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Structure and corrosion behavior of FeCoCrNiMo high-entropy alloy coatings prepared by mechanical alloying and plasma spraying

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International Journal of Minerals,Metallurgy and materials 2024年第12期31卷 2692-2705页

作者： Yun Tian Jianing Liu Mingming Xue Dongyao Zhang Yuxin Wang Keping Geng Yanchun Dong Yong Yang School of Materials Science and Engineering Hebei University of TechnologyTianjin 300132China Key Lab.for New Type of Functional Materials in Hebei Province School of Materials Science and EngineeringState Key Laboratory of Reliability and Intelligence of Electrical EquipmentHebei University of TechnologyTianjin 300132China School of Mechanical Engineering Tianjin Sino-German University of Applied SciencesTianjin 300132China

FeCoCrNiMox composite powders were prepared using the mechanical alloying technique and made into high-entropy alloy(HEA)coatings with the face-centered cubic phase using plasma spraying to address the element segregation problem in HEAs and pre-pare uniform HEA *** electron microscopy,transmission electron microscopy,and X-ray diffractometry were employed to characterize these coatings’microstructure and phase *** hardness,elastic modulus,and fracture toughness of coatings were tested,and the corrosion resistance was analyzed in simulated *** show that the hardness of the coating is HV0.1606.15,the modulus of elasticity is 128.42 GPa,and the fracture toughness is 43.98 MPa·m^(1/2).The corrosion potential of the coating in 3.5wt%NaCl solution is-0.49 V,and the corrosion current density is 1.2×10^(−6)A/cm^(2).The electrochemical system comprises three parts:the electrolyte,the adsorption and metallic oxide films produced during immersion,and the FeCoNiCrMo HEA *** in-creasingly long periods,the corrosion reaction rate increases first and then decreases,the corrosion product film comprising metal oxides reaches a dynamic balance between formation and dissolution,and the internal reaction of the coating declines.

关键词： high-entropy alloy coatings plasma spray mechanical alloying microstructure corrosion behavior mechanical property

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Multi-objective design optimization of polymer spur gears using a hybrid approach

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Journal of engineering and Applied science 2024年第1期71卷 105页

作者： Elsiedy, Marah A. Hegazi, Hesham A. El-Kassas, Ahmed M. Zayed, Abdelhameed A. Department of Production Engineering and Mechanical Design Faculty of Engineering Tanta University Tanta Egypt Mechanical Design and Production Engineering Department Faculty of Engineering Cairo University Giza12613 Egypt Design and Production Engineering Department Faculty of Engineering and Materials Science German University in Cairo Cairo11835 Egypt

Polymer gears are used in applications requiring small to moderate loads to effectively transmit power and use the limited place available as possible. Various commercial standards have been provided designers with the rating criteria and acquaintance of different polymer material properties for the process of design. However, the result was unsatisfactory in terms of economy, time, and the optimality of the product. Thus, classic and stochastic algorithms have been embraced to reach the best design of polymer gears. Taking advantage of the former and latter algorithm’ methods, optimal design of gears could be attained with an increased gear life span and decreased failure modes. In this study, polyoxymethylene (POM) spur gear set has been optimized combining the mathematical model from plastic standards and hybrid optimization approach of multi-objective genetic algorithm (MOGA) and sequential quadratic programming (SQP). Weight and power loss were the objective functions. Five design variables were optimized with the satisfaction of bending and contact stresses, temperature, wear, and deformation as constraints. Solutions of the problem were formulated as Pareto optimal set. The results of multi-objective were compared with previously published single-objective optimization. The results favored multi-objective optimization (82.67%, 31.39% reduction in weight and power loss respectively) as it gave the best applicable solution fitting in real life situations. The results also went hand in hand with literature confirming the efficiency of the proposed algorithm. With the variation of operating parameters, various optimal designs could be obtained where the designers can choose the design that is suitable for a particular application. © The Author(s) 2024.

关键词： Quadratic programming

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Enhancement of the corrosion resistance of the Mg alloy ZW61 by dual-frequency ultrasonic vibration

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Journal of Magnesium and Alloys 2024年第12期12卷 4887-4908页

作者： Zhaoyang Yin Qichi Le Qi Zou Liang Ren Weiyang Zhou Yanchao Jiang Xingrui Chen Andrej Atrens Qiyu Liao Key Lab of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819PR China School of Mechanical and Mining Engineering The University of QueenslandBrisbane 4072Australia School of Materials Science and Engineering Northeastern UniversityShenyang 110819PR China

Ultrasonic vibration was introduced into the casting of quasicrystal-reinforced magnesium alloy *** microstructure,mechanical properties,and corrosion resistance were *** dual-frequency ultrasonic field(DUF)treatment reduced the α-Mg grain size from 502μm to 69μm,and the aggregated lamellar I-phase was refined into tiny dot-like shapes with a smaller area *** corrosion and electrochemical tests indicated that DUF decreased the corrosion rate from 10 mm·y^(-1)to 3mm·y^(-1)with a denser protective oxide *** not only significantly enlarged the effective cavitation area but also reduced the dependence of transient cavitation on the initial bubble *** ratio R_(max)^(3)/t_(c) was used to qualitatively characterize the cavitation strength,and cavitation dynamics calculations indicated that DUF had higher cavitation strength compared to single-frequency ultrasonic field(SUF).An equation for corrosion rate versus microstructural parameters(grain size,second phase fraction,potential difference)was developed,which could well predict the corrosion rate of magnesium alloy ZW61 without and with different ultrasonic vibrations.

关键词： Magnesium alloy Dual-frequency ultrasonic Corrosion behavior Grain refinement Quasicrystal I-phase

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Prediction and optimisation of gasoline quality in petroleum refining: The use of machine learning model as a surrogate in optimisation framework

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CAAI Transactions on Intelligence Technology 2024年第5期9卷 1185-1198页

作者： Husnain Saghir Iftikhar Ahmad Manabu Kano Hakan Caliskan Hiki Hong School of Chemical and Materials Engineering National University of Sciences and TechnologyIslamabadPakistan Department of Systems Science Kyoto UniversityKyotoJapan Department of Mechanical Engineering Faculty of Engineering and Natural SciencesUsak UniversityUsakTurkey Department of Mechanical Engineering Kyung Hee UniversityYonginRepublic of Korea

Hardware-based sensing frameworks such as cooperative fuel research engines are conventionally used to monitor research octane number (RON) in the petroleum refining industry. Machine learning techniques are employed to predict the RON of integrated naphtha reforming and isomerisation processes. A dynamic Aspen HYSYS model was used to generate data by introducing artificial uncertainties in the range of ±5% in process conditions, such as temperature, flow rates, etc. The generated data was used to train support vector machines (SVM), Gaussian process regression (GPR), artificial neural networks (ANN), regression trees (RT), and ensemble trees (ET). Hyperparameter tuning was performed to enhance the prediction capabilities of GPR, ANN, SVM, ET and RT models. Performance analysis of the models indicates that GPR, ANN, and SVM with R2 values of 0.99, 0.978, and 0.979 and RMSE values of 0.108, 0.262, and 0.258, respectively performed better than the remaining models and had the prediction capability to capture the RON dependence on predictor variables. ET and RT had an R2 value of 0.94 and 0.89, respectively. The GPR model was used as a surrogate model for fitness function evaluations in two optimisation frameworks based on genetic algorithm and particle swarm method. Optimal parameter values found by the optimisation methodology increased the RON value by 3.52%. The proposed methodology of surrogate-based optimisation will provide a platform for plant-level implementation to realise the concept of industry 4.0 in the refinery.

关键词： genetic algorithms mach in ne learning multi-objective optimisation

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THREE-AXIS SATELLITE ATTITUDE CONTROL USING THREE OPTIMAL FRACTIONAL-ORDER PIλDµ CONTROLLERS AND ADVANCED SWARM INTELLIGENCE ALGORITHMS

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Telecommunications and Radio engineering (English translation of Elektrosvyaz and Radiotekhnika) 2023年第6期82卷 13-20页

作者： Nail, Bachir Mechanical Engineering Materials and Structures Laboratory Faculty of Science and Technology Tissemsilt University Algeria

This work develops three optimal fractional-order PIλDµ controllers for a three-axis satellite tracking attitude. The nonlinear differential equation of the satellite model is linearized around its operating orbital frame, local horizontal, local vertical (LHLV), and stabilized by linear quadratic regulator (LQR), to obtain a stable linear continuous or discrete state space model with first order. Each of the three controllers to be designed consists of five parameters that should be chosen optimally: three gains Kp, Ki, and Kd;and two fractional orders λ and µ. Two advanced meta-heuristics algorithms are used to select the best parameters: the Harris hawks optimizer (HHO), and the artificial hummingbird algorithm (AHA). Based on the results shown and comparative study with conventional controllers, the proposed tuned controllers directed the satellite to follow the desired angle trajectories in the three directions efficiently. © 2023 by Begell House, Inc.

关键词： Controllers

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Highly active and durable La_(0.6) Ca_(0.4)(CrMnFeCo_(2)Ni)O_(3) high entropy perovskite oxide as electrocatalyst for oxygen evolution reaction in alkaline media

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Journal of materials science & Technology 2024年第1期168卷 71-78页

作者： Xiaoqiang Ji Fan Yang Yunzhu Du Jing Li Jianguo Li Qiaodan Hu Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Oxygen evolution reaction(OER)is the imperative reaction for many energy storage and conversion devices such as recharge-able metal-air batteries and electrochemical water splitting[1].OER is a complex 4-electron process with sluggish kinetics and therefore requires electrocatalysts to overcome the high *** oxide(RuO_(2))and iridium oxide(IrO_(2))catalysts can promote the OER process remarkably[2-4],however,their ex-tremely high cost,natural scarcity,and long-term instability con-strain their scale-up application in clean-energy technologies[5,6].It is crucial to develop inexpensive,highly efficient,and durable electrocatalysts for OER.

关键词： entropy alkaline perovskite

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Nickel-based superalloy architectures with surface mechanical attrition treatment: Compressive properties and collapse behaviour

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Nano materials science 2024年第5期6卷 587-595页

作者： Lizi Cheng Xiaofeng Zhang Jiacheng Xu Temitope Olumide Olugbade Gan Li Dongdong Dong Fucong Lyu Haojie Kong Mengke Huo Jian Lu CityU-Shenzhen Futian Research Institute ShenzhenChina Department of Mechanical Engineering City University of Hong KongHong KongChina Department of Engineering University of CambridgeCambridgeUK National Engineering Laboratory for Modern Materials Surface Engineering Technology&The Key Lab of Guangdong for Modern Surface Engineering Technology Institute of New MaterialsGuangdong Academy of Science510650GuangzhouChina Mechanical and Electronic Engineering Department School of Science and EngineeringUniversity of DundeeDundeeUK Centre for Advanced Structural Materials City University of Hong Kong Shenzhen Research InstituteGreater Bay Joint DivisionShenyang National Laboratory for Materials ScienceShenzhenChina

Surface modifications can introduce natural gradients or structural hierarchy into human-made microlattices,making them simultaneously strong and ***,we describe our investigations of the mechanical properties and the underlying mechanisms of additively manufactured nickel–chromium superalloy(IN625)microlattices after surface mechanical attrition treatment(SMAT).Our results demonstrated that SMAT increased the yielding strength of these microlattices by more than 64.71%and also triggered a transition in their mechanical *** primary failure modes were distinguished:weak global deformation,and layer-by-layer collapse,with the latter enhanced by *** significantly improved mechanical performance was attributable to the ultrafine and hard graded-nanograin layer induced by SMAT,which effectively leveraged the material and structural *** results were further validated by finite element *** work provides insight into collapse behaviour and should facilitate the design of ultralight yet buckling-resistant cellular materials.

关键词： Architected materials Selective laser melting Surface mechanical attrition treatment Structural analysis Ductile alloy

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Numerical study on the effect of in-situ stress on smoothwall blasting in deep tunnelling

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Underground Space 2023年第4期11卷 96-115页

作者： Xudong Li Kewei Liu Jiacai Yang Yanyan Sha Ruitao Song School of Resources and Safety Engineering Central South UniversityChangsha 410083China Department of Mechanical and Structural Engineering and Materials Science University of StavangerStavanger 4021Norway

In the present study,a numerical model is first calibrated against the crack networks and pressure attenuation data in laboratory blasting ***,based on the calibrated numerical model,two-hole plane models are developed and used to perform a series of sim-ulations of smoothwall blasting in deep tunnelling subjected to in-situ *** evolutions of rock fracture and excavation damage zone in the roof/floor and sidewalls under different far-field hydrostatic pressure and anisotropic in-situ stress conditions are numerically *** findings in numerical modelling are also analytically interpreted with the stress distributions around the designed tunnel perimeter and perimeter *** numerical and analytical results show that the variations of rock cracking and excavation dam-aged zone induced by smoothwall blasting with in-situ stress are mainly attributed to the high tangential compressive stress concentration around the remaining rock after inner primary blasts and the tensile stress acting on the wall of perimeter hole,which control the crack propagation and initiation *** last,the implications of findings for practical smoothwall blasting in deep tunnelling are discussed.

关键词： Smoothwall blasting In-situ stress Crack propagation Excavation damaged zone Stress distribution Numerical simulation

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Solid-state bonding process induced highly synergistic mechanical properties of 6061 Al alloy joint by shear deformation

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Journal of materials science & Technology 2023年第33期164卷 168-178页

作者： Peng Peng Jian Su Qingsong He Ruinan Chen Sensen Chai Daliang Yu Qingwei Dai Jian Lu School of Metallurgy and Materials Engineering Chongqing University of Science and TechnologyChongqing401331China Department of Mechanical Engineering City University of Hong KongHong KongChina

Obtaining a highly synergistic mechanical property between joint and base metal(BM)in aluminum(Al)alloy is a chronic *** this work,shear bonding technology is applied to a commercial 6061 Al *** results show that a flat and uniform joint interface is *** joint presents a highly synergistic mechanical property compared with BM,whether after shear bonding or heat *** joint coefficient reaches 95.6%after shear bonding and exceeds 100%after heat treatment,which is better than the traditional connection method of aluminum *** high joint coefficient mainly originates from the well-linked joint and gradient grain *** gradient grain structure is beneficial to activate more slip systems to coordinate plastic *** the fine-grained structure is sacrificed after heat treatment,higher strength and joint coefficient are obtained due to the higher work *** newly developed method has a large potential for application to the infinite rolling of Al alloy sheets and can also be used for Al alloy connection in automobile,aerospace,rail transportation,and other *** findings in this work can provide essential theoretical support and application reference for the shear connection of Al alloy.

关键词： 6061 Al alloy Shear bonding Microstructure mechanical property

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Preparation and toughening mechanism of Al_(2)O_(3) composite ceramics toughened by B_(4)C@TiB_(2) core–shell units

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Journal of Advanced Ceramics 2023年第12期12卷 2371-2381页

作者： Yingjie Shi Weixing Li Xiaorong Zhang Jiachao Jin Jilin Wang Yu Dong Jingbo Mu Guangsuo Wang Xiaoliang Zhang Zhixiao Zhang Key Laboratory of New Inorganic Nonmetallic Composites of Handan College of Materials Science and EngineeringHebei University of EngineeringHandan 056038China Key Laboratory of Intelligent Industrial Equipment Technology of Hebei Province College of Mechanical and Equipment EngineeringHebei University of EngineeringHandan 056038China College of Materials Science and Engineering Guilin University of TechnologyGuilin 532100China School of Civil and Mechanical Engineering Curtin UniversityPerth 6845Australia

In this paper, the concept of incorporating core–shell structured units as secondary phases totoughen Al_(2)O_(3) ceramics is proposed. Al_(2)O_(3) composite ceramics toughened by B_(4)C@TiB_(2) core–shellunits are successfully synthesized using a combination of molten salt methodology and spark plasmasintering. The synthesis of B_(4)C@TiB_(2) core–shell toughening units stems from the prior production ofcore–shell structural B_(4)C@TiB_(2) powders, and this core–shell structure is effectively preserved withinthe Al_(2)O_(3) matrix after sintering. The B_(4)C@TiB_(2) core–shell toughening unit consists of a micron-sizedB4C core enclosed by a shell approximately 500 nm in thickness, composed of numerous nanosizedTiB2 grains. The regions surrounding these core–shell units exhibit distinct geometric structures andencompass multidimensional variations in phase composition, grain dimensions, and thermal expansioncoefficients. Consequently, intricate stress distributions emerge, fostering the propagation of cracks inmultiple dimensions. This behavior consumes a considerable amount of crack propagation energy,thereby enhancing the fracture toughness of the Al_(2)O_(3) matrix. The resulting Al_(2)O_(3) composite ceramicsdisplay relative density of 99.7%±0.2%, Vickers hardness of 21.5±0.8 GPa, and fracture toughness6.92±0.22 MPa·m1/2.

关键词： Al_(2)O_(3)composite ceramics microstructure design core-shell structure toughening mechanism spark plasma sintering(SPS)

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