characterization,carried out using X-ray diffraction(XRD)and electron back-scatter diffraction(EBSD)shows that,upon straining,α”(orthorhombic)martensite transformation,self-accommodation(SA)α”twinning and mechanicalα”twinning were activated *** electron microscopy(TEM)analyses reveal that continuous twinning activation is inherited from nucleating mechanical{351}type I twins within SA“{351}”<■11>typeⅡtwinnedα”variants on{351}twinning plane by twinning transformation through simple shear,thereby accommodating the excessive plastic strain through the twinning shear while concurrently refining the grain ***,consistent high work hardening rates of 2–12.5 GPa were achieved during the entire plastic deformation,leading to a high tensile strength of 1.3 GPa and uniform elongation of 24%.Alloy development guidelines for activating such martensitic twinning transformation strengthening mechanism were proposed,which could be important in developing new BCC-HEAs with optimal mechanical performance.

关键词： Metastable high entropy alloy Work hardening rate Martensitic transformation Self-accommodating martensite Twinning transformation

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Data-driven Bayesian model-based prediction of fatigue crack nucleation in Ni-based superalloys

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npj Computational materials 2022年第1期8卷 354-368页

作者： Maxwell Pinz George Weber Jean Charles Stinville Tresa Pollock Somnath Ghosh Civil&Systems Engineering Johns Hopkins UniversityBaltimoreMD21218USA Materials Department University of CaliforniaSanta BarbaraCA93106USA Departments of Civil&Systems Engineering Mechanical Engineeringand Materials Science&EngineeringJohns Hopkins UniversityBaltimoreMD21218USA

This paper develops a Bayesian inference-based probabilistic crack nucleation model for the Ni-based superalloy René88DT under fatigue loading.A data-driven,machine learning approach is developed,identifying underlying mechanisms driving crack *** experimental set of fatigue-loaded microstructures is characterized near crack nucleation sites using scanning electron microscopy and electron backscatter diffraction images for correlating the grain morphology and crystallography to the location of crack nucleation sites.A concurrent multiscale model,embedding experimental polycrystalline microstructural representative volume elements(RVEs)in a homogenized material,is developed for fatigue *** RVE domain is modeled by a crystal plasticity finite element *** anisotropic continuum plasticity model,obtained by homogenization of the crystal plasticity model,is used for the exterior domain.A Bayesian classification method is introduced to optimally select informative state variable predictors of crack *** this principal set of state variables,a simple scalar crack nucleation indicator is formulated.

关键词： crack fatigue superalloy

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Analyses of Distributions of Different Impurities for Growth of Polysilicon Ingots in Directional Solidification System

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Sensors and materials 2023年第7期35卷 2501-2514页

作者： Peng, Guoxiang Kang, Min-Chieh Hsu, Chao-Ming Yang, Cheng-Fu School of Ocean Information Engineering Jimei University Fujian Xiamen361021 China Department of Mechanical Engineering National Kaohsiung University of Science and Technology Kaohsiung807 Taiwan Department of Chemical and Materials Engineering National University of Kaohsiung Kaohsiung811 Taiwan Department of Aeronautical Engineering Chaoyang University of Technology Taichung413 Taiwan

This paper primarily focuses on simulating the variation of different impurity concentrations during the growth of polysilicon ingots. The simulation prototype employed was a directional solidification crystal growth furnace, and the governing equations of the Ansys Fluent module's finite analysis software were utilized. The simulation models used in this study included the energy, flow field, phase change (solidification and melting), heat transfer, species transport, and finite volume models. The simulation outcomes were validated using process data from Eversol Technology Co., Ltd., Taiwan. This paper explores the concentration distributions of impurities, such as oxygen and carbon elements, in argon and molten silicon during the general crystal growth process. The simulation results indicate that during the initial 5 h of polysilicon growth, the input of a large amount of argon can be used to eliminate impurities. Moreover, the results suggest that reducing the argon flow rate at the inlet at about 30 h, in the late stage of polysilicon growth, can lead to a more uniform temperature distribution in the polysilicon ingot. To enhance the quality of the grown polysilicon ingot, the impurities were concentrated in the upper part of the ingot. Additionally, the volume of air extracted at the gas outlet was increased over time to decrease the concentrations of impurities in the gas phase in the growth furnace. © MYU K.K.

关键词： Finite volume method

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Incorporating tracer particles for DVC of fibre-reinforced composites 23

Incorporating tracer particles for DVC of fibre-reinforced c...

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23rd International Conference on Composite materials, ICCM 2023

作者： Chatziathanasiou, T. Demir, O. Diehl, M. Breite, C. Mehdikhani, M. Swolfs, Y. Department of Materials Engineering KU Leuven Belgium Department of Mechanical Engineering Konya Technical University Turkey Department of Computer Science KU Leuven Belgium

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Feasibility Study of Precoated Binder-Type Electric Arc Furnace Oxidizing Slags as Aggregates for Cement Mortar 1st

Feasibility Study of Precoated Binder-Type Electric Arc Furn...

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1st International Conference on Net-Zero Built Environment: Innovations in materials, Structures, and Management Practices, NTZR 2024

作者： Lin, Wei-Ting Sprince, Andīna Hebda, Marek Mucsi, Gábor Cheng, An Pan, Huang-Hsing Department of Civil Engineering National Ilan University Yilan Taiwan Institute of Civil Engineering Faculty of Civil and Mechanical Engineering Riga Technical University Riga Latvia Department of Materials Engineering Faculty of Materials Engineering and Physics Cracow University of Technology Kraków Poland Institute of Raw Materials Preparation and Environmental Technologies University of Miskolc Miskolc Hungary Department of Civil Engineering National Kaohsiung University of Science and Technology Kaohsiung Taiwan

ISBN: (纸本)9783031696251

The study used electric arc furnace oxidizing slag (EAFOS) to substitute natural fine aggregates. However, EAFOS replacement may cause volumetric instability. Therefore, a cement, fly ash, or slag layer was coated with EAFOS as a precoated technique. Then, the effect of EAFOS on engineering properties was investigated, and the optimum amount of EAFOS was identified. The amount of coated binders was set at 20%, 25%, 30%, 35%, and 40% of the weight of EAFOS, and the water-to-binder ratio (w/b) of the coated binders was fixed at 0.50 to 0.20. The proportion of EAFOS replacing fine aggregates was 10%, 20%, 30%, 40%, and 50%, and the w/b of the mortar was fixed at 0.55. The results showed that the proportion of precoated binder was 30% of the EAFOS and the w/b was 0.30. Curing time was up to 28 days, and slag was the appropriate precoated binder. Maximum compressive strengths of mortars made with precoated EAFOS were 42.94 and 56.96 MPa at 7 and 28 days (40% replacement for fine aggregates). The maximum compressive strengths of specimens without coated EAFOS were 36.67 and 47.55 MPa at 7 and 28 days (the identical replacement). The drying shrinkage of 40% precoated slag specimens was 0.054% at 7 days and 0.074% at 28 days. The appearance of the specimens did not reveal any abnormality after 28 days of immersion in water at 70 °C. The precoated technique adopted in this study can be used as a stabilization procedure for replacing natural fine aggregates with EAFOS. © The Author(s) 2025.

关键词： Mortar

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A Kinetic Theory for the Mechanics and Remodeling of Transient Anisotropic Networks

SSRN

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SSRN 2024年

作者： Vernerey, Franck J. Rezai, Behnam Lamont, Samuel C. Department of Mechanical Engineering Program of Materials Science and Engineering University of Colorado Boulder United States

We present a statistically-based theoretical framework to describe the mechanical response of dynamically cross-linked semi-flexible polymer networks undergoing finite deformation. The theory starts from a statistical description, via a distribution function, of the chain conformation and orientation. Assuming a so-called tangent affine deformation of the chains, this distribution is then allowed to evolve in time due to a combination of elastic network distortion and a permanent chain reconfiguration enabled by dynamic cross-links. After presenting the evolution law for the chain distribution function, we reduce the theory to the evolution of the network conformation tensor in both its natural and current state. With this model, we use classical thermodynamics to determine how the stored elastic energy, energy dissipation, and true stress evolve in terms of the network conformation. We show that the model degenerates to classical anisotropic hyperelastic models when cross-links are permanent, while we recover the classical form of the transient network theory (that describes hyper-viscoelasticity) when chains are fully flexible. Theoretical predictions are then illustrated and compared to the literature for both basic model problems and biomechanically relevant situations. © 2024, The Authors. All rights reserved.

关键词： Statistical mechanics

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