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Effect of Alloying Elements(Sb,B) on Recrystallization and Oxidation of Mn-Containing IF Steel

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Journal of Iron and Steel research International 2013年第3期20卷 39-44,56页

作者： ZHANG Ya-long ZHANG Ying-yi YANG Fei-hua ZHANG Zuo-tai Department of Energy and Resources engineering College of EngineeringPeking University Beijing Building materials Academy of Sciences research

The effects of minor alloying elements（antimony,boron） on the recrystallization and oxidation of Mn-containing interstitial free（IF） steels were investigated using confocal scanning laser microscope（CSLM） under controlled atmosphere of 95% Ar and 5% H2（volume percent） at different *** results indicated that oxidation and recrystallization were primarily controlled by the grain boundaries,which moved due to release of the stored energy or acted as the fast path diffusion of alloying *** was found that the addition of antimony suppressed both surface oxidation and internal oxidation,whereas boron addition accelerated surface oxidation but decreased internal *** reasons caused were that the alloying elements of antimony or boron were known to segregate on the surfaces or grain boundaries to occupy the surface adsorption sites,which were expected to be less catalytic than bare iron on the transportation of alloying *** recrystallization was also retarded through adding minor antimony and boron *** oxidation kinetics of formation of grain boundary oxides were studied through calculating the areas along grain boundaries,and it was found that the areas parabolically increased with increasing time.

关键词： IF steel boron antimony oxidation recrystallization

Enhanced age-hardening behavior in Al–Cu alloys induced by in-situ synthesized TiC nanoparticles

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Journal of materials Science & Technology 2019年第3期35卷 374-382页

作者： Huabing Yang Tong Gao Huaning Zhang Jinfeng Nie Xiangfa Liu Key Laboratory for Liquid-Solid Structural Evolution and Processing of materials Ministry of Education Shandong University Nano Structural materials center School of Materials Science and Engineering Nanjing University of Science and Technology

The influence of in-situ synthesized TiC nanoparticles on age-hardening behavior of Al–Cu alloys was investigated in Al–4.5 Cu–1.5 TiC alloy. It was found that TiC nanoparticles decrease the peak-age time effectively, from about 20 h for Al–4.5 Cu alloy decreasing to about 12 h for the Al–4.5 Cu–1.5 TiC. Mechanical property test shows that the age-hardening effect has been improved by the TiC nanoparticles. The increment of yield strength before and after aging is about 84 MPa for Al–4.5 Cu, while, it reaches to about113 MPa for the Al–4.5 Cu–1.5 TiC. After aging heat treatment, precipitates have been observed both in matrix and around TiC nanoparticles. Due to the difference of coefficient of thermal expansion between TiC and Al, high density dislocations in the Al–4.5 Cu–1.5 TiC were generated during water quenching after solution. Dislocations play a role of diffusion path for Cu atoms during aging, which reduces the peak-age time. Alpha-Al lattice distortion resulted from lattice mismatch of TiC/Al interface induces the precipitation of θ' phase around TiC nanoparticles, which increases the number density of θ' and improves the age-hardening effect. This finding is supposed to be also applicable to alloy systems of Al–Cu–Mg,Al–Cu–Mg–Li, Al–Cu–Mg–Ag, etc.

关键词： Al–Cu alloy TiC nanoparticles θ’ precipitation Age-hardening Mechanical property

Sulfate Ions Immobilization of Calcined Layered Double Hydroxides in Hardened Cement Paste and Concrete

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Journal of Wuhan University of Technology(materials Science) 2019年第6期34卷 1400-1407页

作者： MA Juntao WANG Daguang DUAN Ping SHI Yanke MWR center for Levee Safety and Disease Prevention research Yellow River Institute of Hydraulic ResearchZhengzhou 450003China International Joint research Lab for Eco-building materials and engineering of Henan North China University of Water Resources and Electric PowerZhengzhou 450045China engineering research center of Nano-Geomaterials of Ministry of Education Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan 430074China State Key Laboratory of Silicate materials for Architectures Wuhan University of TechnologyWuhan 430070China

The sulfate ions immobilization behavior of calcined layered double hydroxides(CLDHs) in the hardened cement paste was investigated. The experimental results show that the sulfate ions in cement paste are immobilized by CLDHs to reconstruct the layered structure and aggregate around CLDHs. The immobilization amount of sulfate ions by CLDHs reaches 4.74×10^-3 mol/g, while the increasing amount indicates non-linear relation with the addition of CLDHs. The incorporation of CLDHs decreases the amount of ettringite formed to limit the expansion of cement paste, which decays the sulfate reaction to enhance the sulfate resistance of concrete.

关键词： calcined layered double hydroxides(CLDHs) sulfate ions immobilization hardened cement paste

research progress of catalysts for direct coal liquefaction

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Journal of Energy Chemistry 2025年第1期100卷 481-497页

作者： Wei Song Penggao Liu Xinyue Chen Ting Wang Chunrong He Rui Hao Kaiyu Liu State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources College of Chemistry Xinjiang University College of Chemistry and Chemical engineering Henan Polytechnic University Hunan Provincial Key Laboratory of Chemical Power Sources College of Chemistry and Chemical Engineering Central South University

Coal direct liquefaction technology is a crucial contemporary coal chemical technology for efficient and clean use of coal resources. The development of direct coal liquefaction technology and the promotion of alternative energy sources are important measures to guarantee energy security and economic security. However, several challenges need to be addressed, including low conversion rate, inadequate oil yield, significant coking, demanding reaction conditions, and high energy consumption. Extensive research has been conducted on these issues, but further exploration is required in certain aspects such as pyrolysis of macromolecules during the liquefaction process, hydrogen activation, catalysts' performance and stability, solvent hydrogenation, as well as interactions between free radicals to understand their mechanisms better. This paper presents a comprehensive analysis of the design strategy for efficient catalysts in coal liquefaction, encompassing the mechanism of coal liquefaction, catalyst construction,and enhancement of catalytic conversion efficiency. It serves as a comprehensive guide for further research endeavors. Firstly, it systematically summarizes the conversion mechanism of direct coal liquefaction, provides detailed descriptions of various catalyst design strategies, and especially outlines the catalytic mechanism. Furthermore, it addresses the challenges and prospects associated with constructing efficient catalysts for direct coal liquefaction based on an understanding of their action mechanisms.

关键词： Direct coal liquefaction Catalysts Mechanism of action Solvent hydrogenation

N-doped defective carbon with trace Co for efficient rechargeable liquid electrolyte-/all-solid-state Zn-air batteries

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Science Bulletin 2018年第9期63卷 548-555页

作者： Zhiyan Chen Qichen Wang Xiaobin Zhang Yongpeng Lei Wei Hu Yao Luo Yaobing Wang College of materials Science and engineering Central South University of Forestry and Technology State Key Laboratory for Modification of Chemical Fibers and Polymer materials Donghua University center for Nano materials and Technology Japan Advanced Institute of Science and Technology School of Aeronautics and Astronautics & Science and Technology on High Strength Structural materials Laboratory Central South University College of Basic Education National University of Defense Technology Design and Assembly of functional Nanostructures Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences

Simple synthesis of multifunctional electrocatalysts with plentiful active sites from earth-abundant materials is especially fascinating. Here, N-doped defective carbon with trace Co （1.5 wt%） was prepared via a scalable one pot solid pyrolysis process. The sample exhibits efficient bifunctional OER/ORR activiW in alkaline, mainly ascribed to the unique micro-mesoporous structure （1-3 nm）, high population of graphitic-N doping （up to 49.0%）, abundant defects and the encapsulated Co nanoparticles with graphitized carbon. The according rechargeahle liquid Zn-air batteries showed excellent performance （maximum power density of 154.0 mWcm-2： energy density of 773Wh kg -1 at 5 mAcm 2 and charging-discharging cycling stability over 100 cycles）. As a proof-of-concept, the flexible, rechargeable all-solid-state Zn-air batteries were constructed, and displayed a maximum power density as high as 45.9 mW cm 2 among the top level of those reported previously.

关键词： Defect Oxygen electrocatalysts Rechargeable all-solid-state batteries

Phase-field-crystal simulation of nano-single crystal microcrack propagation under different orientation angles

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Chinese Physics B 2023年第4期32卷 443-451页

作者：彭敦维张云鹏田晓林侯华赵宇宏 School of materials Science and engineering Xi’an University of TechnologyXi’an 710048China School of materials Science and engineering North University of ChinaTaiyuan 030051China School of materials Science and engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Beijing Advanced Innovation center for materials Genome engineering University of Science and Technology BeijingBeijing 100083China

The propagation mechanism of microcracks in nanocrystalline single crystal systems under uniaxial dynamic and static tension is investigated using the phase-field-crystal *** dynamic and static stretching results show that different orientation angles can induce the crack propagation mode,microscopic morphology,the free energy,crack area change,and causing fracture *** propagation mode depends on the dislocation activity near the crack *** propagation of the crack occurs due to dislocation always at crack *** is emitted at the front end of the crack tip and plastic deformation occurs,which belongs to ductile *** orientation angles of 9°and 14°are brittleductile mixed propagation,while the orientation angles of 19°and 30°are brittle propagation and no dislocation is formed under dynamic *** vacancy and vacancy connectivity phenomenon would appear when the orientation angle is14°under static tension,and the crack would be ductile *** the orientation angle is 19°and 30°,the crack propagates in a certain direction,which is a kind of brittle *** work has some practical significance in preventing material fracture failure and improving material performance.

关键词： phase-field-crystal microcrack orientation angle crack propagation

Effect of gradient microstructure on the bendability of AZ31 alloy sheet

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Journal of materials Science & Technology 2024年第11期178卷 143-154页

作者： Lintao Liu Jieyu Li Shengwen Bai Bin Jiang Chao He Jianxin Zhou Guangsheng Huang Dingfei Zhang Fusheng Pan National engineering research center for Magnesium Alloys Chongqing UniversityChongqing 400044China College of materials Science and engineering Chongqing UniversityChongqing 400044China Chongqing Academy of Science and Technology Chongqing 401123China

Extensive researches have elucidated the pronounced benefits of gradient microstructures for the me-chanical properties of metallic ***,the ramifications of gradient microstructures on formability,particularly regarding their effects on bendability,remain inadequately *** this work,the effects of gradient microstructure on the bendability of AZ31 Mg alloy sheet are systematically investigated by comparing the microstructure evolution and strain distribution in the sheets with uni-form microstructure(grain size=12.8 μm and 91.3 μm)and gradient microstructure(grain size=11.5-75.4 μm).The results show that the bendability of the sheet with gradient microstructure is significantly improved when the fine grains(FGs)are placed at the outer side(TBE-FG sample)and the bendability is increased by 93.1%compared to the sample with fine and uniform microstructure(CE-FG sample).With coarse grains(CGs)placed at the inner side,the strain at the compressive region of the TBE-FG sample is higher than its counterparts,while the tensile strain at the extended region is lowest among the four ***-in-situ bending experiments reveal that the CGs at the inner side of the TBE-FG sample undergo more ***,the increment of residual dislocation density at the outer side of the TBE-FG sample is lower than those of other samples,which extends the bending *** work provides a novel perspective to improve the bendability of the Mg alloy sheet.

关键词： Gradient microstructure Bendability Strain distribution Quasi-in-situ bending

Biocatalytic enhancement of laccase immobilized on ZnFe_(2)O_(4) nanoparticles and its application for degradation of textile dyes

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Chinese Journal of Chemical engineering 2024年第4期68卷 216-223页

作者： Yuhang Wei Qingpeng Zhu Weiwei Xie Xinyue Wang Song Li Zhiming Chen School of Chemical and Environmental engineering Anhui Laboratory of Functional Coordinated Complexes for Materials Chemistry and ApplicationAnhui Polytechnic UniversityWuhu 241000China School of Biology and Food engineering Anhui Polytechnic UniversityWuhu 241000China

Efficient and convenient treatment of industrial dyeing wastewater is of great significance to guarantee human and animal *** work presented the enhanced catalytic activity at pH 3.0 of laccase immobilized on amino-functionalized ZnFe_(2)O_(4) nanoparticles(ZnFe_(2)O_(4)-laccase)and its application for the degradation of textile *** to the existence of a large number of oxygen vacancies on the surface of the ZnFe_(2)O_(4) nanoparticles,negative ions accumulated on the magnetic carriers,which resulted in a harsh optimal pH value of the ZnFe_(2)O_(4)-*** activity assays revealed that the ZnFe_(2)O_(4)-laccase possessed superior pH and thermal stabilities,excellent reusability,and noticeable organic solvent ***,the ZnFe_(2)O_(4) laccase presented efficient and sustainable degradation of high concentrations of textile *** initial decoloration efficiencies of malachite green(MG),brilliant green(BG),azophloxine,crystal violet(CV),reactive blue 19(RB19),and procion red MX-5B were approximately 99.1%,95.0%,93.3%,87.4%,86.1%,and 85.3%,*** 10 consecutive reuses,the degradation rates of the textile dyes still maintained about 98.2%,92.5%,83.2%,81.5%,79.8%and 65.9%,*** excellent dye degradation properties indicate that the ZnFe_(2)O_(4)-laccase has a technical application in high concentrations of dyestuff treatment.

关键词： ZnFe_(2)O_(4)-laccase Catalytic activity Stability and reusability Degradation of textile dye

Structure,Texture and Magnetic Properties of Laser-Welded Ultrathin Fe-Co-V Foils

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Acta Metallurgica Sinica(English Letters) 2015年第3期28卷 338-347页

作者： Hossein Mostaan Morteza Shamanian Seyed Mahmoud Monirvaghefi Peiman Behjati Jerzy A.Szpunar Morteza Amiri Mashallah Fathi Moghadam Department of materials engineering Isfahan University of Technology Department of Mechanical engineering University of Saskatchewan Department of materials engineering Yazd University Department of materials Science and engineering Sharif University of Technology

This research aims to investigate the effect of pulsed Nd：YAG laser micro-welding on the microstructure,texture and magnetic properties of ultra-thin Fe-Co-7.15 wt%V magnetic *** microscopy,scanning electron microscopy and electron backscattered diffraction techniques were used to study the microstructural ***,vibrating sample magnetometry was used to characterize the magnetic *** results showed that the fractions of low Σ coincidence site lattice boundaries in the fusion zone are higher than those of the base *** welded samples experience a significant decrease in their magnetic *** was found that the formation of new fiber texture in the fusion zone and grain coarsening are the most important factors affecting the magnetic properties.

关键词： Magnetic properties Ultra-thin magnetic foils Texture analysis EBSD study Nd:YAG laser micro-welding