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Thermodynamic descriptions of quaternary Mg-Al-Zn-Bi system supported by experiments and their application in descriptions of solidification behavior in Bi-additional AZ casting alloys

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Journal of Magnesium and Alloys 2020年第4期8卷 1238-1252页

作者： Ying Tang Yongsheng Li weimin zhao Irina Roslyakova Lijun Zhang School of Materials Science and Engineering.Hebei University of Technology Tianjin 300130PR China ICAMS Ruhr-Universitat BochumUniversitdtsstrasse15044801 BochumGermany State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083PR China

16 Mg-Al-Zn-Bi quaternary alloys were utilized to measure the phase equilibria and transformation temperatures in the Mg-rich Mg-Al-Zn-Bi quaternary system by means of the X-ray diffraction,electron probe micro-analysis and differential scanning calorimetry *** isothermal section at 400℃and three vertical sections along Mg-8 wt%Al-0.75 wt%Zn-vBi,Mg-3.4 wt%Al-0.5 wt%Zn-ABi and Mg-6.9 wt%Al-2.3 wt%Zn-xBi in the Mg-Al-Zn-Bi quaternary system were *** on the literature data,the ternary Mg-Al-Bi and Mg-Bi-Zn systems were re-assessed using the CALculaiton of PHAse Diagram(CALPHAD)*** calculated phase equilibria agree well with the measured *** directly extrapolating the constituent sub-ternary systems,the thermodynamic database for the Mg-Al-Zn-Bi quaternary system was *** remarkable consistency between the predicted phase equilibria and the presently measured data in Mg-Al-Zn-Bi quaternary system further demonstrated the accuracy and reliability of the established thermodynamic *** that,by using the newly developed thermodynamic database,the growth restrict factors and the solidification curves in Bi-containing AZ series magnesium alloys were calculated and *** was confirmed that the grain size of AZ alloys can be refined with the addition of Bi,and the comp on ent Al had larger grain refinement effect than ***,the amount of Bi had also no ticeable effect on the solidification sequence of the AZ alloys.

关键词： Mg-Al-Zn-Bi quaternary system Phase equilibira CALPHAD Thermodynamics Solidification behavior.

A facile synthesis of non-aqueous LiPO_(2)F_(2) solution as the electrolyte additive for high performance lithium ion batteries

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Chinese Chemical Letters 2020年第12期31卷 3209-3212页

作者： weimin zhao Fucheng Ren Qizhang Yan Haodong Liu Yong Yang College of Cheical Engineering and Safety Binzhou UniversityBinzhou 256503China State Key Laboratory for Physical Chemisiry of Solid Surfaces and Department of ChemistryCollege of Cchemistry and Chemical tngineering Ximen UriversityXiammen 36I005China Department of Nanoengineering University of California San DiegoLa Jolla 92093United States

Constructing a reliable and favorable electrode-electrolyte interface is crucial to utilize the exceptional energy storage capability in commercial lithium-ion ***,we report a facile synthesis approach for the lithium difluorophosphate(LiPO_(2)F_(2))solution as an effective film-forming additive via direct adding the Li_(2)CO_(3) into LiPF6 solution at 45℃.Benefiting from the significantly reduced interface resistance(RSEI)and charge transfer impedance(Rct)of both the cathode and anode by adding the prepared LiPO_(2)F_(2)solution into a baseline electrolyte,the cycling performance of the graphite||LiNi_(0.5)Mn_(0.3)Co_(0.2)O_(2) pouch cell is remarkably improved under all-climate condition.

关键词： Lithium difluorophosphate(LiPO_(2)F_(2)) solution Electrolyte additives Electrode-electrolyte interface Synthesis Li-ion batteries

Fabrication of quaternary Mg-Zn-Y-Ce quasi-crystal alloys and their strengthening effects on AZ91 magnesium alloys

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China Foundry 2010年第4期7卷 342-348页

作者： Wang Zhifeng zhao weimin Li Haipeng Liang Chunyong School of Materials Science and Engineering Hebei University of Technology Tianjin 300130 China

Quaternary Mg-Zn-Y-Ce quasi-crystal-containing alloys were fabricated using a metal mold casting route. The microstructures of Mg-Zn-Y-Ce alloys and the distribution of the major elements were analyzed. The differences in morphology and micro-hardness between quaternary Mg-Zn-Y-Ce quasi-crystals and ternary Mg- Zn-Y quasi-crystals were discussed. The result showed that the micro-hardness of Mg-Zn-Y-Ce quasi-crystals reached peak value when the content of Ce was 0.8at.%. Subsequently, various contents of Mg-Zn-Y-0.8Ce alloys were used to strengthen AZ91 magnesium alloys. The microstructural modification and mechanical properties of reinforced AZ91 alloys with and without solution, as well as their aging treatments, were also studied. Further research showed that aging-treated AZ91-10wt.%(Mg-Zn-Y-0.8at.%Ce) alloys exhibited excellent mechanical properties: their Brinell hardness, tensile strength, and elongation were HV91, 252 MPa, and 4.1%, respectively. Through this study, the range of application of AZ91 alloys can further be extended.

关键词： quasi-crystals magnesium alloys AZ91 strengthening effects Mg-Zn-Y-Ce

Fabrication of Mg-Zn-Y-based quasi-crystal by pouring melt into different cooling media

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China Foundry 2012年第3期9卷 207-214页

作者： Wang Zhifeng zhao weimin Qin Chunling Hur Bo-Young School of Materials Science and Engineering Hebei University of TechnologyTianjin 300130China Light Metals Group Korea Institute of Materials ScienceChangwon 642-831Republic of Korea School of Nano and Advanced Materials Engineering Gyeongsang National UniversityJinju 660-701Republic of Korea

Mg-Zn-Y-based quasi-crystal （QC） alloys were fabricated by pouring melts into different cooling media. The effects of different cooling rates on the QC morphology, size, volume fraction and micro-hardness were studied. Multi-component Mg-Zn-Y-based QC alloys were synthesized based on amorphous design principle. QC morphology transformation and its influencing factors were analyzed. Micro/nano spherical quasi-crystals （QCs） were fabricated through a wedge-shaped copper mould and their forming mechanism were discussed by atoms cluster theory, optimum cooling rate theory and the known crucial criteria. The results of research show that with the cooling rate reduced, the solidified morphology of QC phase changes from near-spherical, micro petals （1 to 2 um） to big petals （20 um） and finally grows up to bulk pentagon or hexagon （200 to 400 um）. Multi-component micro-spherical QCs possess higher value of micro-hardness than petal-like QCs with the same components, and also higher than ternary micro-Mg-Zn-Y QCs. The fine master alloys containing micro-QCs （0.4 um） and nano-QCs （about 300 nm and 40 nm） have been fabricated correspondingly on the middle and the tip of wedge-shaped castings. A morphology evolution schematic diagram of Mg-Zn-Y-based QCs is included in this paper.

关键词： quasi-crystals cooling media magnesium alloy Mg-Zn-Y-based alloys

Precipitatation Behavior of FeTiP Phase in High Strength IF Steel

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International Journal of Minerals,Metallurgy and Materials 2000年第3期14卷 197-203页

作者： Zisu zhao, weimin Mao, Yongning Yu (University of Science and Technology Beijing, Beijing 100083, China) University of Science and Technology Beijing Beijing 100083 China

The influence of chemical composition and annealing parameters on the behavior of FeTiP precipitation has been investigated. With increasing Ti content the yield strength and tensile strength were reduced, and the tendency of FeTiP precipitation became more remarkable. No FeTiP precipitate was observed and the best mechanical properties have been obtained in the steel sheet, of which the atom ratio of Ti to N is approximately equal to 1. In the temperature range of 700 to 800℃ the FeTiP precipitation could appear easily. The precipitation process was suppressed when the annealing temperature was below 600℃, and the FeTiP phase was dissolved above 900℃. The FeTiP precipitates would inhibit the migration of grain boundaries during the recrystallization in certain extent, and weaken the density of {111} fiber texture, which resulted in the reduction of r value. The relationship between composition and processing parameters, as well as their influence on the mechanical properties is discussed.

关键词： IF steel FeTiP precipitation

The formation and temperature stability of microemulsion emulsified by polyoxyethylene ether surfactant

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Progress in Natural Science:Materials International 2023年第3期33卷 295-300页

作者： Haixia Zhang Jiahui Xia Chenguang Ding Bin Xu Shoulong Wang Zongxu Wu weimin zhao Department of Chemical Engineering and Safety Binzhou University School of Chemistry and Chemical Engineering Yangzhou University Binzhou Dayou New Energy Development Company Limited

The effect of polyoxyethylene chain length on the formation and temperature stability of W/O microemulsion emulsified by polyoxyethylene ether surfactant is investigated by dissipative particle dynamics simulation(DPD)on the mesoscopic level. The results show that W/O microemulsions can be formed by three polyoxyethylene chain length ether nonionic surfactants with decreasing the water-oil ratio equal to increasing the oil phase content. However, W/O microemulsion is most easily formed by diethylene glycol monododecyl ether(H1T2)with the smallest oxyethylene *** results of temperature stability show that W/O microemulsion emulsified by H1T2 has better stability resistant to high or low temperature. In addition, the interfacial tension of the W/O microemulsion system is the lowest, the end-to-end distance of the surfactant molecule is smallest, and the molecular chain is the most curved at the water-oil interface. The theoretical simulation results can guide the formation of the W/O microemulsion induced by polyoxyethylene ether nonionic surfactant, and provide the guidance for its practical application.

关键词： End-to-end distance DPD W/O microemulsion Mean interfacial tension

Research progress on electrolyte key salts for sodium-ion batteries

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Progress in Natural Science:Materials International 2024年第02期34卷 263-273页

作者： weimin zhao Miao Wang Haichen Lin Kangwoon Kim Rongkai He Shijie Feng Haodong Liu College of Chemical Engineering and Safety Binzhou University Center for Memory and Recording Research Building University of California San Diego STATE GRID Liaocheng Power Supply Company

Sodium-ion batteries(SIBs) are considered potential successors to lithium-ion batteries in the fields of energy storage and low-speed vehicles, thanks to their advantages such as abundant raw material sources, high energy density, and a wide operational temperature range. However, several scientific and engineering challenges still require attention in the development of sodium-ion batteries. Electrolyte salts, as a key component of sodium-ion battery electrolytes, play a critical role in battery performance. This paper provides a brief overview of the research progress on different electrolyte salt systems in sodium-ion batteries. It discusses characteristics such as ionic conductivity, electrochemical windows, electrochemical performance, and thermal safety in various solvent systems. Furthermore, the paper summarizes a series of strategies for controlling electrolyte and electrode interfaces, offering references for addressing the challenges in the mass production and application of sodium-ion batteries.

关键词： Sodium ion batteries Electrolyte Electrolyte salts Electrochemical performance

STUDY OF SEMISUBMERSIBLE ANTI-TYPHOON OFFSHORE PRODUCTION,STORAGE AND MOORING PLATFORM

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China Ocean Engineering 1990年第2期5卷 159-178页

作者： Lian, Gan zhao, weimin Tuo, Tianlu Zeng, Jinzhao Li, Lin Shanghai China

Most reservoirs explorated offshore China are of medium and small size considered as marginal fields. Economic analysis of fields development shows that the conventional floating production system is still too expensive to be taken for the small sized reservoirs. It is necessary to develop a new concept of early production system. SOECO has developed a new production platform which is called formally Semisubmersible Anti-Typhoon Production Storage and Mooring -- SAPSM. Both the theoretic study and model test have proved that the new platform is a suitable early production system for developing oil reserves offshore China and has the ability to survive in typhoon.

关键词： Economics Oil Fields Peoples Republic of China Semisubmersibles

Analysis and Verification of the Conserved MYB Binding Element in the DFR Promoter in Compositae

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Phyton-International Journal of Experimental Botany 2024年第2期93卷 343-353页

作者： Jialei Guo Fengzhen Li Guomin Shi weimin zhao Tao He State Key Laboratory of Plateau Ecology and Agriculture Qinghai UniversityXining810016China School of Ecol-Environmental Engineering Qinghai UniversityXining810016China Key Laboratory of Landscape Plants of Qinghai Province Qinghai UniversityXining810016China

Anthocyanins,ubiquitous in the Compositae family,are regulated by MYB(v-myb avian myeloblastosis viral oncogene homolog),playing an important role in anthocyanin *** this study,we analyzed the regulation pathway in which the MYB protein of subgroup 6 promotes dihydroflavonol reductase(DFR)expression in Compositae,and validated this law in Saussurea medusa through yeast one-hybrid *** results showed that MYB and DFR underwent purification selection,DFR promoter analysis revealed the presence of MYB binding site(GAGTTGAATGG)and bHLH binding site(CANNTG)at the sense strand of 84–116 nucleotide residues from the start *** two motifs were separated by 9–10 nucleotide residues,as existed in the DFR promoters of many Compositae ***,the yeast one-hybrid experiment demonstrated that SmMYB1 can activate the promoter of *** results provide a reference for further functional study of DFR in Compositae.

关键词： Compositae anthocyanin DFR gene MYB gene