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Chemical-element-distribution-mediated deformation partitioning and its control mechanical behavior in high-entropy alloys

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Journal of materials science & Technology 2022年第25期120卷 99-107页

作者： Jia Li Baobin Xie Quanfeng He Bin Liu Xin Zeng Peter KLiaw Qihong Fang Yong Yang Yong Liu College of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082China College of Science and Engineering City University of Hong KongHong KongChina State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Department of Materials Science and Engineering The University of TennesseeKnoxville 37996USA

The chemical element distributions always strongly affect the deformation mechanisms and mechanical properties of alloying ***,the detailed atomic origin still remains unknown in highentropy alloys(HEAs)with a stable random solid ***,considering the effect of elemental fluctuation distribution,the deformation behavior and mechanical response of the widely-studied equimolar random Co Cr Fe Mn Ni HEA are investigated by atomic simulations combined with machine learning and micro-pillar compression *** elemental anisotropy factor is proposed,and then used to evaluate the chemical element *** experimental and simulation results show that the local variations of chemical compositions exist and play a critical role in the deformation partitioning and mechanical *** high strength and good plasticity of HEAs are obtained via tuning the chemical element distributions,and the optimal elemental anisotropy factor ranges from 2.9 to 3 using machine *** trend can be attributed to the cooperative mechanisms depending on the local variational composition:massive partial dislocation multiplication at an initial stage of plastic deformation,and the inhibition of localized shear banding via the nucleation of deformation twinning at a later *** the new insights gained here,it would be possible to create new metallic alloys with superior properties through thermal-mechanical treatment to tailoring the chemical element distribution.

关键词： Machine learning High-entropy alloy Plasticity High strength Atomic simulation

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Reactive surface intermediates over Ni-grafted TiO2 nanotube arrays towards hydrogen evolution reaction in alkaline and chloride media

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International Journal of Hydrogen Energy 2023年第81期48卷 31479-31490页

作者： Cheshideh, Hamed Chen, Hsueh-Yu Liao, Kuo-Wei Wang, Kai-Chin Chen, Guan-Cheng Huang, Hsin-Chih Wang, Chen-Hao Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei106335 Taiwan Global Development Engineering Program National Taiwan University of Science and Technology Taipei106335 Taiwan Advanced Manufacturing Research Center National Taiwan University of Science and Technology Taipei106335 Taiwan

In this study, the Ni nanoparticles grafted TiO2 nanotubes electrode improved by surface reconstruction (s-Ni/TiO2/Ti) shows the facile hydrogen evolution reaction (HER) in the alkaline and chloride solutions. Nickel nanoparticles were electrochemically grafted on the anodic TiO2 nanotubes under different conditions. The heat treatment of TiO2 nanotubes contributes to the enhancement of electrical conductivity and template adherence. The surface reconstruction is indicated to create heterojunction intermediates, Ni(OH)2 and NiOOH, on the surface of Ni nanoparticles. An extremely low overpotential of 126 mV is required for HER on the s-Ni/TiO2/Ti electrode in 1.0 M KOH solution, showing higher activity than Pt/C. Besides, the developed electrode exhibits an overpotential of 127 mV for HER in 1.0 M KOH + 0.5 M NaCl solution. The long-term stability over 100 h suggests a highly active and inexpensive material choice for substituting the precious electrocatalysts in corrosive media such as seawater. © 2023 Hydrogen Energy Publications LLC

关键词： Titanium dioxide

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Bioconvection Mangnetohydrodynamic Tangent Hyperbolic Nanofluid Flow with Quartic Chemical Reaction Past a Paraboloid Surface

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Computer Modeling in engineering & sciences 2022年第1期130卷 205-220页

作者： S.M.Atif W.A.Khan Muhammad Abbas Umair Rashid Department of Mathematics Capital University of Science and TechnologyIslamabadPakistan Department of Mechanical Engineering College of EngineeringPrinceMohammad Bin Fahd UniversityAl KhobarSaudi Arabia Department of Mathematics University of SargodhaSargodhaPakistan CASKey Laboratory of Mechanical Behavior andDesign of Materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefeiChina

In this numerical study,the effect of quartic autocatalysis type of chemical reaction,buoyancy force and thermal radiation phenomenon and magnetic effect on tangent hyperbolic nanofluid past an upper horizontal surface of a paraboloid has been *** considering the Buongiorno model approach,a diffusion of unequal coefficients in the presence of gyrotactic microorganism is *** of microorganism’s idea is used to stabilize the nanoparticles through *** modeled PDEs of the problems are converted into nonlinear ODEs with the assistant of the similarity *** tackle nonlinear ODEs,MATLAB package bvp4c is *** addition,a hallmark of the Matlab code with the reported results in the literature is achieved by *** variations in motion,concentration,temperature,and motile density due to sundry parameters have been analyzed in-depth via *** analysis shows that the density profile of motile of microorganism is hiked with an increment in the bioconvection Rayleigh number but decreases for higher thermal Grashof number.

关键词： Quartic autocatalysis tangent hyperbolic nanofluid brownian motion paraboloid of revolution MHD flow thermophoresis

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Grain Growth Behavior in Electrodeposited Nanocrystalline FeCoNi Medium-entropy Alloy 28

Grain Growth Behavior in Electrodeposited Nanocrystalline Fe...

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28th Congress of the International Federation for Heat Treatment and Surface engineering, IFHTSE 2023

作者： Watanabe, Atsuya Yamamoto, Takahisa Nambu, Koichiro Takigawa, Yorinobu Department of Materials Science Graduate School of Engineering Osaka Metropolitan University Sakai599-8531 Japan Department of Materials Design Innovation Engineering Graduate School of Engineering Nagoya University Nagoya464-8603 Japan Department of Mechanical Engineering Graduate School of Engineering Osaka Sangyo University Daito574-8530 Japan

ISBN: (纸本)9781713889533

Bulk nanocrystalline FeCoNi MEA with a high tensile strength was developed recently. Grain refinement is a hopeful approach to achieving excellent mechanical properties in HEAs/MEAs, however, the thermal stability of microstructure in the alloy has not been clarified enough. In this study, we investigated microstructure evolution in nanocrystalline FeCoNi MEA annealing at a 300-1000 °C temperature range. Sharp increases in the grain size were repeatedly found. Each plateau range formed respective orientations. © 2023 28th IFHTSE 2023 Congress. All rights reserved.

关键词： Nanocrystals

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mechanical properties and corrosion resistance of two new titanium alloys for orthopaedics applications

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materials Today: Proceedings 2023年 72卷 544-549页

作者： Jiménez-Marcos, Cristina Baltatu, Madalina Simona Florido-Suárez, Néstor Ruben Socorro-Perdomo, Pedro Pablo Vizureanu, Petrica Mirza-Rosca, Julia Claudia University of Las Palmas de Gran Canaria Department of Mechanical Engineering Campus Universitario de Tafira Las Palmas de Gran Canaria 35017 Spain Gheorghe Asachi Technical University of Iasi Department of Technologies and Equipments for Materials Processing Faculty of Materials Science and Engineering Blvd. Mangeron No. 51 Iasi 700050 Romania

Due to the compatibility problems of biomaterials currently used in biomedicine, the effect of Silicon addition to the innovative TiMoZr alloy has been investigated. The mechanical properties of these two alloys and their corrosion resistance in simulated body fluid were analyzed in order to recommend them for the manufacture of medical instruments. After the application of the corresponding techniques, the metallographic study shows only the two-phase structure of the sample with silicon, which has lower modulus of elasticity values and higher Vickers microhardness values. The sample without silicon offers a higher resistance to corrosion, although these values between the two samples are very close. © 2022

关键词： Corrosion resistance

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Carbon nanotube films with ultrahigh thermal-shock and thermalshock-fatigue resistance characterized by ultra-fast ascending shock testing

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Nano Research 2024年第8期17卷 6777-6784页

作者： Mingquan Zhu Shijun Wang Yunxiang Bai Feng Gao Zhenxing Zhu Congying Wang Peng Zhang Hao Jin Hui Zhang Luqi Liu Zhiping Xu Xinghong Zhang Fei Wei Zhong Zhang CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Department of Engineering Mechanics Tsinghua UniversityBeijing 100084China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150001China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei 230027China

The exploration of material failure behavior not only involves defining its limits and underlying mechanisms but also entails devising strategies for improvement and protection in extreme ***'ve pioneered an advanced multi-scale,high-speed ascending thermal shock testing platform capable of inducing unprecedented heat shocks at rates surpassing 105℃/*** meticulous examination of the thermal shock responses of carbon nanotube(CNT)films,we've achieved remarkable *** employing an innovative macro-scale synchronous tightening and relaxing approach,we've attained a critical temperature differential in CNT films that exceeds an exceptional 2500℃—surpassing any previously reported metric for highperformance,thermal-shock-resistant ***,these samples have demonstrated exceptional resilience,retaining virtually unchanged strength even after enduring 10,000 thermal shock cycles at temperatures exceeding 1000℃.Furthermore,our research has revealed a novel thermal shock/fatigue failure mechanism that fundamentally diverges from conventional theories centered on thermal stress.

关键词： carbon nanotubes failure behavior thermal shock characterization

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Dynamic Analysis of Switching Type Disturbance Suppression Control System Based on Disturbance Estimation of Triaxial Active Control Magnetic Bearing 49

Dynamic Analysis of Switching Type Disturbance Suppression C...

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49th Annual Conference of the IEEE Industrial Electronics Society, IECON 2023

作者： Maruyama, Hai Heya, Akira Hirata, Katsuhiro Osaka University Division of Materials and Manufacturing Science Osaka Japan Nagoya University Department of Mechanical Systems Engineering Nagoya Japan

ISBN: (纸本)9798350331820

A triaxial active control magnetic bearing with an axially asymmetric structure has been developed for a high-temperature turbomachinery. Since this magnetic bearing has a support force interference, disturbance suppression was not possible. A nonlinear compensator has already been proposed to solve this problem. However, the disturbance suppression performance is insufficient. Therefore, this paper proposes a switching type disturbance suppression control system that estimates a disturbance from the states and switches the controller characteristics based on an estimated disturbance. This model improves the disturbance observer performance of the already proposed a variable structure type nonlinear control system. First, the characteristics of the proposed model are presented, followed by the disturbance estimation performance of the proposed model. Next, the disturbance suppression performance of the proposed model and a conventional compensator is compared. The results verify the superiority of the proposed model over conventional compensators. © 2023 IEEE.

关键词： Magnetic bearings

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Flow-Through Experiments of Reactive Ba-Sr-Mg Brines in Mons Chalk at North Sea Reservoir Temperature at Different Injection Rates 84

Flow-Through Experiments of Reactive Ba-Sr-Mg Brines in Mons...

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2023 SPE EuropEC - Europe Energy Conference featured at the 84th EAGE Annual Conference and Exhibition, EURO 2023

作者： Andersen, Pål Østebø Herlofsen, Sander Sunde Korsnes, Reidar Inge Minde, Mona Wetrhus Department of Energy Resources University of Stavanger Norway Department of Energy and Petroleum Engineering University of Stavanger Stavanger Norway Department of Mechanical and Structural Engineering and Materials Science University of Stavanger Stavanger Norway

ISBN: (纸本)9781613999912

Chalk reservoirs in the North Sea of Norway contain significant amounts remaining oil and gas, and are potential candidates for enhanced recovery by modifying the injected brine composition. This work investigates how brines with divalent cations Ba, Sr and Mg interact when injected into chalk (CaCO3). Ba and Sr are often associated with mineral precipitation and occur in formation water while Mg is present in seawater, commonly injected in chalk. Relatively clean (>99% calcite) outcrop chalk cores from Mons, Belgium, were flooded at 130 °C in triaxial cells with four brines containing 0.12 mol/L divalent cations: either 0.06 mol/L Sr and Ba, 0.06 mol/L Sr and Mg, or 0.12 mol/L Ba or Sr. Each brine was injected in a separate core, with 100 to 150 pore volumes. The injection rate was varied between 0.5 and 8 pore volumes per day. Produced brine was analyzed continuously and compared with the injected brine composition. After flooding, the cores flooded with only Ba or only Sr were cut into slices and analyzed locally in terms of Scanning Electron Microscopy (SEM), matrix density, specific surface area and X-Ray diffraction. In all experiments, the produced divalent cation concentration was reduced compared to the injected value. The total reduction of injected cation concentration closely equaled the produced Ca concentration (from calcite dissolution). When flooding 0.12 mol/L Sr, the Sr concentration depleted 50%, while when flooding 0.12 mol/L Ba, 10% Ba depleted. When injecting equal concentrations of Ba and Sr, 40% Sr and 7% Ba depleted, while with equal concentrations of Mg and Sr injected, ~50% Sr was retained and almost no Mg depleted. Sr appeared to dominate and suppress other reactions. There was little sensitivity in steady state concentrations with variation in injection rate. The similar modification of the brine regardless of residence time suggests the reactions reached equilibrium. Cutting the cores revealed a visually clear front a few cm from the in

关键词： Dissolution

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Ductilization of 2.6-GPa alloys via short-range ordered interfaces and supranano precipitates

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science (New York, N.Y.) 2025年第6732期387卷 401-406页

作者： Yan, Yong-Qiang Cha, Wen-Hao Liu, Sida Ma, Yan Luan, Jun-Hua Rao, Ziyuan Liu, Chang Shan, Zhi-Wei Lu, Jian Wu, Ge Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano) Hysitron Applied Research Center in China (HARCC) and Center for Alloy Innovation and Design (CAID) State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an China Laboratory for Multiscale Mechanics and Medical Science SV LAB School of Aerospace Xi'an Jiaotong University Xi'an China Faculty of Georesources and Materials Engineering RWTH Aachen University Aachen Germany Department of Materials Science and Engineering Delft University of Technology Delft Netherlands Inter-University 3D Atom Probe Tomography Unit Department of Mechanical Engineering City University of Hong Kong Hong Kong China Max Planck Institute for Sustainable Materials Düsseldorf Germany National Engineering Research Center of Light Alloy Net Forming Shanghai Jiao Tong University Shanghai China Centre for Advanced Structural Materials Department of Materials Science and Engineering City University of Hong Kong Hong Kong China

Higher strength and higher ductility are desirable for structural materials. However, ultrastrong alloys inevitably show decreased strain-hardening capacity, limiting their uniform elongation. We present a supranano (<10 nanometers) and short-range ordering design for grain interiors and grain boundary regions, respectively, in fine-grained alloys based on vanadium, cobalt, and nickel, with additions of tungsten, copper, aluminum, and boron. The pronounced grain boundary-related strengthening and ductilization mechanism is realized through segregation of the short-range ordering near the grain boundary. Furthermore, the supranano ordering with a larger size has an enhanced pinning effect for dislocations and stacking faults, multiplied and accumulated in grain interiors during plastic deformation. These mechanisms promote continuously increased flow stress until fracture of the alloy at 10% strain with 2.6-gigapascal tensile stress.

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Central composite design and optimization of selected stir casting parameters on flexural strength and fracture toughness mTiO2p/Al 7075 composites

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materials Today: Proceedings 2022年 62卷 4574-4583页

作者： Abiodun Balogun, Oluwatosin Adewale Akinwande, Abayomi Adebayo Ogunsanya, Olusegun Oladele Ademati, Akeem Adesoji Adediran, Adeolu John Erinle, Tunji Titilayo Akinlabi, Esther Department of Metallurgical and Materials Engineering Federal University of Technology Ondo State Akure Nigeria Department of Materials Science and Engineering Hohai University Hohai China Department of Agricultural and Resource Economics Federal University of Technology Ondo State Akure Nigeria Department of Mechanical Engineering Landmark University Kwara State Omu-Aran Nigeria The Federal Polytechnic Mechanical Engineering Department P.M.B. 5351 Ado-Ekiti Nigeria Directorate Pan African University for Life and Earth Sciences Institute Ibadan Nigeria Department of Mechanical Engineering Science University of Johannesburg South Africa

Ceramic particulate like titanium dioxide play major role in enhancement of properties of aluminium composites for high strength-low weight applications. The major process used in the dispersion of the particles in the melt is the stir casting route. There is need for incremental studies on the modelling and optimization of the procedure. This study reports the influence of stirring temperature, speed, and time on the flexural strength and fracture toughness of Al 7075 reinforced with 10 wt% micro titanium dioxide of average size 13 µm, produced via stir casting. Central composite design (CCD) was employed in the design of experiment and specimen were produced according to the experimental runs. The result of the analysis of variance (ANOVA) showed that the parameters contributed significantly to the responses and satisfactory models were obtained for the properties under investigation. The interaction between the parameters revealed that increasing speed and time ensued improvement in the properties. An uptrend in temperature was observed to enhance the flexural strength but reduce fracture toughness. Response surface optimization revealed combined parameters for optimal performance as 643.4 ˚C, 423 rpm, and 30 mins for temperature, speed and time respectively yielding 470.4 MPa and 34.7 MPa.m1/2 for flexural strength and fracture toughness in that order. Model validation experiment was carried out using the combined parameters and deviation of −0.024 and + 0.014 were obtained for the flexural strength and fracture toughness respectivelyectively. Since the values were less than 0.05, the models were concluded to be statistically fit for resposne prediction. © 2022

关键词： Titanium dioxide

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