检索结果-南通市图书馆

Compressive property and energy absorption characteristic of interconnected porous Mg-Zn-y alloys with adjusting y addition

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2024年第1期12卷 171-185页

作者： J.A.Liu s.J.Liu B.wang W.B.sun X.J.Liu Z.W.Han College of Materials science and Engineering Key Laboratory of Automobile Materials(Ministry of Education)Jilin UniversityChangchun 130022PR China Key Laboratory of Bionic Engineering(Ministry of Education) College of Biological and Agricultural EngineeringJilin UniversityChangchun130022PR China Weihai Institute for Bionics-Jilin University Weihai 264205PR China

In this study,interconnected porous Mg-2Zn-xy alloys with different phase compositions were prepared by various y additions(x=0.4,3,and 6 wt.%)to adjust the compressive properties and energy absorption *** characterization methods were then applied to identify the microstructure of the porous Mg-Zn-y and describe the details of the second *** tests were performed at room temperature(RT),200℃,and 300℃to study the impact of the y addition and testing temperature on the compressive properties of the porous *** experimental results showed that a high y content promotes a microstructure refinement and increases the volume fraction of the second *** the y content increases,different Mg-Zn-y ternary phases appear:I-phase(Mg_(3)Zn_(6)y),W-phase(Mg_(3)Zn_(3)y_(2)),and LPsO phase(Mg_(12)Zny).When the y content ranges between 0.4%and 6%,the compressive strength increases from 6.30MPa to 9.23 MPa,and the energy absorption capacity increases from 7.33 MJ/m^(3)to 10.97 MJ/m^(3)at RT,which is mainly attributed to the phase composition and volume fraction of the second ***,the average energy absorption efficiency is independent of the y *** addition,the compressive deformation behaviors of the porous Mg-Zn-y are altered by the testing *** compressive strength and energy absorption capacity of the porous Mg-Zn-y decrease due to the softening effect of the high temperature on the *** deformation behaviors at different temperatures are finally observed to reflect the failure mechanisms of the struts.

关键词： Porous magnesium Rare earth elements Microstructure Compressive behavior Energy absorption characteristic

Cr^(3+) activated Na_(3)REsi_(3)O_(9)(RE=y,Lu,sc) silicate broadband near-infrared phosphors for luminescence towards NIR-Ⅱ region via a multi-site occupancy strategy

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第8期42卷 1447-1457,I0002页

作者： Jiantong wang Changshuai Gong sihan yang Qi Zhu Xuejiao wang Ji-Guang Li College of Chemistry and Materials Engineering Bohai UniversityJinzhou121007China Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang110819China Research Center for Electronic and Optical Materials National Institute for Materials ScienceTsukubaIbaraki 305-0044Japan

Phosphor-converted near-infrared light-emitting diodes(NIR pc-LEDs) are finding applications in various fields including food quality analysis,biomedical imaging,night vision,and *** crucial factor in the development of NIR pc-LEDs devices lies in the advancement of high-performance broadband NIR phosphors,In this work,novel Cr^(3+)-activated silicate phosphors NaREsi_(3)O_(9)(RE=y,Lu,sc) are *** silicate has a special 3D network structure in which RE has four different sites,forming four octahedrons and providing suitable occupation sites for Cr^(3+).The phosphors demonstrate a wide emission spectrum ranging from 750 to 1450 nm when excited by light at 468 *** full width at half maximum(FWHM),which benefits from the presence of Cr^(3+)ions occupying multiple sites,is measured to be 203 ***,the strongest emission peak is observed at a longer wavelength of 984 nm compared to most other systems activated by Cr^(3+).The Na_(3)scsi_(3)O_(9) lattice provides a weak crystal field(Dq/B=1.97) and weak phonon-photon coupling for Cr^(3+),and the integrated emission intensity of Na_(3)scsi_(3)O_(9):0,03Cr^(3+)is 4.66 times stronger than that of Na_(3)ysi_(3)O_(9):0.03Cr^(3+).

关键词： Rare earths Broadband near-infrared silicate Photoluminescence Cr^(3+)

A new insight into LPsO phase transformation and mechanical properties uniformity of large-scale Mg-Gd-y-Zn-Zr alloy prepared by multi-pass friction stir processing

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2024年第5期12卷 2041-2056页

作者： Xiaohu Guan Wen wang Ting Zhang Pai Peng Qiang Liu Peng Han Ke Qiao Jun Cai Liqiang wang Kuaishe wang school of Metallurgical Engineering National and Local Joint Engineering Research Center for Functional Materials ProcessingXi’an University of Architecture and TechnologyNo.13 Yanta RoadXi’anShaanxi 710055China Xi’an Rare Metal Materials Institute Co.Ltd Xi’an 710016China state Key Laboratory of Metal Matrix Composites School of Material Science and EngineeringShanghai Jiao Tong UniversityNo.800 Dongchuan RoadShanghai 200240China

A large-scale fine-grained Mg-Gd-y-Zn-Zr alloy plate with high strength and ductility was successfully prepared by multi-pass friction stir processing(MFsP)technology in this *** structure of grains and long period stacking ordered(LPsO)phase were characterized,and the mechanical properties uniformity was ***,a quantitative relationship between the microstructure and tensile yield strength was *** results showed that the grains in the processed zone(PZ)and interfacial zone(IZ)were refined from 50μm to 3μm and 4μm,respectively,and numerous original LPsO phases were *** IZ,some block-shaped 18R LPsO phases were transformed into needle-like 14H LPsO phases due to stacking faults and the short-range diffusion of solute *** severe shear deformation in the form of kinetic energy caused profuse stacking fault to be generated and move rapidly,greatly increasing the transformation rate of LPsO *** MFsP,the ultimate tensile strength,yield strength and elongation to failure of the large-scale plate were 367 MPa,305 MPa and 18.0% *** refinement and LPsO phase strengthening were the major strengthening mechanisms for the MFsP *** particularly,the strength of IZ was comparable to that of PZ because the strength contribution of the 14H LPsO phase offsets the lack of grain refinement strengthening in *** result opposes the widely accepted notion that IZ is a weak region in MFsP-prepared large-scale fine-grained plate.

关键词： Friction stir processing Multi-pass Mg-Gd-y-Zn-Zr alloy LPsO phase transformation Mechanical properties

Development and Catalytic Cracking Performance of Ultrastable y Zeolite Rich in secondary Pores

在线全文

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical Technology 2024年第2期26卷 13-21页

作者： Li Jiaxing wang shengji sha Hao wang Juan Zhou Lingping wang Lixia sINOPEC Research Institute of Petroleum Processing Co. LtdBeijing 100083China Catalyst Co. Ltd.Qilu BranchSINOPECZibo 255336China

A novel ultra-stable zeolite, NsZ, rich in secondary pores was developed through the combination of gas-phase andmild hydrothermal methods. This zeolite was successfully tested in an industrial setting for the first time in the world. The porestructure characteristics of the NsZ zeolite prepared for industrial use were analyzed and characterized using BET. The resultsindicate a significant increase in the secondary pore volume of NsZ zeolite compared to the existing ultra-stable zeolite HsZ-5, which is produced through a conventional gas-phase method. The average secondary pore volume to total pore volume ratioin NsZ zeolite was found to be 58.96% higher. The catalytic cracking performance of NsZ zeolite was evaluated. The resultsshowed that the NsC-LTA catalyst, with NsZ as the active component, outperformed the HsC-LTA catalyst with HsZ-5 zeolitein terms of obtaining more high-value products (gasoline and liquefied petroleum gas) during the hydrogenated light cycle oilprocessing. Additionally, the NsC-LTA catalyst showed a significant improvement in coke selectivity.

关键词： gas-phase ultra-stable zeolite catalyst catalytic cracking

Effect of y and Ce Micro-alloying on Microstructure and Hot Tearing of As-Cast Al-Cu-Mg Alloy

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica sinica(English Letters) 2024年第6期37卷 939-952页

作者： Chunyu yue Bowen Zheng Ming su yuxiang wang Xiaojiao Zuo yinxiao wang Xiaoguang yuan school of Materials science and Engineering Shenyang University of TechnologyShenyang110870China Institute of Metal Research Chinese Academy of SciencesShenyang110016China

In this work,the Al-Cu-Mg alloy with different y(0-0.2 wt%)and Ce(0.5-1.5 wt%)are *** effect of mixed addition of y and Ce on the grain structure and hot tearing for Al-4.4Cu-1.5Mg-0.15Zr alloy was investigated using"cross"hot tearing *** results indicate that as rare earth y and Ce increases,the grain size becomes finer,the grain morphology changes from dendrite to equiaxed grain,and effectively reduce the hot tearing sensitivity coefficient(HTs1)and crack susceptibility coefficient(CsC)of the *** the increase of Ce element(0.5-1.5 wt%),the hot tearing susceptibility of the alloy decreases first and then *** the increase of y element(0-0.2 wt%),the hot tearing sensitivity of the alloy *** the content of rare earth is 0.2 wt%y+1.0 wt%Ce,the minimum HTs1 value and CsC value of the alloy are 68 and 0.53,*** earth Ce refines the alloy microstructure,shortens the feeding channel,and reduces the hot tearing ***,the rare earth y can form Al6Cu6y phase at the grain boundary,improve the feeding capacity of the ***,appropriate addition of rare earth y and Ce can effectively reduce the hot tearing tendency of the alloy.

关键词： Al-Cu-Mg alloy y and Ce Microstructure Thermal analysis Hot tearing sensitivity

Advances of high-performance LiNi_(1-x-y)Co_(x)M_(y)O_(2) cathode materials and their precursor particles via co-precipitation process

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Particuology 2024年第3期86卷 67-85页

作者： Wenbiao Liang yin Zhao Liyi shi Zhuyi wang yi wang Meihong Zhang shuai yuan school of Materials science and Engineering Shanghai UniversityShanghai200444China Research Center of Nanoscience and Nanotechnology Shanghai UniversityShanghai200444China Emerging Industries Institute Shanghai UniversityJiaxingZhejiang314006China

Layered LiNi_(1-x-y)Co_(x)M_(y)O_(2)(M=Mn or Al)is a promising cathode material for lithium-ion batteries due to its high specific capacity and acceptable manufacturing ***,the polycrystalline LiNi_(1-x-y)Co_(x)M_(y)O_(2) cathode material suffers from disordered orientation of primary particles and poor geometric symmetry of secondary particles,which severely hampers the migration of Lit ***,the resulting anisotropy accelerates the disintegration of the secondary particle structure,significantly affecting the electrochemical performance of the polycrystalline *** spite of less grain boundary,the single-crystal LiNi_(1-x-y)Co_(x)M_(y)O_(2) cathodes still suffer from severe microcracks generated by repeated planar gliding during cycling,which poses a great challenge to the cycling stability of single-crystal ***'s worth noting that the microstructure of the cathode material is mainly inherited from its ***,it is necessary to deeply understand the influence of the microstructure of Ni_(1-x-y)Co_(x)M_(y)(OH)2 on the electrochemical properties of LiNi_(1-x-y)Co_(x)M_(y)O_(2) cathode materials,so as to optimize the production process of preparing high-performance cathode *** this review,we summarize recent advances in the research and development of Ni-rich cathode precursor ***,the challenges faced by the Ni-rich hydroxide precursor materials are presented,including the effect of primary particle morphology and arrangement on the electrochemical performance of cathode materials,the influence of secondary particle morphology on lithium insertion reactions in cathode,and the effect of particle size on the microcracking of single-crystal ***,the presentation of the conventional co-precipitation reactor,the mechanism of precursor particle growth,and the influence of coprecipitation parameters are described in ***,the strategies are systematically discussed to solve the cha

关键词： Lithium-ion batteries Cathode materials Co-precipitation Ni-rich layered oxides single crystal Precursor particles

Mechanical properties and thermal deformation behavior of low-cost titanium matrix composites prepared by a structure-optimized y_(2)O_(3) crucible

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and steel Research International 2024年第3期31卷 738-751页

作者： Qian Dang Gang Huang ye wang Chi Zhang Guo-huai Liu Zhao-dong wang The state Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina school of Materials science and Chemical Engineering Harbin University of Science and TechnologyHarbin 150004HeilongjiangChina school of Materials science and Engineering Shenyang University of TechnologyShenyang 110870LiaoningChina

A porous yttrium oxide crucible with both thermal shock resistance and erosion resistance was developed by structural *** structure-optimized yttrium oxide crucible was proved to be suitable for melting highly reactive titanium ***-cost(TiB+y2O_(3))-reinforced titanium matrix composites were prepared by vacuum induction melting using the prepared *** thermal deformation behavior and microstructure evolution of(TiB+y2O_(3))-reinforced tita-nium matrix composites were investigated at deformation temperatures of 900-1100℃with strain rates of 0.001-1 *** results showed that the prepared yttrium oxide crucible had both thermal shock and erosion resistance,the low-cost titanium matrix composites could be prepared by the developed yttrium oxide crucibles which were homogeneous in composition and highly sensitive to strain rate and deformation temperature,and the peak and theological stresses decreased with increasing deformation temperature or decreasing strain *** addition,the average thermal deformation activation energy of the composites was calculated to be 574.6 kJ/mol by establishing the Arrhenius constitutive equation in consideration of the strain variables,and the fitting goodness between the predicted stress value and the measured value was 97.624%.The calculated analysis of the hot processing map showed that the best stable thermal deformation zone was located in the deformation temperature range of 1000-1100℃and strain rate range of 0.001-0.01 s^(-1),where the peak dissipation coefficient wasη=71%.In this zone,the deformation of the reinforcement and matrix was harmonious,the reinforcement was less likely to fracture,dynamic recrystallization occurred more fully and the alloy exhibited near steady rheological characteristics.

关键词： yttrium oxide crucible Titanium matrix composite Thermal deformation behavior Constitutive equation Hot processing map Microstructure evolution

Optimization of chemistry and process parameters for control of intermetallic formation in Mg sludges

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2024年第4期12卷 1431-1448页

作者： y.Fu G.G.wang A.Hu y.Li K.B.Thacker J.P.Weiler H.Hu Department of Mechanical Automotive and Materials EngineeringUniversity of Windsor401 Sunset AveWindsorOntario N9B 3P4Canada Global Technology Centre Meridian Lightweight Technologies25 MacNab AveStrathroyOntario N7G 4H6Canada

Intermetallic formation in sludge during magnesium(Mg)melting,holding and high pressure die casting practices is a very important ***,very often it is overlooked by academia,original equipment manufacturers(OEM),metal ingot producers and even die *** aim of this study was to minimize the intermetallic formation in Mg sludge via the optimization of the chemistry and process *** Al8Mn5 intermetallic particles were identified by the microstructure analysis based on the Al and Mn *** design of experiment(DOE)technique,Taguchi method,was employed to minimize the intermetallic formation in the sludge of Mg alloys with various chemical compositions of Al,Mn,Fe,and different process parameters,holding temperature and holding *** sludge yield(sy)and intermetallic size(Is)was selected as two *** optimum combination of the levels in terms of minimizing the intermetallic formation were 9 wt.%Al,0.15 wt.%Mn,0.001 wt.%(10 ppm)Fe,690℃ for the holding temperature and holding at 30 mins for the holding time,*** best combination for smallest intermetallic size were 9 wt.%Al,0.15 wt.%Mn,0.001 wt.%(10 ppm)Fe,630℃ for the holding temperature and holding at 60 mins for the holding time,*** groups of sludge factors,Chemical sludge(CsF),Physical sludge(PsF)and Comprehensive sludge Factors(and CPsF)were established for prediction of sludge yields and intermetallic sizes in Al-containing Mg *** CPsF with five independent variables including both chemical elements and process parameters gave high accuracy in prediction,as the prediction of the PsF with only the two processing parameters of the melt holding temperature and time showed a relatively large deviation from the experimental *** Chemical sludge Factor was primarily designed for small ingot producers and die casters with a limited melting and holding capacity,of which process parameters could be fixed *** Physical sludge Factor could be used f

关键词： Magnesium sludge Al-Mn intermetallic Optimization Taguchi method sludge factor Chemical composition Process parameter

Long-wave infrared emission properties of strain-balanced InAs/In_(x)Ga_(1-x)As_(y)sb_(1-y)type-Ⅱsuperlattice on different substrates

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第7期43卷 3194-3204页

作者： Chao shi Xuan Fang Hong-Bin Zhao Deng-Kui wang Xi Chen Dan Fang Dong-Bo wang Xiao-Hua wang Jin-Hua Li state Key Laboratory of High Power semiconductor Lasers School of PhysicsChangchun University of Science and TechnologyChangchun 130022China state Key Laboratory of Advanced Materials for smart sensing China General Research Institute for Nonferrous MetalsBeijing 100088China Department of Opto-Electronic Information science School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China

High-performance type-Ⅱsuperlattices ofⅢ-Ⅴsemiconductor materials play an important role in the development and application of infrared optoelectronic *** the quality of epitaxial materials and clarifying the luminescent mechanism are of great significance for practic al applic *** this work,strain-balanced and high-quality In As/In_(x)Ga_(1-x)As_(y)sb_(1-y)superlattices without lattice mismatch were achieved on InAs and Gasb substrates *** grown on In As substrate could exhibit higher crystal quality and surface flatness based on high-resolution X-ray diffraction(HRXRD)and atomic force microscopy(AFM)measurements'***,the strain distribution phenomenon from geometric phase analysis indicates that fluctuations of alloy compositions in superlattices on Gasb substrate are more *** addition,the optical properties of superlattices grown on different substrates are discussed *** of the difference in fluctuations of element composition and interface roughness of superlattices on different substrates,the superlattices grown on In As substrate would have higher integral intensity and narrower full-width at half maximum of long-wave infrared ***,the thermal quenching of emission intensity indicates that the superlattices grown on the In As substrate have better recombination ability,which is beneficial for increasing the operating temperature of infrared optoelectronic devices based on this type of superlattices.

关键词： Photoluminescence Alloy compositions fluctuations InAs(sb)/In_(x)Ga_(1-x)As_(y)sb_(1-y) Type-Ⅱsuperlattice substrate