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

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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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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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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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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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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Revealing the Wear Behavior of Chemical Vapor Deposited Monolayer WS2 Using AFM Under Ambient Conditions 1

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11th International Conference on Industrial Tribology, IndiaTrib-2022

作者： Rai, Himanshu Thakur, Deepa Kumar, Deepak Pitkar, Ashutosh Ye, Zhijiang Balakrishnan, Viswanath Gosvami, Nitya Nand Department of Materials Science and Engineering Indian Institute of Technology Hauz Khas Delhi New Delhi110016 India Mechanical Engineering Department Carnegie Mellon University PittsburghPA15213 United States School of Engineering Indian Institute of Technology Mandi Himachal Pradesh Mandi175075 India Department of Mechanical and Manufacturing Engineering Miami University OxfordOH45056 United States

ISBN: (数字)9789819992645

ISBN: (纸本)9789819992638

In the present study, atomic force microscopy (AFM) was used to analyze the wear behavior of tungsten disulfide (WS2) grown using chemical vapor deposition (CVD). It was discovered that the essential load-carrying capability of the interior area of the WS2 flake was greater than the edge region. Also, the inconsistent wear behavior in both conditions was explained by experimental results. The presence of structural defects can explain the observed disparity in the wear behavior. This work provides a path for enhancing the tribological characteristics of monolayer WS2 as a 2D solid lubricant since edges are usual in CVD-grown two-dimensional (2D) materials and cannot be avoided. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Solid lubricants

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Bioinspired Zwitterionic Block Polymer-Armored Nitric Oxide-Generating Coating Combats Thrombosis and Biofouling

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Research 2025年第1期2024卷 870-884页

作者： Qing Ma Wentai Zhang Xiaohui Mou Nan Huang Haimang Wang Hongyu Zhang Zhilu Yang School of Materials Science and Engineering Key Lab of Advanced Technology of Materials of Education MinistrySouthwest Jiaotong UniversityChengdu610031China Dongguan Key Laboratory of Smart Biomaterials and Regenerative Medicine The Tenth Affiliated HospitalSouthern Medical UniversityDongguan523059China GuangZhou Nanchuang Mount Everest Company for Medical Science and Technology Guangzhou510670China State Key Laboratory of Tribology in Advanced Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing100084China Wenzhou Institute University of Chinese Academy of SciencesWenzhou352001 ZhejiangChina

Thrombosis and infection are 2 major complications associated with central venous catheters(CVCs),resulting in substantial mortality and *** concurrent long-term administration of antibiotics and anticoagulants to address these complications have been demonstrated to cause severe side effects such as antibiotic resistance and *** mitigate these complications with minimal or no drug utilization,we developed a bioinspired zwitterionic block polymer-armored nitric oxide(NO)-generating functional coating for surface modification of *** armor was fabricated by precoating with a Cu-dopamine(DA)/selenocysteamine(SeCA)(Cu-DA/SeCA)network film capable of catalytically generating NO on the CVCs surface,followed by grafting of a zwitterionic p(DMA-b-MPC-b-DMA)polymer *** synergistic effects of active attack by NO and copper ions provided by Cu-DA/SeCA network and passive defense by zwitterionic polymer brush imparted the CVCs surface with durable antimicrobial properties and marked inhibition of platelets and *** in vivo studies confirmed that the surface-armored CVCs could effectively reduce inflammation and inhibit thrombosis,indicating a promising potential for clinical applications.

关键词： biofouling central venous catheters thrombosis nitric oxide zwitterionic block polymer central venous catheters cvcs resulting antibiotic resistance bioinspired coating

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Corrosive wear behavior of a new medium manganese steel compared to 316L stainless steel in 3.5% NaCl solution

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Surface science and Technology 2025年第1期3卷 1-15页

作者： Li, Shilin Guan, Kunpeng Huang, Xingmin Wang, Fengtao Ji, Xiulin Department of Mechanical Engineering Shantou University Shantou China School of Materials Science & Engineering Southwest Jiaotong University Chengdu China

Applying metals without passivation ability in corrosive environments presents a significant challenge. Medium manganese steel (MMS), a widely used wear-resistant metal, had been investigated for its tribocorrosion behavior following critical annealing at different temperatures, with potential applications in seawater. Notably, the new MMS alloy, designated as 5MnAl, demonstrates superior corrosive wear resistance compared to 316L stainless steel (SS) in a 3.5% NaCl solution, with an average wear rate reduction ranging from 69.3% to 93.9% and lower friction coefficients under 10–60 N load. Specifically, the corrosive wear rate of 316L SS is more than 16 times higher than that of 750 °C annealed 5MnAl under an applied load of 60 N. Additionally, corrosion-induced wear volume loss (Vcw) typically accounts for more than half of the total volume loss. The corrosive wear rate of 5MnAl can be significantly reduced by applying a cathodic protection potential of -1.2 V. Consequently, due to its outstanding resistance to mechanical wear, metals without passivation ability may offer superior prospects for use in friction components in seawater environments compared to 316L SS.

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