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Enhanced strength-ductility synergy of magnesium alloy fabricated by ultrasound assisted directed energy deposition

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Journal of Materials Science & Technology 2024年第11期178卷 247-261页

作者： Xinzhi li xuewei Fang Mugong Zhang Binglin Wang Ke Huang State Key laboratory for Manufacturing Systems Engineering School of Mechanical EngineeringXi'an Jiaotong UniversityXi'an 710049China

Investigations on the fabrication of large-size lightweight Mg alloy components by wire-arc directed en-ergy deposition(DED)are steadily ***,most of these components still suffer from inferior performance due to internal defects and inherent columnar ***,external ultrasound fields with different powers were successfully introduced into the wire-arc DED of AZ31 Mg *** microstructure,defects,and mechanical properties of the fabricated components were carefully charac-terized and *** results show that the external ultrasound fields lead to decreased porosity,complete columnar to equiaxed transition(CET),and enhanced ***,the UA90 samples exhibited a remarkable increase of~30%,~45%,and~189%in yield strength,ultimate tensile strength,and elongation,*** dominant mechanisms of enhanced strength-ductility synergy were analyzed in *** study thus sheds new light on wire-arc DED of Mg alloy components with excellent performance via external ultrasound fields.

关键词： Wire-arc directed energy deposition External ultrasound field Defects Microstructure evolution Strength-ductility synergy

Wire and arc additive manufacturing of dissimilar 2319 and 5B06 aluminum alloys

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Journal of Materials Science & Technology 2022年第29期124卷 65-75页

作者： Tianxing Chang xuewei Fang Gang liu Hongkai Zhang Ke Huang State Key laboratory for Manufacturing Systems Engineering School of Mechanical EngineeringXi’an Jiaotong UniversityXi’an 710049China State Key laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China

Aluminum alloy is the most widely used light alloy at *** combining different types of aluminum alloys,their functional properties can be *** the present research,two components composed of 2319(Al-6.5Cu)and 5B06(Al-6.4Mg)dissimilar alloys were fabricated by wire and arc additive manufacturing(WAAM).The deposited component with the bottom half of 2319 and the top half of 5B06 exhibits better mechanical properties than its counterpart deposited vice *** ultimate tensile strength,yield strength,and elongation are 258.5 MPa,139.3 MPa,and 5.6%,respectively,which are only slightly inferior to the mechanical properties of 2319 base *** results show that for both components,fracture occurred at a layer thickness above the interface layer during the tensile test,regardless of the deposition *** appears that the thermal stress due to the long dwell time and the remelting of the S-AlCu Mg phase are the main factors promoting crack *** on the deposition order,cracks propagate either along the aggregated pores or stripθ-AlCu phase distributed along the grain *** analyzing the heat input and selecting the appropriate depositing order,the strength of WAAM dissimilar aluminum alloys can be effectively improved through the proper control of microstructure and internal defects.

关键词： Wire and arc additive manufacturing Dissimilar materials Defects Microstructure Mechanical Properties Aluminum alloy

基于FACTSage的钒钛磁铁矿配碳还原计算

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中国科技论文在线 2010年第11期5卷 885-889页

作者：刘许旸白晨光吕学伟李东海尹嘉清伍永刚重庆大学材料科学与工程学院重庆400044

为了探索碳热还原钒钛磁铁矿的机理,运用FACTSage软件对钒钛磁铁矿碳热还原过程进行了理论计算。结果表明,金属Fe和Ti的起始还原温度分别为700℃和1300℃左右,随着温度的升高,液相中金属的生成量逐渐增加。配碳量对金属液相的产生影响较... 详细信息

为了探索碳热还原钒钛磁铁矿的机理,运用FACTSage软件对钒钛磁铁矿碳热还原过程进行了理论计算。结果表明,金属Fe和Ti的起始还原温度分别为700℃和1300℃左右,随着温度的升高,液相中金属的生成量逐渐增加。配碳量对金属液相的产生影响较大,配碳为16%时,出现金属液相的温度为1550℃;配碳量大于18%时,金属液相产生的温度降低到1180℃。碱度对Fe回收率影响不大;而当碱度为0.4时,Ti的回收率最高。当配碳量为20%、碱度为0.4时,Fe、Ti的还原效果最好。

关键词：钒钛磁铁矿金属回收率碳热还原

Corrosion form transition of mooring chain in simulated deep-sea environments:Remarkable roles of dissolved oxygen and hydrostatic pressure

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Journal of Materials Science & Technology 2023年第31期162卷 118-130页

作者： xuewei Zhang Weijie Wu Yuan li Jinxu li lijie Qiao Corrosion and Protection Center Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China

The corrosion form and mechanical properties deterioration of mooring chain steel in simulated deep-sea environments were *** the increase of ocean depth,not only the pressure increases,but also the dissolved oxygen content *** two factors affect corrosion evolution of mooring chain steel in simulated deep-sea environments,which was studied for the first *** with uniform corrosion of mooring chain steel in shallow sea with sufficient oxygen,low dissolved oxygen leads to the corrosion dominated by pitting with pit ***,hydrostatic pressure distinctly accelerates pitting initiation and *** higher the hydrostatic pressure is,the more serious the pitting *** failure mechanism of unstressed mooring chain steel serving in simulated deep-sea environments,both absorbed hydrogen and corrosion morphology can degrade the ductility of mooring chain steel,in which the leading factor depends on the service *** severe pitting is the main factor and causes remarkable ductility loss of the steel after long-term *** hydrogen plays an important role on elongation loss in early stage.

关键词： High-strength low-alloy steel Dissolved oxygen Hydrostatic pressure Pitting corrosion Failure mechanism

Boronic acid-containing carbon dots array for sensitive identification of glycoproteins and cancer cells

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Chinese Chemical letters 2021年第10期32卷 3043-3047页

作者： Shuai Chen xuewei Zhang Yongliang Yu Jianhua Wang College of life and Health Sciences Northeastern UniversityShenyang 110169China Research Center for Analytical Sciences Department of ChemistryCollege of SciencesNortheastern UniversityShenyang 110819China

Discrimination of glycoproteins and cell types is a significant but difficult ***,we presented a novel fluorescence sensor array for the detection and identification of glycoproteins and cancer cells based on the specific affinity between boronic acid-containing carbon dots(BA-CDs)and cis-diol residues of *** differential binding affinity of three BA-CDs to various glycoproteins resulted in a different fluorescence turn-on signal pattern caused by aggregation-enhanced emission(AEE),along with negligible response from other ***,BA-CDs encompassing sensing elements and signal indicator into one can enable a fast and accurate discrimination of glycoproteins with simple and easy *** glycoproteins could be well discriminated at a very low concentration of 10 nmol/*** discriminating capability of glycoproteins is not sacrificed in both human urine and ***,different glycoprotein compositions of cancer cells provide more recognizable features for identification of cancer cells,comparing to the total *** cell types could be identified in 15 min at a low concentration of 1000 cells/*** method is fast,accurate,and easy operation,and has a potential application in cancer diagnosis.

关键词： Sensor array Boronic acid Carbon dots Glycoproteins and cells Aggregation-enhanced emission

From plant immunity to crop disease resistance

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Journal of Genetics and Genomics 2022年第8期49卷 693-703页

作者： Yan Zhao Xiaobo Zhu xuewei Chen Jian-Min Zhou State Key laboratory of Plant Genomics Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China State Key laboratory of Crop Gene Exploration and Utilization in Southwest China Sichuan Agricultural University at WenjiangChengduSichuan 611130China CAS Center for Excellence in Biotic Interactions University of Chinese Academy of SciencesBeijing 100049China Hainan Yazhou Bay Seed laboratory SanyaHainan 572025China

Plant diseases caused by diverse pathogens lead to a serious reduction in crop yield and threaten food security *** improvement of plant immunity is considered as the most effective and sustainable approach to control crop *** the last decade,our understanding of plant immunity at both molecular and genomic levels has improved *** with advances in biotechnologies,particularly clustered regularly interspaced short palindromic repeat(CRISPR)/Cas9-based genome editing,we can now rapidly identify new resistance genes and engineer disease-resistance crop plants like never *** this review,we summarize the current knowledge of plant immunity and outline existing and new strategies for disease resistance improvement in crop *** also discuss existing challenges in this field and suggest directions for future studies.

关键词： Plant immunity Disease resistance Resistance genes Molecular breeding Genetic engineering Crops

Approximate Forward Attractors of Non-Autonomous Dynamical Systems

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Chinese Annals of Mathematics,Series B 2019年第4期40卷 541-554页

作者： xuewei JU Desheng lI Chunqiu lI Ailing QI Department of Mathematics Civil Aviation University of ChinaTianjin 300300China Department of Mathematics Tianjin UniversityTianjin 300072China Department of Mathematics Civil Aviation University of ChinaTianjin 300300China

In this paper the forward asymptotical behavior of non-autonomous dynamical systems and their attractors are investigated. Under general conditions, the authors show that every neighborhood of pullback attractor has f... 详细信息

关键词： Non-autonomous dynamical systems Pullback attractors Forward attractors Uniform attractors Approximate forward attractors

A protein-enabled protective film with functions of self-adapting and anion-anchoring for stabilizing lithium-metal batteries

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Journal of Energy Chemistry 2022年第1期31卷 485-495,I0013页

作者： Chenxu Wang xuewei Fu Shengnan lin Jin liu Wei-Hong Zhong School of Mechanical and Materials Engineering Washington State UniversityPullmanWA 99164USA

Practical implementations of rechargeable lithium(li)metal batteries have long been plagued by multiple problems of li anode,such as li dendrite growth,large volume change,low Coulombic ***,we report a protein-enabled film that can provide effective protection for li *** protective film with an integrated design of high flexibility,strong adhesion and high li-ion transference number(0.80)is fabricated by incorporating denatured zein(corn protein)with polyethylene oxide(PEO)acting as an age nt for sustaining the denatured protein chains against refolding via the intermolecular interactions between ***,a conformable zein-enabled protective film(zein@PEO)with simultaneous en hancement in flexibility,modulus and adhesion strength is gen erated to offer both functi ons of self-adapting and anion-anchoring *** results show that the zein@PEO film is able to accommodate the volume change,reduce the side reactions,and homogenize the ion *** from these significant properties/fu nctions,the li/Cu cell with the zein@PEO film delivers prolonged cycle life for over 500 hours with stable *** with liMn_(2)O_(4) cathode,the capacity,cycle stability and rate performance of the cell are remarkably improved as well,demonstrati ng the effectiveness in stabilizing li metal batteries.

关键词： Zein Self-adapting Flexibility lithium metal lithium dendrite

Crystal structure,phase transitions,and thermodynamic properties of magnesium metavanadate(MgV_(2)O_(6))

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Journal of Magnesium and Alloys 2024年第4期12卷 1449-1460页

作者： Guishang Pei Cheng Pan Dapeng Zhong Junyi Xiang xuewei lv College of Materials Science and Engineering Chongqing UniversityChongqing 400044China Chongqing Key laboratory of Vanadium-Titanium Metallurgy and Advanced Materials Chongqing UniversityChongqing 400044China Pangang Group Research Institute Co. Ltd.Panzhihua 617000China

As a promising anode material for magnesium ion rechargeable batteries,magnesium metavanadate(MgV_(2)O_(6))has attracted considerable research interest in recent years.A MgV_(2)O_(6)sample was synthesized via a facile solid-state reaction by multistep-firing stoichiometric mixtures of MgO and V2O5 powder under an air *** solid-state phase transition fromα-MgV_(2)O_(6)toβ-MgV_(2)O_(6)occurred at 841 K and the enthalpy change was 4.37±0.04 kJ/*** endothermic effect at 1014 K and the enthalpy change was 26.54±0.26 kJ/mol,which is related to the incongruent melting ofβ-MgV_(2)O_(6).In situ XRD was performed to investigate phase transition of the as-prepared MgV_(2)O_(6)at high *** cell parameters obtained by Rietveld refinement indicated that it crystallizes in a monoclinic system with the C2/m space group,and the lattice parameters of a=9.280 A°,b=3.501 A°,c=6.731 A°,β=111.76°.The solid-state phase transition fromα-MgV_(2)O_(6)toβ-MgV_(2)O_(6)was further studied by thermal kinetics,indicating that this process is controlled first by a fibril-like mechanism and then by a spherulitic-type mechanism with an increasing heating ***,the enthalpy change of MgV_(2)O_(6)at high temperatures was measured utilizing the drop calorimetry,heat capacity was calculated and given as:Cp=208.3+0.03583T-4809000T^(−2)(298-923 K)(J mol^(−1)K^(−1)),the high-temperature heat capacity can be used to calculate Gibbs free energy of MgV_(2)O_(6)at high temperatures.

关键词： MgV_(2)O_(6) Crystal structure Phase transitions Thermodynamic functions