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Journal of Magnesium and Alloys 2022年第11期10卷 3205-3216页

作者： Pengcheng Guo Xiao liu Biwu Zhu Wenhui Liu Liqiang Zhang School of Mechanical and Electrical Engineering Central South University of Forestry and TechnologyChangsha 410004China School of Material Science and Engineering Hunan University of Science and TechnologyXiangtanHunan 411201China

Ultra-high strain rate impact tests were conducted by Split-Hopkinson pressure bar to investigate the microstructure evolution and impact deformation mechanism of a solution treated casting AM80 Mg alloy at 25, 150 and 250 ℃ with a strain rate of 5000 s^(-1). The microcrack and dynamic recrystallization(DRX) preferentially nucleate at grain boundary(GB) and twin boundary(TB), especially at the intersections between GBs and TBs, and then propagate along twin direction. In contrast, the adiabatic shear bands preferentially occur at high-density twined regions. At 25 ℃, the dominated deformation mechanisms are basal slip and twinning. As deformation temperature increases to 150and 250℃, the deformation gradually shifts to be dominated by a coordinated mechanism among non-basal slip, twinning and DRX. The flow stress behavior and deformation mechanism indicate that the degree of decrease in flow stress with temperature is associated with the change of deformation mode.

关键词： AM80 mg alloy Deformation mechanism Ultra-high strain rate Twinning Dynamic recrystallization

Accumulation mechanism of mantle-derived helium resources in petroliferous basins, eastern China

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Science China Earth Sciences 2022年第12期65卷 2322-2334页

作者： Xiaofeng WANG Quanyou liu Wenhui Liu Dongdong ZHANG Xiaofu LI Dong ZHAO State Key Laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi’an 710069China State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development Beijing 100083China Institute of Energy Peking UniversityBeijing 100871China Petroleum Exploration and Production Research Institute SINOPECBeijing 100083China

A series of marginal-sea basins and fault-depression basins were formed in eastern China under the background of subduction of the West Pacific plate.Different types of helium-rich natural gas reservoirs(He>1000 ppm,1 ppm=1μmol mol^(-1))have been found in these basins:helium-rich CO_(2)gas reservoirs,helium-rich N_(2)gas reservoirs,and helium-rich hydrocarbon gas reservoirs.Based on the analysis of gas geochemical data,the source and accumulation mechanism of helium in these heliumrich natural gas reservoirs were discussed.Helium-rich natural gas has relatively high 3He/4He ratios(0.88-4.91 Ra,average 2.82 Ra).The ^(3)He/^(4)He ratio characteristics of mantle xenoliths and mantle-derived CO_(2)gas reservoirs indicate that the helium in these helium-rich natural gas reservoirs is mainly mantle-derived(>70%).The original mantle volatile is mainly CO_(2)with a low helium concentration(Helium in the gas reservoir is mainly related to the dissolution and mineralization of CO_(2).During this process,the CO_(2)/3He ratio decreases from 2×10^(9)to approximately 2×10^(6).As CO_(2)dissolves and mineralizes,the concentration of conservative gases(He and N_(2))increases in the remaining CO_(2)gas proportionally to the loss of CO_(2).Large amounts of carbonate minerals,such as dawsonite,which are relatively enriched in 13C,are found in CO_(2)reservoirs in eastern China.The relative enrichment of^(12)C in residual CO_(2)gas is important evidence of the dissolution and mineralization of CO_(2).The relative abundance of mantle-derived helium and N_(2)gas increases thousands of times during the dissolution and mineralization of CO_(2),which is the main accumulation mechanism of mantle-derived helium-rich CO_(2)gas reservoirs and helium-rich N_(2)gas reservoirs.Helium-rich gas from the mantle is mixed with alkane gas generated by organic matter in the sedimentary basin to form helium-rich hydrocarbon gas reservoirs.

关键词： Mantle-derived helium ^(3)He/4He ratio,Helium resources,Helium-rich natural gas,Accumulation mechanism

Inhibitory Effect of Vibrio neocaledinocus sp. and Pseudoalteromonas piscicida Dual-Species Biofilms on the Corrosion of Carbon Steel

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Acta Metallurgica Sinica(English Letters) 2022年第4期35卷 551-562页

作者： Masoumeh Moradi Jianlin Li Wenhui Liu Dake Xu Fuhui Wang Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang 110819China Key Laboratory for Anisotrotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China

Multi-species biofilms are found in various bacterial habitats and have industrial relevance. These complex bacterial communities have synergetic effects, unlike a single species. Therefore, it is critical to evaluate these complex communities as a whole. Here, the inhibitory eff ect of single-and dual-species biofilms of Vibrio neocaledinocus sp. and Pseudoalteromonas piscicida for A36 carbon steel corrosion was investigated. The results demonstrated that the synergistic interactions of the monoculture increased the overall biomass production of the dual-species biofilm, but the growth rate was reduced in the presence of the dual-species culture due to a lack of nutrients. Field emission scanning electron microscopy images also confirmed the development of biofilms—they became more homogenized via exposure time in both the mono-and dual-species cultures. The corrosion resistance of A36 carbon steel positively increased because of the dual-species interactions. This reached the highest value after four weeks of exposure. The highest corrosion inhibition e fficiency of 99.8% was achieved in the dual-species cultures. Microbial community analysis revealed the high relative abundance of Pseudoalteromonas piscicida during the initial days of exposure, demonstrating the dominant role of this bacterium in the biofilm structure.

关键词： Dual-species biofilm Steel alloys Corrosion inhibitory Electrochemical analysis Cooperative interaction

Unveiling the mechanical response and accommodation mechanism of pre-rolled AZ31 magnesium alloy under high-speed impact loading

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Journal of Magnesium and Alloys 2022年第4期10卷 1096-1108页

作者： Xiao liu Hui Yang Biwu Zhu Yuanzhi Wu Wenhui Liu Changping Tang Key Laboratory of High Temperature Wear Resistant Materials Preparation Technology of Hunan Province Hunan University of Science and TechnologyXiangtanHunan 411201China Research Institute of Automobile Parts Technology Hunan Institute of TechnologyHengyangHunan 421002China

Split Hopkinson pressure bar(SHPB)tests were conducted on pre-rolled AZ31 magnesium alloy at 150–350℃ with strain rates of 2150s-1,3430s^(-1) and 4160s-1.The mechanical response,microstructural evolution and accommodation mechanism of the pre-rolled AZ31 magnesium alloy under high-speed impact loading were investigated.The twin and shear band are prevailing at low temperature,and the coexistence of twins and recrystallized grains is the dominant microstructure at medium temperature,while at high temperature,dynamic recrystallization(DRX)is almost complete.The increment of temperature reduces the critical condition difference between twinning and DRX,and the recrystallized temperature decreases with increasing strain rate.The mechanical response is related to the competition among the shear band strengthen,the twin strengthen and the fine grain strengthen and determined by the prevailing grain structure.The fine grain strengthen could compensate soften caused by the temperature increase and the reduction of twin and shear band.During high-speed deformation,different twin variants,introduced by pre-rolling,induce different deformation mechanism to accommodate plastic deformation and are in favor for non-basal slip.At low temperature,the high-speed deformation is achieved by twinning,dislocation slip and the following deformation shear band at different deformation stages.At high temperature,the high-speed deformation is realized by twinning and dislocation slip of early deformation stage,transition shear band of medium deformation stage and DRX of final deformation stage.

关键词： Mechanical response Pre-twinning Accommodation mechanism Pre-rolled AZ31 magnesium alloy High-speed impact loading

Progress on High Voltage PEO-based Polymer Solid Electrolytes in Lithium Batteries

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Chemical Research in Chinese Universities 2022年第3期38卷 735-743页

作者： HOU wenhui OU Yu liu Kai Department of Chemical Engineering Tsinghua UniversityBeijing100084P.R.China

Polymer electrolytes have attracted great interest for next-generation lithium-based batteries on account of safety and high energy density.In this review,we assess recent progress on the design of poly(ethylene oxide)(PEO)-based solid polymer electrolytes in high voltage lithium batteries and identify possible side reactions between PEO-based electrolytes and existing cathodes.We provide an overview of the ways to enhance high voltage resistance of PEO-based electrolytes.Those include components blend,molecular design and interface modification.With these efforts,we want to present new insights into rational design of PEO-based electrolytes to develop solid-state lithium batteries for advanced performance.

关键词： Poly(ethylene oxide) Lithium battery High voltage Molecular design Interface modification

Unraveling the interfacial effect of PdBi bimetallic catalysts on promoting CO_(2)electroreduction to formate

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Nano Research 2023年第8期16卷 10822-10831页

作者： Wenhui Liu Lingtong Ding Minmin liu Xiao Wang Zhengrong Zhang Tian-Wen Jiang Shengjuan Huo Wen-Bin Cai International Joint Laboratory of Catalytic Chemistry Department of ChemistryInstitute for Sustainable EnergyCollege of SciencesShanghai UniversityShanghai 200444China Shenzhen Key Laboratory of Nanobiomechanics Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Paul C.Lauterbur Research Center for Biomedical Imaging Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Collaborative Innovation Center of Chemistry for Energy MaterialsDepartment of ChemistryFudan UniversityShanghai 200438China

Through interface engineering and content control strategy,a PdBi bimetallic interface structure was constructed for the first time to selectively convert CO_(2)to formate with a remarkably high Faraday efficiency(FEformate)of 94%and a partial current density(jformate)of 34 mA·cm^(−2)at−0.8 V vs.reversible hydrogen electrode(RHE)in an H-cell.Moreover,the PdBi interface electrocatalyst even exhibited a high current density of 180 mA·cm^(−2)with formate selectivity up to 92%in a flow cell and could steadily operate for at least 20 h.Electrochemical in-situ attenuated total reflection surface enhanced infrared absorption spectroscopy(ATR-SEIRAS)confirmed that the PdBi interface could greatly weaken the adsorption of*CO intermediates due to electronic and geometric effects.Density functional theory(DFT)calculations also established that the PdBi interface regulated the CO_(2)-to-formate pathway by reducing the energy barrier toward HCOOH and largely weakening the adsorption of*CO intermediates on the catalyst surface.This study reveals that the unique PdBi bimetallic interface can provide a novel platform to study the reaction mechanism through combining in-situ ATR-SEIRAS and DFT calculations.

关键词： carbon dioxide reduction reaction bimetallic PdBi interface engineering formate in-situ attenuated total reflection surface enhanced infrared absorption spectroscopy(ATR-SEIRAS)

Tuning electronic configuration of WP_(2) nanosheet arrays via nickel doping for high-efficiency hydrogen evolution reaction

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Journal of Energy Chemistry 2021年第4期30卷 17-24页

作者： Wei liu Peng Geng Shiqing Li Wenhui Liu Dayong Fan Huidan Lu Zhenhuan Lu Yongping liu Guangxi Key Laboratory of Electrochemical and Magneto-chemical Functional Materials College of Chemistry and BioengineeringGuilin University of TechnologyGuilin 541004GuangxiChina

Modulate the electronic structure and surface energy by nanostructure and heteroatom doping is an efficient strategy to improve electrocatalytic activity of hydrogen evolution reaction(HER).Herein,nickel incorporated WP_(2) self-supporting nanosheet arrays cathode was synthesized on carbon cloth(Ni-WP_(2) NS/CC)by in-situ phosphating reduction of the Ni-doped WO3.It shows that heteroatom doping and the three-dimensional(3D)nanosheet arrays morphology both facilitate to reduce the interfacial transfer resistance and increase electrochemical-active surface areas,which effectively improve electrocatalytic hydrogen evolution reaction(HER)activity.The optimized catalyst,1%Ni-WP_(2) NS/CC,exhibits an outstanding electrocatalytic performance with an overpotential of 110 m V at 10 m A cm^(-2) and a Tafel slope of 65 m V dec^(-1) in the acid solution.DFT calculations further demonstrate the nickel doping can adjust the intrinsic structure of electronics,lower the Gibbs free energy of adsorption of hydrogen(DGH*),and effectively improve the HER performance.

关键词： Heteroatom doping Tungsten phosphide Nanosheet arrays Electrocatalyst Hydrogen evolution reaction

Towards intelligent design optimization: Progress and challenge of design optimization theories and technologies for plastic forming

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Chinese Journal of Aeronautics 2021年第2期34卷 104-123页

作者： Heng LI Jingchao YANG Guangyao CHEN Xin liu Zhao ZHANG Guangjun LI Wenhui Liu State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Poly technical UniversityXi'an 710072China Chengdu Aircraft Industry(Group)Corporation Ltd. Chengdu 610092China High Temperature Wear Resistant Materials and Preparation Technology of Hunan Province National Defence Science and Technology Laboratory Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and ConversionSchool of Materials Science and EngineeringHunan University of Science and TechnologyXiangtan 411201China

Plastic forming is one of enabling and fundamental technologies in advanced manufacturing chains. Design optimization is a critical way to improve the performance of the forming system, exploit the advantages of high productivity, high product quality, low production cost and short time to market and develop precise, accurate, green, and intelligent(smart) plastic forming technology. However, plastic forming is quite complicated, relating to multi-physics field coupling,multi-factor influence, multi-defect constraint, and triple nonlinear, etc., and the design optimization for plastic forming involves multi-objective, multi-parameter, multi-constraint, nonlinear,high-dimensionality, non-continuity, time-varying, and uncertainty, etc. Therefore, how to achieve accurate and efficient design optimization of products, equipment, tools/dies, and processing as well as materials characterization has always been the research frontier and focus in the field of engineering and manufacturing. In recent years, with the rapid development of computing science, data science and internet of things(Io T), the theories and technologies of design optimization have attracted more and more attention, and developed rapidly in forming process. Accordingly, this paper first introduced the framework of design optimization for plastic forming. Then, focusing on the key problems of design optimization, such as numerical model and optimization algorithm,this paper summarized the research progress on the development and application of the theories and technologies about design optimization in forming process, including deterministic and uncertain optimization. Moreover, the applicability of various modeling methods and optimization algorithms was elaborated in solving the design optimization problems of plastic forming. Finally, considering the development trends of forming technology, this paper discusses some challenges of design optimization that may need to be solved and faced in forming process.

关键词： Advanced manufacturing Design optimization Deterministic optimization(DOP) Intelligent design optimization(IDO) Plastic forming Uncertain optimization(UOP)

Roles of gypsum/salt-bearing sequence in hydrocarbon accumulation and storage

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能源地球科学(英文)

能源地球科学(英文) 2023年第1期4卷 93-102页

作者： Wenhui Liu Yining Li Quanyou liu Xiaofeng Wang Qingqiang Meng Dianwei Zhang Longfei Lu Houyong Luo Department of Geology State Key Laboratory of Continental DynamicsNorthwest UniversityXi'anShaanxi710069China Petroleum Exploration&Production Research Institute SINOPECBeijing100083China Sinopec Key Laboratory of Petroleum Accumulation Mechanisms WuxiJiangsu214151China

Gypsum/salt beds are widely developed in petroliferous basins across the world.Most basins with gypsum/salt beds have been proven to host abundant hydrocarbon resources.Previous studies on the effects of gypsum/salt beds on hydrocarbon reservoirs primarily focused on their excellent sealing property as cap rocks.However,an increasing number of exploration discoveries have shown that gypsum/salt beds have the potential to promote the formation of high-quality source rocks and hydrocarbon reservoirs.Gypsum/salt beds influence the generation,preservation and accumulation of hydrocarbons.Based on the systematic analysis of the generation of hydrocarbons in global gypsum/saltbearing sequences,the study discussed the control of gypsum/salt beds on play elements,and explore the relationship between the development of gypsum/salt beds and global large-and medium-scale hydrocarbon reservoirs.Furthermore,we analyzed the correlation between typical gypsum/saltbearing sequences and their hydrocarbon generation potentials in China.In-depth analysis shows three patterns in terms of the spatial superimposition of gypsum/salt beds and source rocks,that is,postsalt pattern,inter-salt pattern and pre-salt pattern.Among others,the source rocks of the inter-salt pattern are widely developed in salt basins and of great potential for hydrocarbon exploration.

关键词： Gypsum/salt bed Hydrocarbon reservoir Source rock Play element

Random packing of tetrahedral particles using the polyhedral discrete element method

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Particuology 2015年第6期13卷 109-117页

作者： Shiwei Zhao Xiaowen Zhou Wenhui Liu Chengguang Lai School of Civil Engineering and Transportation South China University of Technology Guangzhou 510640 China State Key Laboratory of Subtropical Building Science Guangzhou 510640 China Key Laboratory of Water Cycle and Water Security in Southern China of Guangdong Higher Education Institutes Cuangzhou 510275 China

The random packing of tetrahedral particles is studied by applying the discrete element method （DEM）, which simulates the effects of friction, height ratio, and eccentricity. The model predictions are ana- lyzed in terms of packing density and coordination number （CN）. It is demonstrated that friction has the maximal effect on packing density and mean CN among the three parameters. The packing den- sity of the regular tetrahedron is 0.71 when extrapolated to a zero friction effect. The shape effects of height ratio and eccentricity show that the regular tetrahedron has the highest packing density in the family of tetrahedra, which is consistent with what has been reported in the literature. Compared with geometry-based packing algorithms, the DEM packing density is much lower. This demonstrates that the inter-particle mechanical forces have a considerable effect on packing. The DEM results agree with the published experimental results, indicating that the polyhedral DEM model is suitable for simulating the random packing of tetrahedral particles.

关键词： Discrete element method Random packing Tetrahedral particle Coordination number Packing density