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Enhanced elevated temperature wear resistance of Al-17Si-5Cu alloy after a novel short duration heat treatment

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International Journal of Minerals,Metallurgy and materials 2019年第3期26卷 360-368页

作者： Biplab Hazra Supriya Bera Bijay Kumar Show department of metallurgical and materials engineering National Institute of Technology Durgapur

The goal of the present study is to improve the elevated temperature wear resistance of an Al-17 wt%Si-5 wt%Cu alloy(AR alloy) by a novel short duration heat treatment process. The elevated temperature(100°C) dry sliding wear behavior of an AR alloy was studied after microstructural modification using the proposed heat treatment. The study revealed considerable microstructural modifications after the heat treatment and the heat treated alloy was designated as HT(heat treatment) alloy. A higher hardness value was obtained for the HT alloy compared to the AR alloy. Accordingly, the wear rate for the HT alloy was found to be significantly lower compared to the as-cast AR alloy at all applied loads. Accelerated particle pull-out for the AR alloy at elevated temperatures resulted in poor wear behavior for it compared to the HT alloy. On the other hand, the Si particles remained intact on the worn surface of the HT alloy due to the good particle/matrix bonding that resulted from the isothermal heat treatment. Furthermore, the age hardening that occurred in the HT alloy during wear provided additional wear resistance. Thus, the HT alloy at 100°C exhibited a lower wear rate compared to the AR alloy even at room temperature for all applied loads. This improvement was attributed to microstructural modification upon isothermal heat treatment along with the age hardening effect.

关键词： Al-Si alloys isothermal heat treatment wear resistance microstructural investigation

Multi-model ensemble learning for battery state-of-health estimation:Recent advances and perspectives

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Journal of Energy Chemistry 2025年第1期100卷 739-759页

作者： Chuanping Lin Jun Xu Delong Jiang Jiayang Hou Ying Liang Zhongyue Zou Xuesong Mei State Key Laboratory for Manufacturing Systems engineering Xi'an Jiaotong University Shaanxi Key Laboratory of Intelligent Robots School of Mechanical Engineering Xi'an Jiaotong University department of Electrical engineering and Automation Luoyang Institute of Science and Technology School of Mechanical engineering Hangzhou Dianzi University

The burgeoning market for lithium-ion batteries has stimulated a growing need for more reliable battery performance monitoring. Accurate state-of-health(SOH) estimation is critical for ensuring battery operational performance. Despite numerous data-driven methods reported in existing research for battery SOH estimation, these methods often exhibit inconsistent performance across different application scenarios. To address this issue and overcome the performance limitations of individual data-driven models,integrating multiple models for SOH estimation has received considerable attention. Ensemble learning(EL) typically leverages the strengths of multiple base models to achieve more robust and accurate outputs. However, the lack of a clear review of current research hinders the further development of ensemble methods in SOH estimation. Therefore, this paper comprehensively reviews multi-model ensemble learning methods for battery SOH estimation. First, existing ensemble methods are systematically categorized into 6 classes based on their combination strategies. Different realizations and underlying connections are meticulously analyzed for each category of EL methods, highlighting distinctions, innovations, and typical applications. Subsequently, these ensemble methods are comprehensively compared in terms of base models, combination strategies, and publication trends. Evaluations across 6 dimensions underscore the outstanding performance of stacking-based ensemble methods. Following this, these ensemble methods are further inspected from the perspectives of weighted ensemble and diversity, aiming to inspire potential approaches for enhancing ensemble performance. Moreover, addressing challenges such as base model selection, measuring model robustness and uncertainty, and interpretability of ensemble models in practical applications is emphasized. Finally, future research prospects are outlined, specifically noting that deep learning ensemble is poised to advance ens

关键词： Contrastive Learning

Multilayer ceramic coating for impeding corrosion of sintered NdFeB magnets

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Journal of Rare Earths 2009年第6期27卷 1003-1007页

作者： A.Ali A.Ahmad K.M.Deen department of metallurgical & materials engineering University of engineering & Technology department of Metallurgy and materials engineering CEET University of the Punjab

Sintered NdFeB magnets have complex microstructure that makes them susceptible to corrosion in active *** current paper evaluated the anticorrosion characteristics of multilayer titanium nitride ceramic coating applied through cathodic arc physical vapour deposition(CAPVD) for protection of sintered NdFeB permanent *** performance of ceramic coating was compared to the electrodeposited nickel coating having a copper *** impedance spectroscopy(EIS) and cyclic polar...

关键词： sintered NdFeB magnets multilayer ceramic coating permeable defects rare earths

Effect of Post Cryorolling Treatments on Microstructural and Mechanical Behaviour of Ultrafine Grained Al-Mg-Si Alloy

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Journal of materials Science & Technology 2014年第10期30卷 998-1005页

作者： P.Nageswara rao Dharmendra Singh R.Jayaganthan department of metallurgical and materials engineering Indian Institute of Technology Roorkee

To investigate the effect of post cryorolling treatments on simultaneous enhancement in strength and ductility of ultrafine grained material （UFG）, AI 6061 alloy was subjected to cryorolling followed by warm rolling （CR ＋ WR） and compared with cryorolling followed by short annealing （CR ＋ SA） at the same temperature. Transmission electron microscopy （TEM） was used to characterize the microstructural features of the processed material. The mechanical properties were investigated through Vickers hardness testing and tensile testing at room temperature. TEM, X-ray diffraction （XRD） and differential scanning calorimetry （DSC） were used to investigate the precipitation evolution in UFG material. Results indicated that the alloy subjected to CR ＋ WR has shown improved mechanical properties （114 HV, ultimate tensile strength （UTS）： 350 MPa） as compared to that in the case of CR ＋ SA （105 HV, UTS： 285 MPa）. The size of the precipitates observed in CR ＋ WR sample after peak ageing treatment is finer than that of peak aged CR ＋ SA sample. The UTS of peak aged CR ＋ WR sample （UTS： 390 MPa） was found to be higher than that of peak aged CR ＋ SA sample （UTS： 355 MPa）, without decrease in ductility.

关键词： Aluminium alloy Cryorolling Warm rolling Short annealing Mechanical properties Differential scanning calorimetry (DSC)

Influence of Fluoride Content of Artificial Saliva on Metal Release from 17-4 PH Stainless Steel Foam for Dental Implant Applications

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Journal of materials Science & Technology 2013年第6期29卷 582-588页

作者： Ilven Mutlu Enver Oktay department of metallurgical and materials engineering Istanbul UniversityIstanbulTurkey

Highly porous 17-4 PH stainless steel foam for implant applications was produced by space holder technique. Metal release and weight loss from 17-4 PH stainless steel foams were investigated in fluoride added artificial saliva environment by static immersion test. An inductively coupled plasma-mass spectrometer was employed to measure the concentrations of various metal ions. Effects of fluoride content of artificial saliva on metal release and weight loss from the steel foams were investigated. Effects of immersion time, pH value and process parameters on the weight loss and metal release were determined. Pore morphology, pore size and mechanical properties of the 17-4 PH stainless steel foams were also characterized.

关键词： Metal release Dental implant Metal foam Fluoride Artificial saliva

Multifunctional A356 alloy/PKSAnp composites:Microstructure and mechanical properties

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Defence Technology（防务技术） 2020年第3期16卷 731-736页

作者： V.S.Aigbodion I.C.Ezema department of metallurgical and materials engineering University of NigeriaNsukkaNigeria

Mechanical properties and microstructure of multifunctional composites produced with palm kernel shell ash nano particle(PKSAnp)-A356 alloy composites was *** composites were produced using Double layer feeding stir casting method(DLF-SCM) by adding 1 wt%-4 wt.% *** microstructure,density,electrical and mechanical properties were *** results shows that there was a uniform distribution of the PKSAnp in A356 *** mismatch at the interface between the PKSAnp and A356 alloy was 4.26%.Improvement of 30.47%,41.91%,49.52%,40.90% and 65.09% were obtained for hardness values,tensile,yield strength,%elongation and impact energy at 4 wt% *** work has established that the developed composites can be used for multifunctional applications where combination of toughness and strength is vital.

关键词： PKSAnp A356 alloy Microstructure Electrical and mechanical properties

Environmental Degradation Behavior of High-velocity Arc Sprayed FeCrBMnSi Alloy Coatings in a Coal Fired Boiler

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Acta Metallurgica Sinica(English Letters) 2013年第5期26卷 602-612页

作者： V.N.Shukla R.Jayaganthan V.K.Tewari department of metallurgical and materials engineering Indian Institute of Technology Roorkee

FeCrBMnSi alloy coating on steel substrate（310S） was fabricated by a high-velocity arc spraying（HVAS） process. Degradation behavior of the coatings at temperatures of 700℃ and 900℃ in air and in the coal fired boiler at（700±10）℃ was studied. X-ray difraction（XRD） and scanning electron microscopy/energydisperse spectroscopy（SEM/EDS） were used to characterize the coating as well as to analyze the corrosion products for elucidating the corrosion *** exhibited dense and globular morphology and the splats were interconnected as evident from SEM analysis. The maximum microhardness of the coating was found to be 630–1060 HV. The FeCrBMnSi alloy coating has imparted necessary resistance to oxidation and showed good adherence to the 310S substrate during the exposures with no tendency for spallation of its oxide scale.

关键词： HVAS process Coating Microhardness Oxidation Erosion

Response of structural and magnetic properties of ultra-thin FeCo–V foils to high-energy beam welding processes

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International Journal of Minerals,Metallurgy and materials 2015年第11期22卷 1190-1198页

作者： H.Mostaan M.Shamanian S.Hasani J.A.Szpunar department of materials and metallurgical engineering Arak University department of materials engineering Isfahan University of Technology department of Mechanical engineering University of Saskatchewan

Microstructural evolutions and grain-boundary-character distribution during high-energy-beam welding of ultra-thin Fe Co-V foils were studied. Detailed data about the boundaries, coincidence site lattice（CSL） relationships, grain sizes, and microstructural features were acquired from electron-backscatter diffraction（EBSD） maps. Moreover, the evolution of the magnetic properties during high-energy-beam welding was studied using vibrating sample magnetometry（VSM）. The fraction of low-angle boundaries was observed to increase in the fusion zones of both electron- and laser-beam-welded foils. The results showed that the fractions of low-Σ CSL boundaries（particularly twin boundaries, Σ3） in the fusion zones of the welded foils are higher than those in the base metal. Because the strain rates produced during high-energy-beam welding are very high（because of the extremely high cooling rate）, grain deformation by a slip mechanism is limited; therefore, deformation by grain twinning is dominant. VSM analysis showed that the magnetic properties of the welded foils, i.e., their remanence, coercive force, and energy product, changed significantly. The formation of large grains with preferred orientation parallel to the easy axis of magnetization was the main reason for the diminished magnetic properties.

关键词： iron cobalt vanadium alloys thin foils electron beam welding laser beam welding magnetic materials

CSRWA:Covert and Severe Attacks Resistant Watermarking Algorithm

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Computers, materials & Continua 2025年第1期82卷 1027-1047页

作者： Balsam Dhyia Majeed Amir Hossein Taherinia Hadi Sadoghi Yazdi Ahad Harati Faculty of engineering Ferdowsi University of MashhadMashhad***Iran department of Computer Techniques engineering Imam Al-Kadhum CollegeBaghdad10087Iraq

Watermarking is embedding visible or invisible data within media to verify its authenticity or protect *** watermark is embedded in significant spatial or frequency features of the media to make it more resistant to intentional or unintentional *** of these features are important perceptual features according to the human visual system(HVS),which means that the embedded watermark should be imperceptible in these ***,both the designers of watermarking algorithms and potential attackers must consider these perceptual features when carrying out their *** two roles will be considered in this paper when designing a robust watermarking algorithm against the most harmful attacks,like volumetric scaling,histogram equalization,and non-conventional watermarking attacks like the Denoising Convolution Neural Network(DnCNN),which must be considered in watermarking algorithm design due to its rising role in the state-of-the-art *** DnCNN is initialized and trained using watermarked image samples created by our proposed Covert and Severe Attacks Resistant Watermarking Algorithm(CSRWA)to prove its *** this algorithm to satisfy the robustness and imperceptibility tradeoff,implementing the Dither Modulation(DM)algorithm is boosted by utilizing the Just Noticeable Distortion(JND)principle to get an improved performance in this ***,luminance,inter and intra-block contrast are used to adjust the JND values.

关键词： Covert attack digital watermarking DnCNN JND perceptual model robustness