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Synchronous improvement of mechanical properties and stress corrosion resistance by stress-aging coupled with natural aging pre-treatment in an Al-Zn-Mg alloy with high recrystallization fraction

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journal of Materials Science & Technology 2022年第26期121卷 40-51页

作者： D.Zhang H.C.jiang Z.j.Cui D.S.Yan Y.Y.song L.j.Rong CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Shandong Key Laboratory of Advanced Aluminum Materials and Technology Binzhou 256606China

Enhancing the strength of Al-Zn-Mg alloys is critical to the weight-lightening of structural components in the application of high-speed trains and aerospace industries,while high stress corrosion cracking(SCC)susceptibility of Al-Zn-Mg alloys(especially the alloy with high recrystallization fraction)with high strength makes it *** this study,the influence of tensile stress-aging coupled with natural aging pre-treatment on the mechanical properties and SCC resistance of Al-Zn-Mg alloy with high recrystallization fraction has been *** results show that tensile stress-aging at 160℃can inhibit the dissolution of clusters/Guinier-Preston(GP)zones formed during long-term natural aging pre-treatment,which increases the number density of matrix precipitates(MPts),narrow the width of precipitate free zone(PFZ),and dramatically improve the mechanical properties of the experimental Al-Zn-Mg ***,the precipitation of the high density of MPts within the matrix will assume a large number of solute atoms during artificial aging,which will reduce the supplement of solute atoms to grain *** a result,the volume of anodic active grain boundary precipitates(GBPs)and the content of free solute atoms at grain boundaries are reduced,which reduces the possibility of initial nucleation and propagation of SCC *** coupled treatment method proposed in this study proves efficient in resolving the contradiction between the strength and SCC resistance in Al-Zn-Mg alloy.

关键词： Al-Zn-Mg alloy Natural aging Stress-aging Precipitates Stress corrosion cracking

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脱落酸代谢及信号转导对胡萝卜CO_(2)加富的响应分析

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核农学报 2025年第2期39卷 275-284,I0008,I0009页

作者：宋红霞高崇真朱伟龙路强宋甜月山西农业大学园艺学院山西太谷030801

胡萝卜作为世界十大蔬菜之一,随着设施农业的发展实现了周年供应。增施CO_(2)可提高胡萝卜产量和类胡萝卜素积累,而脱落酸(ABA)是调控植物生长和响应外界刺激的重要激素。为了探究胡萝卜ABA代谢和信号转导响应CO_(2)加富的分子机制,本... 详细信息

胡萝卜作为世界十大蔬菜之一,随着设施农业的发展实现了周年供应。增施CO_(2)可提高胡萝卜产量和类胡萝卜素积累,而脱落酸(ABA)是调控植物生长和响应外界刺激的重要激素。为了探究胡萝卜ABA代谢和信号转导响应CO_(2)加富的分子机制,本研究分析CO_(2)加富与对照条件下ABA含量和9-顺式环氧类胡萝卜素双加氧酶(NCED)含量的变化;利用RNA-Seq分析CO_(2)加富条件下脱落酸代谢和信号转导过程中参与的关键基因表达情况。结果发现,增施CO_(2)抑制了ABA的合成,降低了酶含量;转录组分析共获得482个差异表达基因(DEGs),其中16个直接响应ABA代谢或与ABA信号转导相关,7个与ABA代谢相关,9个参与ABA信号通路,初步揭示了ABA信号和CO_(2)感知之间的分子关联,ABA不仅高度响应CO_(2)浓度变化,而且参与信号转导过程,调控生长发育。本研究结果为CO_(2)加富条件下ABA积累机制和调控ABA信号转导机制探究提供了参考。

关键词：胡萝卜脱落酸 CO_(2)加富信号转导

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NUMERICAL SIMULATION STUDY ON DEFORMATION UNIFORMITY OF EQUAL CROSS SECTION LATERAL EXTRUSION

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Acta Metallurgica Sinica(English Letters) 2004年第1期17卷 61-63页

作者： Z.L.Chang j.L.song N.H.Hao Department of Materials Engineering Taiyuan Heavy Machinery Institute Taiyuan 030024 ChinaDepartment of Materials Engineering Taiyuan Heavy Machinery Institute Taiyuan 030024 ChinaDepartment of Materials Engineering Taiyuan Heavy Machinery Institute Taiyuan 030024 China

Equal cross section lateral extrusion (ECSLE) is an effective method realizing pure shear deformation. The influence of friction factor on the deformation uniformity of ECSLE was investigated with rigid plastic finite element method. The result shows that the non-uniform deformation in extrusion is caused mainly by the friction between workpiece and die. The higher the friction factor is, the more uneven plastic deformation resulted in extruded workpiece. The relation curve of deformation uniformity vs. friction factor was drawn based on the analysis result. The curve can be used as a basis of ECSLE process design.

关键词： equal cross section lateral extrusion strain finite element method

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Strengthening and deformation mechanism of high-strength CrMnFeCoNi high entropy alloy prepared by powder metallurgy

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journal of Materials Science & Technology 2023年第1期132卷 119-131页

作者： Y.Xing C.j.Li Y.K.Mu Y.D.jia K.K.song j.Tan G.Wang Z.Q.Zhang j.H.Yi j.Eckert Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Laboratory for Microstructures Institute of MaterialsShanghai UniversityShanghai 200444China School of Mechanical Electrical&Information EngineeringShandong UniversityWeihai 264209China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Erich Schmid Institute of Materials Science Austrian Academy of SciencesJahnstraße 12Leoben A-8700Austria Department of Materials Science Chair of Materials PhysicsMontanuniversität LeobenJahnstraße 12Leoben A-8700Austria Adjunct with National University of Science and Technology«MISiS» Leninsky Prosp.4Moscow 119049Russia

Multiphase CrMnFeCoNi high-entropy alloys(HEAs)were prepared by a powder metallurgy process com-bining mechanical alloying(MA)and vacuum hot-pressing sintering(HPS).The single-phase face-centered cubic(FCC)HEA powder prepared by MA was sintered into a bulk HEA specimen containing FCC phase matrix along with precipitated M 23 C 6 phase and nanoscaleσphase *** the sintering temper-ature was 1223 K,the ultimate strength reaches 1300±11.6 MPa,and the elongation exceeds 4%±0.6%.Microstructural characterization reveals that the formation of nanoscale particles and deformation twins play critical roles in improving the strain hardening(SH)*** the MA time promoted the formation of the precipitated phase and enhanced the SH ability by increasing the number of precip-itated *** SH capacity increases significantly with increasing sintering temperature,which is attributed to a significant enhancement in the twinning capacity due to grain growth and the reduced number ofσphase *** systematic studies,the planar glide of dislocations was found to be the main mode of deformation,while deformation twinning appeared as an auxiliary deformation mode when the twinning stress was *** the formation of precipitates leads to grain bound-ary and precipitation strengthening effects,crack initiation is more prominent owing to increased grain boundary brittleness around the precipitated M 23 C 6 *** prominence of crack initiation is a contra-diction that must be reconciled with regard to precipitation *** work serves as a useful reference for the preparation of high-strength HEA parts by powder metallurgy.

关键词： High entropy alloy Powder processing Grain reﬁnement Precipitation strengthening Deformation twinning

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Kinetics and microstructural modeling of isothermal austenite-to-ferrite transformation in Fe-C-Mn-Si steels

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journal of Materials Science & Technology 2019年第8期35卷 1753-1766页

作者： S.j.song W.K.Che j.B.Zhang L.K.Huang S.Y.Duan F.Liu State Key Laboratory of Solidification Processing Northwestern Polytechnical University

During the multi-stage processing of advanced high-strength steels, the austenite-to-ferrite transformation, generally as a precursor of the formation of other non-equilibrium or metastable structures, has a severe effect on the subsequent phase transformations. Herein, a more flexible kinetic and microstructural predictive modeling for the key austenite-to-ferrite transformation of Fe-C-Mn-Si steels was developed,in combination with the classical nucleation theory, the general mixed-mode growth model based on Gibbs energy balance, the microstructural path method and the kinetic framework for grain boundary nucleation. Adopting a bounded, extended matrix space corresponding to a single ferrite grain, both softimpingement and hard-impingement can be naturally included in the current modeling. Accordingly, this model outputs the ferrite volume fraction, the austenite/ferrite interface area per unit volume, and the average grain size of ferrite, which will serve as the input parameters for modeling the subsequent bainite or martensite transformations. Applying the model, this work successfully predicts the experiment measurement of the isothermal austenite-to-ferrite transformation in Fe-0.17 C-0.91 Mn-1.03 Si(wt%) steel at different temperatures and explains why the final-state average grain size of ferrite has a maximum at the moderate annealing temperature. Effectiveness and advantages of the present model are discussed arising from kinetics and thermodynamics accompanied with nucleation, growth and impingement.

关键词： Isothermal austenite-ferrite transformation Kinetics Thermodynamics Microstructural modeling Low-alloy steel

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Plastic Effect on the Sliding Inception Bet ween a Cylinder and a Rigid Flat

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Acta Mechanica Solida Sinica 2019年第1期32卷 1-16页

作者： S.Zhang j.Huan H.song X.Liu Y.G.Wei LNM Institute of MechanicsChinese Academy of SciencesBeijing 100190China Department of Mechanical Engineering Johns Hopkins UniversityBaltimoreMD 21218USA College of Engineering Peking UniversityBeijing 100871China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China

The effec ts of mat erial plasticity and local slip on the sliding inception of asperity are studied in the present ***,a semi-analytical solution is derived under the full-stick condition to analyze the effect of material plasticity on sliding ***,a friction model with contact stiffness criterion is proposed to study the cases from partial-slip condition to full-stick *** element simulations with the provided model are used to present the friction *** friction coefficient of full-s tick interface converges at a st able value,approxima tely *** saturation appears as the normalized contact interference u*is larger than 3.A transition mechanism from slip-dominated to yield-dominated takes place in the sliding *** simulation results are compared with the semi-analytical solution.

关键词： Mat erial yielding Local slip Contact stiffness criterion Finite element simulation

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汉末三国的军师

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南都学坛 2025年第1期45卷 1-12页

作者：宋杰首都师范大学历史学院北京100089

“军师”是为君主将帅谋划作战事务的文职官员,周代尊称为“师”,两汉之际始称“军师”。汉末三国曹操的首位军师是周,后来荀攸作为军师跟随他征伐中原,屡立奇功。曹操被封魏公后,设立有中军师、前军师、左右军师等,文帝以降又在中军和... 详细信息

“军师”是为君主将帅谋划作战事务的文职官员,周代尊称为“师”,两汉之际始称“军师”。汉末三国曹操的首位军师是周,后来荀攸作为军师跟随他征伐中原,屡立奇功。曹操被封魏公后,设立有中军师、前军师、左右军师等,文帝以降又在中军和边防外军都督属下置军师,参赞军务,代表朝廷监督主将。蜀汉刘备先后任命诸葛亮为军师中郎将、军师将军,有带兵的权力。诸葛亮执政后设前军师、中军师等荣誉官衔,到他死后逐渐取消。孙吴长期未设军师,曾经颁授的也只是荣誉性的附加职衔,起不到为君主参议军事的作用。吴、蜀军师的虚设与消亡,与其人才匮乏有密切关系。

关键词：师军师祭酒周荀攸诸葛亮

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Carbon-Nitride-Based Materials for Advanced Lithium-Sulfur Batteries

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Nano-Micro Letters 2022年第12期14卷 579-601页

作者： Wenhao Sun Zihao song Zhenxing Feng Yaqin Huang Zhichuan j.Xu Yi-Chun Lu Qingli Zou State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029People’s Republic of China Electrochemical Energy and Interfaces Laboratory Department of Mechanical and Automation EngineeringThe Chinese University of Hong KongHong Kong Special Administrative Region 999077People’s Republic of China School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Republic of Singapore School of Chemical Biologicaland Environmental EngineeringOregon State UniversityCorvallisOR 97331USA

Lithium-sulfur(Li-S)batteries are promising candidates for next-generation energy storage systems owing to their high energy density and low ***,critical challenges including severe shuttling of lithium polysulfides(LiPSs)and sluggish redox kinetics limit the practical application of Li-S *** nitrides(C_(x)N_(y)),represented by graphitic carbon nitride(g-C_(3)N_(4)),provide new opportunities for overcoming these *** a graphene-like structure and high pyridinic-N content,g-C_(3)N_(4) can effectively immobilize LiPSs and enhance the redox kinetics of S *** addition,its structure and properties including electronic conductivity and catalytic activity can be regulated by simple methods that facilitate its application in Li-S ***,the recent progress of applying C_(x)N_(y)-based materials including the optimized g-C_(3)N_(4),g-C_(3)N_(4)-based composites,and other novel C_(x)N_(y) materials is systematically reviewed in Li-S batteries,with a focus on the structure-activity *** limitations of existing C_(x)N_(y)-based materials are identified,and the perspectives on the rational design of advanced C_(x)N_(y)-based materials are provided for high-performance Li-S batteries.

关键词： Lithium-sulfur batteries Carbon nitride Polysulfide conversion Shuttle effect Anode protection

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Thermodynamic description of the ternary compounds in the Cu-In-Se system

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Rare Metals 2006年第5期25卷 481-487页

作者： SHEN jianyun W.K. Kim SHANG Shunli CHU Maoyou CAO song T.j. Anderson Department of Chemical Engineering University of Florida Gainesville FL 32611 USA General Research Institute for Non-ferrous Metals of Beijing 100088 Beijing China

A set of thermodynamic descriptions of the temary compounds （mainly α-CulnSe2, δ-CulnSe2, Culn3Se5 and CulnsSe8） in the Cu-In-Se system was established by adopting sub-lattice model. The model parameters are carefully evaluated by integrating the experimental data of thermodynamic properties, phase equilibrium and theoretical calculation of formation energies of different point defects. The evaluated Gibbs energies of the compounds reasonably agree with that estimated from EMF experiment and ab initio calculation. The calculated phase relationships in the Cu-In-Se system are in accord with the experimental phase diagrams. The obtained standard enthalpy of formation of CulnSe2 is close to that reported in the literatures.

关键词： Cu-In-Se system thermodynamics Gibbs energy defect compound

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Integrated bioremediation techniques in a shrimp farming environment under controlled conditions

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Acta Oceanologica Sinica 2016年第2期35卷 88-94页

作者： song Xianli YANG Qian REN j.Shengmin SUN Yao WANG Xiulin SUN Fuxin College of Chemistry and Chemical Engineering Ocean University of China Qingdao 266003 China Yellow Sea Fisheries Research Institute Chinese Academy of Fishery Science Qingdao 266071 China Marine Biology Institute of Shandong Province Qingdao 266104 China National Institute of Water and Atmospheric Research Christchurch 8440 New Zealand

This study investigated the integrated bioremediation techniques for a shrimp culture system to reduce unconsumed feed and the contents of suspended solids（SS）, nutrients and organic pollutants using barracuda,clamworm, scallop, large algae and a biofilter. A multi-pool internal circulation system was designed to test the effectiveness of the techniques in the laboratory. The experimental result has shown that Argopecten irradians,Gracilaria lemaneiformis and the biofilter efficiently reduced the contents of SS, dissolved inorganic carbon（DIC）and dissolved organic carbon（DOC） in the breeding wastewater. The amount of unconsumed feed was significantly reduced by barracuda and clamworm, but there was an increase in the contents of SS, DIC and DOC in the water due to disturbance by the barracuda and clamworm. The capacity of macroalgae to extract inorganic nitrogen was insufficient. However, the balance of the nitrogen fixation rate of macroalgae and the biological exhaust nitrogen rate within the system should be fully considered. The use of the biofilter alone was not optimal for the remediation of organic matter in shrimp effluent so that auxiliary foam separation technology is needed to improve the ability of the system to remove macromolecules. This study provides a basis for the further development of remediation techniques to reduce the environmental impact of shrimp aquaculture.

关键词： shrimp aquaculture environment bioremediators integrated remediation technique

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