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An ionic liquid-assisted strategy for enhanced anticorrosion of low-energy PEO coatings on magnesium-lithium alloy

JOURNAL OF MAGNESIUM AND ALLOYS 2024年第6期12卷 2380-2396页

作者： Zhang, You Chen, Chuping Tian, Haoyue Wang, Shuqi Wen, Chen Chen, Fei beijing inst Petrochem technol Coll New Mat & Chem Engn Hydrogen Energy Res Ctr Beijing 102617 Peoples R China Harbin inst technol Key Lab Adv Struct Funct Integrated Mat & Green Mf Harbin 150001 Peoples R China China Acad Space technol Beijing Spacecrafts Beijing 100190 Peoples R China

A low-energy plasma electrolytic oxidation (LePEO) technique is developed to simultaneously improve energy efficiency and anti-corrosion. Ionic liquids (1-butyl-3-methylimidazole tetrafluoroborate (BmimBF 4 )) as sustainable corrosion inhibitors are chosen to investigate the corrosion inhibition behavior of ionic liquid (ILs) during the LePEO process for LA91 magnesium-lithium (Mg-Li) alloy. Results show that the ionic liquid BmimBF 4 participates in the LePEO coating formation process, causing an increment in coating thickness and surface roughness. The low conductivity of the ionic liquid is responsible for the voltage and breakdown voltage increases during the LePEO with IL process (LePEO-IL). After adding BmimBF 4 , corrosion current density decreases from 1.159 x 10 - 4 A cm - 2 to 8.143 x 10 - 6 A cm - 2 . The impedance modulus increases to 1.048 x 10 4 Q cm - 2 and neutral salt spray remains intact for 24 h. The superior corrosion resistance of the LePEO coating assisted by ionic liquid could be mainly attributed to its compact and thick barrier layer and physical absorption of ionic liquid. The ionic liquid-assisted LePEO technique provides a promising approach to reducing energy consumption and improving film performance. (c) 2023 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license ( http://***/licenses/by-nc-nd/4.0/ ) Peer review under responsibility of Chongqing University

关键词： Magnesium-lithium alloy Plasma electrolytic oxidation Low energy Ionic liquid Corrosion resistance. CORROSION-RESISTANCE OXIDATION COATINGS MICROARC OXIDATION COPPER CORROSION INHIBITION PHOSPHATE MICROSTRUCTURE DERIVATIVES SILICATE

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Effects of deformation temperatures on microstructures, aging behaviors and mechanical properties of Mg-Gd-Er-Zr alloys fabricated by hard-plate rolling

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JOURNAL OF MAGNESIUM AND ALLOYS 2024年第6期12卷 2345-2359页

作者： Liu, Ke Hu, Dalong Lou, Feng Yu, Zijian Li, Shubo Du, Xian Du, Wenbo beijing Univ technol Fac Mat & Mfg Beijing 100124 Peoples R China

In this investigation, a high-strength Mg-12Gd-1.0Er-0.5Zr (wt.%) alloy sheet was produced by hot extrusion (HE) and subsequent hardplate rolling (HPR) at different temperatures. The results indicate that the microstructures of these final-rolled sheets are inhomogeneous, mainly including coarse deformed grains and dynamic recrystallized (DRXed) grains, and the volume fraction of these coarse deformed grains increases as the rolling temperature increases. Thus, more DRXed grains can be found in R-385 degrees C sheet, resulting in a smaller average grain size and weaker basal texture, while the biggest grains and the highest strong basal texture are present in R-450 degrees C sheet. Amounts of dynamic precipitation of beta phases which are mainly determined by the rolling temperature are present in these sheets, and its precipitation can consume the content of Gd solutes in the matrix. As a result, the lowest number density of beta phase in R-450 degrees C sheet is beneficial to modify the age hardening response. Thus, the R-450 degrees C sheet displays the best age hardening response because of a severe traditional precipitation of beta' (more) and beta H / beta M (less) precipitates, resulting in a sharp improvement in strength, i.e. ultimate tensile strength (UTS) of - 518 +/- 17 MPa and yield strength (YS) of - 438 +/- 18 MPa. However, the elongation (EL) of this sheet reduces greatly, and its value is - 2.7 +/- 0.3%. By contrasting, the EL of the peak-aging R-385 degrees C sheet keeps better, changing from - 4.9 +/- 1.2% to - 4.8 +/- 1.4% due to a novel dislocation-induced chain-like precipitate which is helpful to keep good balance between strength and ductility. (c) 2022 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license ( http://***/licenses/by-nc-nd/4.0/ ) Peer review under responsibility of Chongqing University

关键词： Mg-Gd-Er-Zr sheets Age hardening response Precipitates Mechanical properties ULTRA-HIGH-STRENGTH MAGNESIUM ALLOYS TENSILE PROPERTIES WT.PERCENT ALLOY PRECIPITATION EVOLUTION DUCTILITY DISLOCATIONS EXTRUSION PHASES

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Evolution and control of inclusions of Ti-bearing ultra-low carbon steel during the steelmaking process

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PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL 2024年第3期34卷 585-590页

作者： Ma, Wenjun Chen, Bin Li, Haibo Hao, Lixia Chen, Jianguan Jia, Yi Liu, Daozheng Shougang Res inst technol Room 110769Yangzhuang RdShijingshan Dist Beijing 100043 Peoples R China beijing Shougang co ltd Room 606 Qianan 064404 Peoples R China

This article investigates the evolution and control of inclusions in the smelting process of titanium containing ultra-low carbon steel. Through industrial experiments, the influence of oxygen content before aluminum addition on inclusions in ultra-low carbon IF steel was explored, and the evolution process of inclusions was studied. The microstructure of different types of inclusions was observed using three-dimensional analysis techniques. Research has found that the oxygen content before aluminum addition has no significant effect on the final oxygen content. However, under low aluminum and low oxygen conditions, the size of inclusions formed is small and difficult to float and remove. Even if the cycle time is extended, the AF index of inclusions remains at a high level. Through three-dimensional morphology analysis of inclusions, it was found that alumina formed under high aluminum and high oxygen conditions is very dense, while inclusions are relatively loose under low aluminum and low oxygen conditions. In addition, through the analysis of aluminum oxygen supersaturation before the formation of aluminum oxide inclusions, it was found that due to the low oxygen content, the nucleation rate of aluminum oxide in the early stage of inclusion formation is relatively low, and the inclusions grow along the trajectory of oxygen, ultimately forming polycrystalline aluminum oxide inclusions. This article also observed for the first time the initial three-dimensional morphology of Al Ti inclusions, providing a theoretical basis for further optimizing smelting processes and controlling inclusions.

关键词： Inclusions Ultra-low carbon steel Steelmaking process Morphology of Al2O3 TiOx complex oxide Al2O3 cluster

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Mechanism of slag pellets sticking on the wall of reduction pot in magnesium production by Pidgeon process

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JOURNAL OF MAGNESIUM AND ALLOYS 2024年第6期12卷 2397-2412页

作者： Xu, Jilei Liu, Jinhui Guo, Dong Chen, Mao Yang, Peixu Li, Rongbin Zhang, Shaojun Zhengzhou Univ Sch Mat Sci & Engn Zhengzhou 450001 Peoples R China Zhengzhou Univ Henan Prov Ind Technol Res Inst Resources & Mat Zhengzhou 450001 Peoples R China Univ Sci & technol beijing Sch Met & Ecol Engn Beijing 100083 Peoples R China

In the preparation of magnesium by Pidgeon process, the phenomenon slag pellets sticking on the wall of reduction pot always appear, and the glaze sticking on the inner wall of the reduction pot is difficult to remove. The mechanism of this phenomenon is studied in this work by X-ray fluorescence spectrometer (XRF) measurement, electron probe microanalyzer scanning (EPMA) analysis, differential scanning calorimetry (DSC) analysis, and thermodynamic calculations. The main components of the glaze are MgO, Ca12 Al14 F2 O32 , CaF2 , CaO, and a small amount of Ca4 Si2 O7 F2 . The solid-liquid transition temperature of Ca12 Al14 F2 O32 and CaF2 is close to the production temperature of Pidgeon process, which leads to the bonding between the slag pellets and the pot wall. The loss of CaF2 in glaze layer will reduce the total amount of liquid phase and increase the temperature at which Ca12 Al14 F2 O32 is completely transformed into liquid phase, which causes glaze layer sticking on the inner wall of the reduction pot. (c) 2022 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license ( http://***/licenses/by-nc-nd/4.0/ ) Peer review under responsibility of Chongqing University

关键词： Pidgeon process Glaze Ca 12 Al 14 F 2 O 32 CaF 2 Solid-liquid transition SILICOTHERMIC REDUCTION THERMAL-CONDUCTIVITY HEAT-TRANSFER FLUORINE CAO-SIO2-CAF2 IMPACT MG

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Synergy of inside doped metals-Outside coated graphene to enhance hydrogen storage in magnesium-based alloys

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JOURNAL OF MAGNESIUM AND ALLOYS 2024年第6期12卷 2462-2471页

作者： Zhang, Kun Chang, Yu Lei, Jingjing Chen, Jing Si, Tingzhi Ding, Xiaoli Cui, Ping Li, Hai-Wen Zhang, Qingan Li, Yongtao Anhui Univ technol Sch Mat Sci & Engn Maanshan 243002 Anhui Peoples R China Anhui Univ technol Key Lab Green Fabricat & Surface Technol Adv Met M Minist Educ Maanshan 243002 Peoples R China Tsinghua Univ Inst Nucl & New Energy Technol Beijing 100084 Peoples R China Hefei Gen Machinery Res inst Hefei 230031 Anhui Peoples R China

Grain growth of magnesium (Mg) and its hydride is one of the main reasons for kinetic and capacity degradation during the hydrogen absorption and desorption cycles. To solve this problem, herein we propose a novel method involving synergistic effect of inside embedded metals and outside coated graphene to limit the growth of Mg and its hydride grains. The graphene coated Mg-Y-Al alloys were selected as a model system for demonstrating this positive effect where the Mg91 Y3 Al6 alloy was first prepared by rapidly solidified method and then high-pressure milled with 5 wt% graphene upon 5 MPa hydrogen gas for obtaining in-situ formed YAl2 and YH3 embedded in the MgH2 matrix with graphene shell (denoted as MgH2 -Y-Al@GR). In comparison to pure MgH2 , the obtained MgH2 -Y-Al@GR composites deliver much better kinetics and more stable cyclic performance. For instance, the MgH2 -Y-Al@GR can release about 6.1 wt% H2 within 30 min at 300 degrees C but pure MgH2 only desorbs -1.5 wt% H2 . The activation energy for desorption of MgH2 -Y-Al@GR samples is calculated to be 75.3 +/- 9.1 kJ/mol that is much lower than approximately 160 kJ/mol for pure MgH2 . Moreover, its capacity retention is promoted from -57% of pure MgH2 to -84% after 50th cycles without obvious particle agglomeration and grain growth. The synergistic effect of outside graphene coating with inside embedded metals which could provide a huge number of active sites for catalysis as well as inhibit the grain growth of Mg and its hydride is believed to be responsible for these. (c) 2024 Chongqing University. Publishing services provided by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license ( http://***/licenses/by-nc-nd/4.0/ ) Peer review under responsibility of Chongqing University

关键词： Energy Hydrogen storage Mg alloys Synergy effect. SORPTION PERFORMANCE HYDRIDE SYSTEM MGH2

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Introduction to the Special Issue on Machine Learning-Guided Intelligent Modeling with Its Industrial Applications

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CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES 2024年第10期141卷 7-11页

作者： Luo, Xiong Cheng, Yongqiang Liao, Zhifang Univ Sci & technol beijing Sch Comp & Commun Engn Beijing 100083 Peoples R China Univ Sunderland Fac Technol Sunderland SR6 0DD England Cent South Univ Sch Comp Sci & Engn Changsha 410083 Peoples R China

With the advancement of Artificial Intelligence(AI)technology,traditional industrial systems are undergoing an intelligent transformation,bringing together advanced computing,communication and control technologies,Machine Learning(ML)-based intelligentmodelling has become a newparadigm for solving problems in the industrial domain[1–3].With numerous applications and diverse data types in the industrial domain,algorithmic and data-driven ML techniques can intelligently learn potential correlations between complex data and make efficient decisions while reducing human ***,in real-world application scenarios,existing algorithms may have a variety of limitations,such as small data volumes,small detection targets,low efficiency,and algorithmic gaps in specific application domains[4].Therefore,many new algorithms and strategies have been proposed to address the challenges in industrial applications[5–8].

关键词： Intelligence bringing intelligent

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Medcheck: a novel software for automated de-formulation of traditional Chinese medicine (TCM) prescriptions by liquid chromatography-mass spectrometry

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JOURNAL OF PHARMACEUTICAL ANALYSIS 2024年第6期14卷 100958页

作者： Li, Xiao-lan Zhang, Jian-qing Li, Yun Shen, Xuan-jing Yang, Huan-ya Yang, Lin Xu, Meng Bi, Qi-rui Yao, Chang-liang Guo, De-an Chinese Acad Sci Shanghai Inst Mat Med Natl Engn Res Ctr TCM Standardizat Technol Shanghai Res Ctr Modernizat Tradit Chinese Med Shanghai 201203 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China

Image 1.

关键词： medicines formulation prescription

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Highly Thermally Conductive and Structurally Ultra‑Stable Graphitic Films with Seamless Heterointerfaces for Extreme Thermal Management

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Nano-Micro Letters 2024年第3期16卷 383-397页

作者： Peijuan Zhang Yuanyuan Hao Hang Shi Jiahao Lu Yingjun Liu Xin Ming Ya Wang Wenzhang Fang Yuxing Xia Yance Chen Peng Li Ziqiu Wang Qingyun Su Weidong Lv Ji Zhou Ying Zhang Haiwen Lai Weiwei Gao Zhen Xu Chao Gao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringKey Laboratory of Adsorption and Separation Materials and Technologies of Zhejiang ProvinceZhejiang University38 Zheda RoadHangzhou 310027People’s Republic of China Shanxi-Zheda institute of Advanced Materials and Chemical Engineering Taiyuan 030032People’s Republic of China beijing Spacecrafts Manufacturing Co. LtdBeijing Friendship Road 104Haidian DistrictBeijing 100094People’s Republic of China beijing institute of Space Mechanics and Electricity Beijing Friendship Road 104Haidian DistrictBeijing 100094People’s Republic of China China Academy of Aerospace Aerodynamics Beijing 100074People’s Republic of China Hangzhou Gaoxi technol Co. LtdHangzhou 311113People’s Republic of China International Research Center for X Polymers International CampusZhejiang UniversityHaining 314400People’s Republic of China

Highly thermally conductive graphitic film(GF)materials have become a competitive solution for the thermal management of high-power electronic ***,their catastrophic structural failure under extreme alternating thermal/cold shock poses a significant challenge to reliability and ***,we present the first investigation into the structural failure mechanism of GF during cyclic liquid nitrogen shocks(LNS),which reveals a bubbling process characterized by“permeation-diffusion-deformation”*** overcome this long-standing structural weakness,a novel metal-nanoarmor strategy is proposed to construct a Cu-modified graphitic film(GF@Cu)with seamless *** well-designed interface ensures superior structural stability for GF@Cu after hundreds of LNS cycles from 77 to 300 ***,GF@Cu maintains high thermal conductivity up to 1088 W m^(−1)K^(−1)with degradation of less than 5%even after 150 LNS cycles,superior to that of pure GF(50%degradation).Our work not only offers an opportunity to improve the robustness of graphitic films by the rational structural design but also facilitates the applications of thermally conductive carbon-based materials for future extreme thermal management in complex aerospace electronics.

关键词： Highly thermally conductive Structurally ultra-stable Graphitic film Extreme thermal management Liquid nitrogen bubbling

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Real-time identification of multiple nanoclusters with a protein nanopore in single-cluster level

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Nano Research 2024年第1期17卷 262-269页

作者： Ling Zhang Peilei He Huang Chen Qingda Liu Libo Li Xun Wang Jinghong Li Department of Chemistry Center for BioAnalytical ChemistryKey Laboratory of Bioorganic Phosphorus Chemistry&Chemical BiologyTsinghua UniversityBeijing 100084China School of Chemistry and Chemical Engineering Guangdong Prov Key Lab Green Chem Prod TechnolSouth China University of TechnologyGuangzhou 510640China New Cornerstone Science Laboratory Shenzhen 518054China beijing institute of Life Science and technology Beijing 102206China Center for BioAnalytical Chemistry Hefei National Laboratory of Physical Science at MicroscaleUniversity of Science and Technology of ChinaHefei 230026China

It is important and challenging to analyze nanocluster structure with atomic ***,α-hemolysin nanopore was used to identify nanoclusters at the single molecule level by providing two-dimensional(2D)dwell time–current blockage spectra and translocation event frequency which sensitively depended on their *** such as Anderson,Keggin,Dawson,and a few lacunary Dawson polyoxometalates with very similar structures,even with only a two-atom difference,could be *** nanopore device could simultaneously measure multiple nanoclusters in a mixture qualitatively and ***,molecular dynamics(MD)simulations provided microscopic understandings of the nanocluster translocation dynamics and yielded 2D dwell time–current blockage spectra in close agreement with *** nanopore platform provides a novel powerful tool for nanocluster characterization.

关键词： nanopore single-molecule nanocluster polyoxometalates real-time detection

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A muon high-resolution pseudorange measurement method: Application to muon navigation in confined spaces

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Chinese Journal of Aeronautics 2024年第4期37卷 391-404页

作者： Haoyang LI Chunxi ZHANG Xingming FAN Longjie TIAN Tianqi LI Yang PANG Yanqiang YANG institute of Optics and Electronics School of Instrumentation Science and Optoelectronics EngineeringBeihang UniversityBeijing 100191China institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China

Confined spaces such as polar regions, deep earth and deep ocean are crucial navigation scenarios where traditional navigation techniques have difficulty in obtaining external signals for positioning. The cosmic ray muons, which carry the spatial and energetic information, are easy to penetrate these confined spaces. Therefore, the unique muon characteristic provides a new perspective to estimate detector position, which can be considered using in confined spaces *** this paper, a well-developed theory of muon navigation is established by combining a muon pseudorange measurement method. Moreover, an Equivalent Velocity Calculation Model(EVCM)and a Muon Sequence Matching technology(MSMT) are proposed. The first model corrects flight pseudorange error caused by the relativistic energy loss and the second technology compensates the random error in pseudorange measurement. Further, a series of simulations are performed to analyze the muon events number which can be received by detector in different scenarios with the variations of zenith angle, detector area, varied detector plates gap, and muon flight ***, the simulation results demonstrate that the muon navigation update rate every 10 minutes can reach 5.989 in confined spaces at 100 m, and further pseudorange error analysis indicates that the meter-level positioning accuracy can be acquired. Finally, we construct a muon coincidence measurement scheme and verify that the laws of the muon positioning system for high-energy muons are consistent with the simulation results.

关键词： Muon navigation Cosmic ray muons Muon detection technology Muon transmission technology Pseudorange measurement

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