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Journal of Central South University 2025年第04期32卷 1237-1251页

作者：齐艳阳马晓光姜正义马丽楠王志华周存龙 HASAN Mahadi DOBRZA?SKI Leszek A. 赵敬伟 College of Mechanical Engineering Taiyuan University of Technology Engineering Research Center of Advanced Metal Composites Forming Technology and Equipment(Ministry of Education) School of Mechanical Materials Biomedical and Mechatronic Engineering University of Wollongong School of Mechanical Engineering Taiyuan University of Science and Technology Department of Industrial and Production Engineering American International University Bangladesh Medical and Dental Engineering Center for Research Design and Production ASKLEPIOS

在本研究中，将厚度为50μm的双层不锈钢-铜复合箔材分别在800、900和1000℃下退火5 min，以获得不同的微观组织结构。研究退火温度对不锈钢-铜复合箔材成形性能和微拉深件表面质量的影响，并分析了其成形机制，开发了基础模型、Vorono... 详细信息

在本研究中，将厚度为50μm的双层不锈钢-铜复合箔材分别在800、900和1000℃下退火5 min，以获得不同的微观组织结构。研究退火温度对不锈钢-铜复合箔材成形性能和微拉深件表面质量的影响，并分析了其成形机制，开发了基础模型、Voronoi模型和表面形貌模型用于分析不锈钢-铜复合箔材微拉深过程中的成形性能。结果表明，900℃退火的不锈钢-铜复合箔材的微观组织均匀且细化，因而表现出最佳的塑性。在微拉深过程中，拉深力随退火温度的升高而降低。900℃退火试样成形的微拉深件起皱较少，壁厚分布较均匀，表面质量较高。与基础模型和Voronoi模型相比，考虑材料不均匀性和表面形貌的表面形貌模型与实验结果最接近。

关键词：微拉深退火温度不锈钢-铜复合箔材成形性能起皱有限元方法

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Prediction of microstructure evolution of ZK61 alloy during hot spinning by internal state variable model

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Transactions of Nonferrous Metals Society of China 2025年第1期35卷 126-142页

作者： Jin-qi PAN Wen-cong ZHANG Jian-lei YANG Song-hui WANG Yong WU Huan LI School of Materials Science and Engineering Harbin Institute of Technology WeihaiWeihai 264209China College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

An internal state variable(ISV)model was established according to the experimental results of hot plane strain compression(PSC)to predict the microstructure evolution during hot spinning of ZK61 *** effects of the internal variables were considered in this ISV model,and the parameters were optimized by genetic *** validation,the ISV model was used to simulate the evolution of grain size(GS)and dynamic recrystallization(DRX)fraction during hot spinning via Abaqus and its subroutine *** comparing the simulated results with the experimental results,the application of the ISV model was proven to be ***,the strength of the thin-walled spun ZK61 tube increased from 303 to 334 MPa due to grain refinement by DRX and texture ***,some ultrafine grains(0.5μm)that played an important role in mechanical properties were formed due to the proliferation,movement,and entanglement of dislocations during the spinning process.

关键词： internal state variable model hot spinning ZK61 alloy finite element simulation texture evolution

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Microstructure and Tribological Properties of Hf0.1Nb1.6Mo0.3Ta0.12C0.12 Medium-Entropy Niobium-Based Coating by Laser Metal Deposition

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JOM 2025年 1-14页

作者： Sun, Tong Fang, Jinxiang He, Haotian Yang, Zhi Ma, Biao Chen, Haoteng He, Peng Wang, Yujiang Faculty of Mechanical and Electrical Engineering Kunming University of Science and Technology Kunming650500 China School of Materials Science and Engineering Harbin Institute of Technology Harbin150001 China National Key Laboratory for Remanufacturing Academy of Army Armored Forces Beijing100072 China

To address the low hardness and poor wear resistance of niobium (Nb) in practical applications, a Hf0.1Nb1.6Mo0.3Ta0.12C0.12 medium-entropy Nb-based coating was fabricated via laser metal deposition (LMD). The coating’s microstructure and tribological properties were systematically characterized. The coating exhibits a dense, defect-free microstructure with a strong metallurgical bond to the substrate. It primarily consists of a BCC phase with finely dispersed FCC-structured carbides. The microhardness reaches 365.26 HV0.2, 3.14 times that of Nb. At room temperature, the wear rate decreases by 14.46%, with adhesive and abrasive wear as dominant mechanisms. At 500°C, the wear rate reduction reaches 94.7%, with oxidative wear and slight adhesive wear. The Hf0.1Nb1.6Mo0.3Ta0.12C0.12 coating demonstrates excellent wear resistance from room temperature to 500°C, attributed to solid solution and precipitation strengthening. Further optimization of precipitate phases could enhance their hardness and wear resistance. © The Minerals, Metals & materials Society 2025.

关键词： Wear of materials

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Impact of Roughness Spanwise Wavelength on Secondary Flow Rearrangement

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Journal of Fluids engineering 2025年第8期147卷 081302页

作者： Yang, Jianzhi Yang, Xiang Liu, Luoqin Zhu, Jian Zhu, Xiaowei Department of Built Environment Hefei University of Technology Hefei ANHUI230009 China Department of Mechanical Engineering The Pennsylvania State University University ParkPA16802 United States Department of Modern Mechanics University of Science and Technology of China Hefei ANHUI230027 China Department of Mechanical and Materials Engineering Portland State University PortlandOR97207 United States

Spanwise heterogeneity in surface roughness generates secondary mean flows in a rough-wall turbulent boundary layer. This study investigates the influence of roughness spanwise wavelength on the arrangement of these secondary flows using direct numerical simulation (DNS). We systematically vary the spanwise wavelength, S/δ, from π/16 to 2π, while maintaining constant roughness height and surface coverage density. Here, S represents the roughness spanwise wavelength, and δdenotes the outer length scale, which in this case is the half-channel height. Secondary flows are observed in all DNS cases, but their configurations depend on the spanwise wavelength. Specifically, small wavelengths result in low-momentum pathways (LMPs) above the roughness elements, whereas large wavelengths lead to high-momentum pathways (HMPs) at these locations. To elucidate the mechanisms behind this rearrangement, we analyze the mean streamwise vorticity transport equation. The findings indicate that shear stress anisotropy induces another pair of secondary vortices above the roughness elements as the spanwise wavelength increases. Given that secondary flows are features of the mean flow, we further examine the budgets of the dispersive kinetic energy (DKE). The analyses reveal that at small spanwise wavelengths, shear production primarily generates DKE, while at large wavelengths, wake production becomes the dominant energy source. Building on these insights, we propose a refined classification for surfaces with spanwise heterogeneity. Copyright © 2025 by ASME.

关键词： Kinetic energy

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Technical and economic feasibility assessment for hybrid energy system electricity and hydrogen generation: A case study

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Global Energy Interconnection 2025年第1期8卷 62-81页

作者： Paul C.Okonkwo Samuel Chukwujindu Nwokolo El Manaa Barhoumi Ibrahim B.Mansir Usman Habu Taura Barun Kumar Das Ahmed Bahgat Radwan Wilfred Emori Ephraim Bonah Agyekum Khalid Al Kaaf Mechanical&Mechatronics Engineering Department Dhofar UniversitySalalah 211the Sultanate of Oman Department of Physics Faculty of Physical SciencesUniversity of CalabarCalabar PMB 1115Nigeria Electrical&Computer Engineering Department Dhofar UniversitySalalah 211the Sultanate of Oman Department of Mechanical Engineering Prince Sattam bin Abdulaziz UniversityAl-Kharj 11942Saudi Arabia Centre for Energy Research and Training Ahmadu Bello UniversityPMB 1045ZariaNigeria Oil&Gas Research Center Sultan Qaboos UniversityMuscat 123the Sultanate of Oman Department of Mechanical Engineering Rajshahi University of Engineering&TechnologyRajshahi 6204Bangladesh Center for Advanced Materials Qatar UniversityDoha 2713Qatar School of Materials Science and Engineering Sichuan University of Science and EngineeringZigong 643000PR China Department of Nuclear and Renewable Energy Ural Federal University Named after the First President of Russia BorisEkaterinburg 620002Russia Western Caspian University Baku AZ1001Azerbaijan Department of Civil and Environmental Engineering Dhofar UniversitySalalah 211the Sultanate of Oman

Hydrogen is emerging as a promising alternative to fossil fuels in the transportation *** study evaluated the feasibility of estab-lishing hydrogen refueling stations in five cities in Oman,Duqm,Haima,Sur,Al Buraymi,and Salalah,using Hybrid Optimization of Multiple Electric Renewables(HOMER)*** hybrid energy systems,photovoltaic-wind turbine-battery,photovoltaic-battery,and wind turbine-battery were analyzed for each *** indicated that Duqm offers the lowest net present cost(NPC),levelized cost of energy,and levelized cost of hydrogen,making it the most cost-effective ***,Sensitivity analysis showed that as the life of electrolyzer increases during operation,the initial capital expenditure is distributed over a longer operational period,leading to a reduction in the *** so,renewable energy systems produced no emissions which supports Oman’s mission *** comprehensive analysis confirms the feasibility of establishing a hydrogen refueling station in Duqm,Oman,and highlights advanced optimization techniques’superior capability in designing cost-effective,sustainable energy systems.

关键词： Cities Economic indicator Hydrogen production Optimization Solar

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β-Pb_(3)P_(2)S_(8):A new optical crystal with exceptional birefringence effect

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Chinese Chemical Letters 2025年第2期36卷 486-489页

作者： Weiping Guo Ying Zhu Hong-Hua Cui Lingyun Li Yan Yu Zhong-Zhen Luo Zhigang Zou Key Laboratory of Eco-materials Advanced Technology Key Laboratory of Advanced Materials Technologies International(HongKong Macao and Taiwan)Joint Laboratory on Advanced Materials TechnologiesCollege of Materials Science and EngineeringFuzhou UniversityFuzhou 350108China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China Mechanical and Electrical Engineering Practice Center Fuzhou UniversityFuzhou 350108China Eco-materials and Renewable Energy Research Center College of Engineering and Applied SciencesNanjing UniversityNanjing 210093China

Birefringent crystals play an irreplaceable role in optical systems by adjusting the polarization state of light in optical *** work successfully synthesized a new thiophosphate phase ofβ-Pb_(3)P_(2)S_(8)through the high-temperature solid-state spontaneous crystallization *** from the cubicα-Pb_(3)P_(2)S_(8),theβ-Pb_(3)P_(2)S_(8)crystallizes in the orthorhombic Pbcn space ***,β-Pb_(3)P_(2)S_(8)shows a large band gap of 2.37 e V in lead-based chalcogenides,wide infrared transparent window(2.5-15μm),and excellent thermal ***,the experimental birefringence shows the largest value of0.26@550 nm in chalcogenides,even larger than the commercialized oxide *** Barder charge analysis result indicates that the exceptional birefringence effect is mainly from the Pb^(2+)and S^(2-)in the[Pb S_n]***,the parallelly arranged polyhedral layers could improve the structural ***,this work supports a new method for designing chalcogenides with exceptional birefringence effect in the infrared region.

关键词： Birefringent crystals Optical properties Chalcogenides β-Pb3P2S8 Structural anisotropic

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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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Recent advances of cerium compounds in functional coatings:Principle,strategies and applications

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Journal of Rare Earths 2025年第2期43卷 227-245,I0001页

作者： Kai An Youqiang Wang Yi Sui Yongquan Qing Wei Tong Xuezhao Wang Changsheng Liu School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao266520China State Key Laboratoryof Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou 014030China School of Materials Science and Engineering Northeastern UniversityShenyang110819China Center for Nano and Micro Mechanics Tsinghua UniversityBejing100084China

Cerium(Ce) compounds have attracted considerable attention as key components in functional coatings due to their many outstanding *** work provides a comprehensive review of recent advances in the application of Ce in functional *** role of Ce in the improvement of functional properties such as corrosion-resistance,self-healing,superhydrophobicity,wear-resistance,and UV shielding is reviewed from the perspective of functional mechanism and applied ***,the strategies,processes,practical problems,and current challenges in the research of functional coatings containing Ce are summarized and *** objective is to highlight the great potential of Ce in functional coatings,and to explore new applications of Ce in the development of novel ***,this work aims to enhance the application value of Ce,solving the problem of unbalanced application of rare-earth elements.

关键词： Cerium Functional coatings Corrosion Superhydrophobicity UV resistance Rare earths

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Using plunging-Type testing to investigate process mechanics at micro scale machining 20

Using plunging-Type testing to investigate process mechanics...

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20th CIRP Conference on Modeling of Machining Operations in Mons, CIRP CMMO 2025

作者： Adeeb, Syed Ahsan Karpat, Yigit Bilkent University Department of Industrial Engineering Ankara06800 Turkey Bilkent University Department of Mechanical Engineering Ankara06800 Turkey UNAM-Institute of Materials Science and Nanotechnology Ankara06800 Turkey

In plunging-Type tests, a cutting tool is given a sinusoidal movement as the work material with a web on its surface is rotated at a constant speed. If the amplitude and feed rate of the cutting tool and rotational speed of the work material are correctly set, the plunging test can be completed within a full rotation. As a result, a detailed investigation of different episodes of micro-scale machining, such as rubbing, plowing, and shearing, can be conducted with a single test. Combined with force measurements and cut chip morphology, the process mechanics can be investigated in detail. This study conducted plunging tests on an ultra-precision CNC with a diamond cutting tool on commercially pure titanium alloy. The differences in tangential and normal forces observed during plunge-in and pull-out periods corresponding to the same amplitude were analyzed using an analytical model. Resultant forces during the pull-out phase are larger than those observed in the plunge-in phase, attributed to an increase in cut chip thickness. A computational model of the plunging-Type experiment has also been developed based on the findings of the analytical model. The proposed hybrid approach may be useful to improve identification of material constitutive model parameters based on micro scale machining experiments. © 2025 The Authors.

关键词： Titanium alloys

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Self-organization in a stably stratified, valley-shaped enclosure heated from below

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Physical Review Fluids 2025年第1期10卷 014402-014402页

作者： Patrick J. Stofanak Cheng-Nian Xiao Inanc Senocak Department of Mechanical Engineering and Materials Science University of Pittsburgh Pittsburgh Pennsylvania 15261 USA

We observe the spontaneous onset of three-dimensional motion from a quiescent, purely conductive state of a stably stratified fluid in a V-shaped enclosure heated from below, which ultimately self-organizes into a two-dimensional steady state without any external forcing to the initial configuration. We identify a dominant three-dimensional instability through modal stability analysis. Direct numerical simulations confirm this instability but also reveal that, after an initial period of spontaneous three-dimensional growth, the flow gradually self-organizes into a steady two-dimensional state without external intervention. This self-organization manifests consistently for any arbitrary infinitesimal three-dimensional disturbance to the initial quiescent configuration. We demonstrate that the mechanism driving this self-organization is the increasing dominance of viscous dissipation over buoyant production of disturbance kinetic energy at later stages of flow evolution from the initial quiescent state. Our investigation reveals a flow scenario in which the most natural transition pathway to the final state involves passing through an intermediate state with a higher dimension than the final state itself. Specifically, our final flow state is less complex than the three-dimensional most unstable eigenvector predicted by linear-stability analysis. We demonstrate that the entire flow evolution remains nonturbulent throughout and closely aligns with results from linear-stability analysis, distinguishing the present flow dynamics from transient chaos, which also features complex transient states that eventually converge to a less complex final state.

关键词： Kinetic energy

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