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Y-pbsn10 antifriction alloys microalloyed with mischmetal

UPB Scientific Bulletin, Series B: Chemistry and materials science 2021年第4期83卷 307-313页

作者： Avram, Vasile Semenescu, Augustin Csáki, Ioana Material Science and Engineering Faculty University POLITEHNICA of Bucharest Romania

Antifriction alloys are used for different applications as bearings and bearings rolls. During the time the micro-alloying for this type of alloys was realized with Cd, Ni, As, Mg and P. For this paper we selected YPbSn10 as base alloy and we investigated the changes induced by the micro alloying with mischmetal in amounts of 0.1, 0.2, 0.5 and 1%. The optical microstructure obtained was investigated, in comparison with the original alloy, and the Brinell hardness and compression strength were evaluated. The results obtained are promising the HB hardness being improved with 8% and compression strength with 9%. © 2021, Politechnica University of Bucharest. All rights reserved.

关键词： Microalloying

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NH_(4)Cl-assisted preparation of single Ni sites anchored carbon nanosheet catalysts for highly efficient carbon dioxide electroreduction

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Journal of materials science & Technology 2023年第11期142卷 1-9页

作者： Dan Ping Feng Yi Guiwei Zhang Shide Wu Shaoming Fang Kailong Hu Ben Bin Xu Junna Ren Zhanhu Guo Henan Provincial Key Laboratory of Surface&Interface Science Henan Engineering Research Center of Chemical Engineering Separation Process IntensificationSchool of Material and Chemical EngineeringZhengzhou University of Light IndustryZhengzhou 450002China School of Materials Science and Engineering Harbin Institute of TechnologyShenzhen 518055China Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle upon Tyne NE18STUK College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Department of Chemical&Biomolecular Engineering Integrated Composites Lab(ICL)University of TennesseeKnoxvilleTN 37996USA

Single-atomic transition metal-nitrogen codoped carbon(M-N-C)are efficient substitute catalysts for noble metals to catalyze the electrochemical CO_(2) reduction reaction(CO_(2)RR).However,the uncontrolled aggregations of metal and serious loss of nitrogen species constituting the M-N_(x) active sites are frequently observed in the commonly used pyrolysis ***,single-atomic nickel(Ni)-based sheet-like electrocatalysts with abundant Ni-N_(4) active sites were created by using a novel ammonium chloride(NH_(4)Cl)-assited pyrolysis *** aberration correction electron microscopy and X-ray absorption fine structure analysis clearly revealed that Ni species are atomically dispersed and anchored by N in Ni-N_(4) *** addition of NH_(4)Cl optimized the mesopore size to 7-10 nm and increased the concentrations of pyridinic N(3.54 wt%)and Ni-N_(4)(3.33 wt%)*** synergistic catalytic effect derived from Ni-N_(4) active sites and pyridinic N species achieved an outstanding CO_(2) RR performance,presenting a high CO Faradaic efficiency(FE_(CO))up to 98% and a large CO partial current density of 8.5 mA cm^(-2) at a low potential of-0.62 V ***,the FE_(CO) maintains above 80% within a large potential range from -0.43 to -0.73 V *** work provides a practical and feasible approach to building highly active single-atomic catalysts for CO_(2) conversion systems.

关键词： CO_(2)reduction Electrocatalyst Single-atomic ni NH_(4)Cl Pyridinic N

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Corrosion and wear properties of TB2 titanium alloy borided by pack boriding with La_(2)O_(3)

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Transactions of Nonferrous Metals Society of China 2022年第3期32卷 868-881页

作者： De-yi QU Dan LIU Xin-yu WANG Yong-hua DUAN Ming-jun PENG Faculty of Material Science and Engineering Kunming University of Science and TechnologyKunming 650093China

To improve the surface performance of TB2 alloy,pack boriding was performed at 1100℃ for 20 h with 4 wt.%La_(2)O_(3).The composition and thickness of boride layer and corrosion and wear properties of borided TB2 alloy were *** results show that La_(2)O_(3) can promote the growth,continuity,and compactness of boride layer,and the length of TiB whisker increases from 16.80 to 21.84μ*** reason is that La_(2)O_(3) can react with B to form La−B active groups and further to improve the growth of the boride *** wear and corrosion resistances of TB2 alloy are enhanced by boriding with La_(2)O_(3).The wear mechanisms are adhesive wear and abrasive wear for unborided and borided TB2 alloys,respectively,and the corrosion mechanism is changed from local corrosion(unborided TB2 alloy)to uniform corrosion(borided TB2 alloy).

关键词： TB2 alloy pack boriding wear properties corrosion performance

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DMD-T: Thermographic Inspection of Composites using Dynamic Mode Decomposition 5

DMD-T: Thermographic Inspection of Composites using Dynamic ...

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5th International Conference on Industrial Artificial Intelligence, IAI 2023

作者： Cheng, Liangliang Zhu, Yunpeng Kersemans, Mathias University of Groningen Engineering and Technology Institute Groningen Faculty of Science and Engineering Groningen Netherlands Queen Mary University of London School of Engineering and Material Science London United Kingdom Ghent Belgium

ISBN: (纸本)9798350325294

In the realm of Non-Destructive Testing (NDT) of fibre reinforced polymers, InfraRed Thermography (IRT) serves as a valuable tool for diagnosis. Various processing techniques, such as principal component analysis, Fourier transformation, and thermographic signal reconstruction, are commonly utilized to improve the identification of defects. However, the practical application of infrared thermography is limited by the need for expert operator experience, which hampers its broader adoption in industrial settings. This paper presents a preliminary examination of the application of data-driven based Dynamic Mode Decomposition (DMD) to study the thermal dynamics of composites and evaluate its potential for defect detection. The new method is known as the DMD for Thermography (DMD-T). The performance has been validated via an experimental dataset of a Carbon Fibre Reinforced Polymer (CFRP) plate with an impact damage. © 2023 IEEE.

关键词： Dynamic mode decomposition

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Dark Forest Algorithm:A Novel Metaheuristic Algorithm for Global Optimization Problems

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Computers, materials & Continua 2023年第5期75卷 2775-2803页

作者： Dongyang Li Shiyu Du Yiming Zhang Meiting Zhao Faculty of Electrical Engineering and Computer Science Ningbo UniversityNingbo315000China Engineering Laboratory of Advanced Energy Materials Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo315000China School of Material and Chemical Engineering Ningbo UniversityNingbo315000China

Metaheuristic algorithms,as effective methods for solving optimization problems,have recently attracted considerable attention in science and engineering *** are popular and have broad applications owing to their high efficiency and low *** algorithms are generally based on the behaviors observed in nature,physical sciences,or *** study proposes a novel metaheuristic algorithm called dark forest algorithm(DFA),which can yield improved optimization results for global optimization *** DFA,the population is divided into four groups:highest civilization,advanced civilization,normal civilization,and low *** civilization has a unique way of *** verify DFA’s capability,the performance of DFA on 35 well-known benchmark functions is compared with that of six other metaheuristic algorithms,including artificial bee colony algorithm,firefly algorithm,grey wolf optimizer,harmony search algorithm,grasshopper optimization algorithm,and whale optimization *** results show that DFA provides solutions with improved efficiency for problems with low dimensions and outperforms most other algorithms when solving high dimensional *** applied to five engineering projects to demonstrate its *** results show that the performance of DFA is competitive to that of current well-known metaheuristic ***,potential upgrading routes for DFA are proposed as possible future developments.

关键词： Metaheuristic algorithm global optimization

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Satellite Data-based Structural Mapping Reveals Active Panjal Traps Fault(PTF)in Kashmir,NW Himalaya

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Acta Geologica Sinica(English Edition) 2024年第S01期98卷 58-61页

作者： Afroz Ahmad SHAH Muhammad Gazali RACHMAN Anushka VASHISTHA Ajay DASHORA Geosciences Programme Faculty of ScienceUniversity Brunei DarussalamBE1410Brunei Universitas Pembangunan Nasional“Veteran” Yogyakarta 55283Indonesia Department of Civil Engineering Indian Institute of Technology GuwahatiAssam 781039India

Exploring the evidence for unidentified earthquake-causing faults in the orogenic zones,and primarily the interior parts(Shah,2013),has been an ongoing quest for centuries(Willis,1923;Baker et al.,1988;Yeats et al.,1992;Wesnousky et al.,1999;Malik et al.,2010;Coudurier-Curveur et al.,2020;Shah et al.,2020).These faults are potentially dangerous due to their unknown risk and deformation budget,two of the most important aspects of mapping and understanding the vulnerability and hazards associated with active faults.

关键词： gravitational tectonics active tectonics normal faults deformation domains Himalaya

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Passive Domestic Air-Conditioning Using PCM Modules 2

Passive Domestic Air-Conditioning Using PCM Modules

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2nd International Conference on Smart Cities 4.0, Smart Cities 4.0 2023

作者： Gayar, Karim El Taha, Karim Mahallawy, Nahed El The German University Faculty Of Engineering And Material Science Design And Production Engineering Department Cairo Egypt Rubitherm Technologies Llc Cairo Egypt

ISBN: (纸本)9781665474306

Passive cooling systems have garnered much attention in recent years as a sustainable and cost-effective method of regulating indoor temperatures. Phase change materials (PCM) are a promising technology for such systems, as they can store and release large amounts of thermal energy during the phase transition process while maintaining the temperature in a very specific range. In this study, we investigated the performance of a passive cooling system using PCM modules and evaluated the effect of different variables on its cooling efficiency. Several tests were conducted, varying the ambient temperature, number of plates, and PCM type to determine the optimal conditions for the system. A PCM with a melting temperature of around 22°C was used and was compared to ice. While ice showed a larger cooling effect, the advantage of the PCM emerged with elevated ambient temperatures. Compared to ice, and due to the smaller the temperature difference Δ T between the PCM melting temperature and the ambient temperature, the cooling effect of the PCM, lasted for a significantly longer time. Moreover, increasing the number of plates proved to elongate the cooling effect, due to increasing the overall thermal storage capacity of the system. Overall, our findings suggest that a passive cooling system using PCM technology can be an effective solution for regulating indoor temperatures. However, careful consideration must be given to the choice of PCM type and melting temperature, as well as the number of plates in the system, to optimize its performance. © 2023 IEEE.

关键词： Phase change materials

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Approach Based on Response-Surface Method to Optimize Lining of Dies Used in 3D Free-Bending Forming Technology

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Chinese Journal of Mechanical engineering 2024年第5期37卷 307-331页

作者： Cheng Cheng Jiaxin Guo Ali Abd El‑Aty Jie Tao Xunzhong Guo College of Material Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211100China Avic Taiyuan Aero-Instruments Co. LtdTaiyuan 030000China Department of Mechanical Engineering College of EngineeringAl Kharj Prince Sattam Bin Abdulaziz UniversityAl Kharj 11942Saudi Arabia Mechanical Engineering Department Faculty of EngineeringHelwan UniversityCairo 11795Egypt

In three-dimensional free-bending forming(3D-FBF),the tube is not overly constrained,and the plastic deformation behavior and forming quality of the bent tube are significantly affected by the critical structure of the forming die ***,the effects of die-lining structural parameters on the tube quality,and a method to determine the combination of die-lining structural parameters is yet to be *** study aims to propose a new framework that allows one to understand the effects of various die-lining structural parameters on tube quality and to propose the best combination of die-lining structural ***,finite-element modeling is performed to simulate 3D-FBF and examine the effects of individual die-lining structures on the quality of tube *** simulation results show that the deformation-zone length and die gap are positively correlated with the tube-section distortion and wall-thickness variation,whereas it shows an opposite trend with respect to the bending ***,the lining chamfer radius of the bending die and the guide lining chamfer radius minimally affect the tube forming ***,the optimal die-lining structure is obtained using the response-surface *** tube cross-sectional distortion rate reduced from 2.73 to 2.53%after the die lining is ***,the average inner-wall thickness reduced to 1.06 mm,whereas the average outer-wall thickness increased to 0.97 *** paper proposes a method for optimizing the forming-die-lining mechanism and for improving the tube forming quality in 3D-FBF.

关键词： Die lining Forming quality Response surface method Cross-sectional distortion Wall thickness

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Effect of chemical composition and microstructure on the thermal conductivity of Mg-Al-Ca alloys

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Keikinzoku/Journal of Japan Institute of Light Metals 2024年第1期74卷 9-13页

作者： Kirimoto, Yuichi Kondo, Natsuki Ito, Mizuki Tsukeda, Tadayoshi Aida, Tetsuo Tabata, Hironobu Kurihara, Hideki Suzuki, Mayumi Department of Nano and Functional Material Science Graduate School of Science and Engineering for Education University of Toyama 3190 Gofuku Toyama-shi Toyama930-8555 Japan School of Sustainable Design Materials and Engineering University of Toyama Toyama-shi Toyama Japan Program of Materials Science and Engineering Studies in Science and Engineering Graduate School of Science and Engineering University of Toyama Toyama-shi Toyama Japan Faculty of Sustainable Design Academic Assembly University of Toyama Toyama-shi Toyama Japan CHUETSU METAL WORKS CO. LTD. Nakaniikawa-gun Toyama Japan Saitama Industrial Technology Center Kawaguchi-shi Saitama Japan Department of Mechanical Systems Engineering Faculty of Engineering Toyama Prefectural University Imizu-shi Toyama Japan

In recent years, the increasing demand for electric vehicles, digital devices such as PCs and smartphones, and renewable energy storage systems has created a need for higher-performance batteries. Accordingly, the thermal conductivity of the case that houses the battery is becoming increasingly important. In this study, compositions with high thermal conductivity and good castability were investigated, focusing on Mg-Al-Ca alloys, and the relationship between the two was examined through thermal conductivity measurements and microstructural observations. As a result, the Mg-6%Al-4%Ca alloy was optimal in terms of castability and thermal conductivity. It was confirmed that a lower Al solid solution capacity and a higher purity of the matrix phase are important to improve the thermal conductivity. It is also suggested that the second phase, platelet Al2Ca, is likely to be recognized and enriched in the matrix, contributing to the improvement of thermal conductivity. The amount of Ca solid solution in the matrix was suggested to be reduced by the enrichment of Al in the matrix. The Ca solid solution in the matrix was found to be less effective in reducing thermal conductivity than the Al solid solution. © 2024 The Japan Institute of Light Metals.

关键词： Magnesium alloys

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High ion-conductive cellulose-based solid-state electrolyte membrane by double modifications with zwitterionic sulfonate betaine and metal ions

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Journal of Molecular Structure 2025年 1342卷

作者： Lv, An Hou, Hongying Liu, Xianxi Chen, Jinlong Wang, Yupeng Niu, Yutao Yu, Xiaohua Rong, Ju Faculty of Material Science and Engineering Kunming University of Science and Technology Kunming650093 China Faculty of Mechanic and Electronic Engineering Kunming University of Science and Technology Kunming650093 China

Solid-state electrolytes have garnered much significant attention due to their exceptional safety and high energy density. Meanwhile, they also encounter with some challenges of low Li+ transference number and ionic conductivity. Herein, high ion-conductive cellulose-based solid-state electrolyte membranes (CL@SB/LiTFSI-Cu and CL@SB/LiTFSI-Fe) are designed and prepared by double strategies of chemically grafting zwitterionic sulfonate betaine (SB) and combining with metal ions (Cu2+, Fe3+), in which sulfonate betaine (SB) facilitates the dissociation of LiTFSI and provides more active site and more free Li+, while the complex of metal ions (Cu2+ or Fe3+) expands the free space among the polymer chains and Li+ migration channels. In detail, according to density functional theory (DFT) calculation, the distances between carbon atoms in the cellulose increases from 2.66 Å to 5.48 Å and 4.82 Å, after combining with Cu2+ and Fe3+ respectively. Desirably, the cellulose-based solid state electrolyte membrane combining with Cu2+ delivers higher over-all performances than the counterpart with Fe3+, which may be attributed to larger ion radius and more quantity of Cu2+ with lower valence. Specifically, Li+ transference number, room temperature ionic conductivity and electrochemical stability window of CL@SB/LiTFSI-Cu membrane are as high as 0.63, 3.58 × 10–4 S·cm-1 and 5.0 V, respectively. Furthermore, the initial discharge capacity of LiFePO4//CL@SB/LiTFSI-Cu//Li battery is 141.2 mAh·g-1 at 1.0 C with high capacity retention of 90.8 % after 250 cycles, indicating more promising application feasibility for the solid-state lithium metal battery. © 2025

关键词： Solid-State Batteries

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