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High strength and ductility of titanium matrix composites by nanoscale design in selective laser melting

Journal of Materials Science & Technology 2022年第23期118卷 114-127页

作者： Joseph A.Otte jin zou Matthew S.Dargusch School of Mechanical and Mining Engineering The University of QueenslandBrisbaneQLD 4072Australia Center for Microscopy and Microanalysis The University of QueenslandBrisbaneQLD 4072Australia

The use of selective laser melting(SLM)to produce titanium matrix composites(TMCs)with high strength while retaining sufficient tensile ductility suitable for structural applications is emerging as an attractive opportunity in the field of advanced ***,the presence of coarse ceramic reinforcements as well as difficulties in optimizing the SLM process is a barrier to the application of *** this study,we demonstrated the production of TMCs reinforced with in situ high aspect ratio Ti B nanowhiskers by selective laser melting using nanosized BN powder *** Ti with 2.5 vol.%nanosized BN powder showed promise for producing high performance TMCs with retained *** acted to produce Ti B nanowhiskers with diameter<50 ***,by controlling post process furnace annealing Ti B retained a low diameter but exhibited a high aspect ratio,up to *** addition to Ti B refinement,nanosized BN addition promoted grain refinement during SLM,both acting as a solute to induce nucleation events and,as Ti B is formed,providing nucleation sites leading to an ultrafine grain structure in as printed samples and after *** produced TMCs exhibit high tensile yield strength,up to1392 MPa,while retaining tensile ductility up to 10%.This study has shown how nanoscale design in powder bed fusion additive manufacturing techniques can be used to produce high performance TMCs through a combination of refined grain structure and high aspect ratio Ti B leading to TMCs with significant improvement in strength,isotropic properties and retained tensile ductility.

关键词： Additive manufacturing Selective laser melting Metal matrix composite Mechanical properties Nanostructure Nanowires

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Fundamental and progress of Bi_2Te_3-based thermoelectric materials

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Chinese Physics B 2018年第4期27卷 50-74页

作者： Min Hong Zhi-Gang Chen jin zou Centre of Future Materials the University of Southern Queensland （USQ） Springfield Queensland 4300 Australia Materials Engineering University of Queensland Brisbane Queensland 4072 Australia Centre for Microscopy and Microanalysis University of Queensland Brisbane Queensland 4072 Australia

Thermoelectric materials,enabling the directing conversion between heat and electricity,are one of the promising candidates for overcoming environmental pollution and the upcoming energy shortage caused by the over-consumption of fossil ***2Te3-based alloys are the classical thermoelectric materials working near room *** to the intensive theoretical investigations and experimental demonstrations,significant progress has been achieved to enhance the thermoelectric performance of Bi2Te3-based thermoelectric *** this review,we first explored the fundamentals of thermoelectric effect and derived the equations for thermoelectric *** this basis,we studied the effect of material parameters on thermoelectric ***,we analyzed the features of Bi2Te3-based thermoelectric materials,including the lattice defects,anisotropic behavior and the strong bipolar conduction at relatively high *** we accordingly summarized the strategies for enhancing the thermoelectric performance,including point defect engineering,texture alignment,and band gap ***,we highlighted the progress in decreasing thermal conductivity using nanostructures fabricated by solution grown method,ball milling,and melt ***,we employed modeling analysis to uncover the principles of anisotropy behavior and the achieved enhancement in Bi2Te3,which will enlighten the enhancement of thermoelectric performance in broader materials

关键词： thermoelectric Bi2Te3-based alloys electron transports phonon scatterings

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SYNTHESIS OF CHIRAL CONJUGATED POLYBINAPHTHYLS BY SONOGASHIRA REACTION

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Chinese Journal of Polymer Science 2006年第3期24卷 273-279页

作者：成义祥 Ling-wu Chen Xiao-wei zou jin-feng Song College of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 China

Chiral polymers P-1 and P-2 were synthesized by the polymerization of （R）-3,3＇-diiodo-2,2＇-bisbutoxy-1,1＇- binaphthyl （M- 1 ） with 2,5-di（4-ethynylphenyl）- 1,3,4-oxadiazole （M-3） and （R）-3,3＇-diethylnyl-2,2＇-bisbutoxy- 1,1 ＇-binaphthyl （M-2） with 1,2-di（4-bromophenyl）acetylene （M-4） under Sonogashira reaction, respectively. Both monomers and polymers were analyzed by NMR, MS, FT-IR, UV-Vis spectroscopy, DSC-TGA, fluorescence spectroscopy, GPC and CD spectroscopy. CD spectra of P-1 and P-2 are similar due to the same chiral center units and main chain structure. The long wavelengths CD effect of P-1 and P-2 can be regarded as the more extended conjugated structure and a highly rigid backbone in the polymer chain. Polymers have strong blue fluorescence due to the efficient energy migration from the extended n-electronic structure of the polymers to the chiral binaphthyl core and are expected to provide understanding of the relationship between molecular structure and fluorescent property of the chiral polymers.

关键词： (R)-BINOL Chiral conjugated polymer Sonogashira reaction Fluorescence.

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Morphological control of SnTe nanostructures by tuning catalyst composition

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Nano Research 2015年第9期8卷 3011-3019页

作者： Yichao zou Zhigang Chen jing Lin Xiaohao Zhou Wei Lu John Drennan jin zou Materials Engineering The University of Queensland Brisbane QLD 4072 Australia National Laboratory for Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences 500 Yu-Tian Road Shanghai 200083 China Centre for Microscopy and Microanalysis The University of Queensland Brisbane QLD 4072 Australia

A method of controlling the morphology of SnTe nanostructures produced by a simple chemical vapor deposition is presented, in which Au-containing catalysts with different Au concentrations are used to induce specific growth behavior. Triangular SnTe nanoplates with a {100} dominated surface and {100}, {111} and {120} side facets were induced by AuSn catalysts, whereas 〈010〉 SnTe nanowires with four nonpolar {100} side-facets were produced using AusSn catalysts. Through detailed structural and chemical characterization, coupled with surface energy calculations, it is found that nanowire growth is thermodynamically controlled via a vapor-solid-solid growth mechanism, whereas nanoplate growth is kinetically controlled via a vapor-liquid-solid growth mechanism. Therefore, this study provides a fundamental understanding of the catalyst＇s role in the growth of IV-VI compound nanostructures.

关键词： tin telluride,chemical vapor deposition,morpholog'ficatalyst composition,topological insulator,thermoelectrics

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Effect of cooling rate during quenching on the microstructure and creep property of nickel-based superalloy FGH96

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International Journal of Minerals,Metallurgy and Materials 2019年第4期26卷 493-499页

作者： Ye-fei Feng Xiao-ming Zhou jin-wen zou Gao-feng Tian Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials

The effect of cooling rate during quenching on the microstructure and creep property of nickel-based superalloy FGH96 was investigated. Three groups of samples were quenched continuously with three fixed cooling rates, respectively, then subjected to a creep test under a constant load of 690 MPa at 700℃. Clear differences in size of secondary γ′ precipitates, creep properties and substructure of creep-tested samples were observed. The quantitative relationship among cooling rate, the size of secondary γ′ precipitates, and steady creep rate was constructed. It was found that with increasing cooling rate, the size of secondary γ′ precipitates decreases gradually, showing that the relationship between the size of secondary γ′ precipitates and the cooling rate obeys a power law, with an exponent of about –0.6, and the creep rate of steady state follows a good parabola relationship with cooling γ′ precipitate size. For 235℃/min, FGH96 alloy exhibited very small steady creep rate. The density of dislocation was low, and the isolated stacking fault was the dominant deformation mechanism. With decreasing cooling rates, the density of dislocation increased remarkably, and deformation microtwinning was the dominant deformation process. Detailed mechanisms for different cooling rate were discussed.

关键词： quantitative relationship cooling rate secondaryγ′precipitates steady creep rate deformation mechanism

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Structure and quality controlled growth of InAs nanowires through catalyst engineering

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Nano Research 2014年第11期7卷 1640-1649页

作者： ZhiZhang Zhenyu Lu Hongyi Xu Pingping Chen Wei Lu jin zou Materials Engineering The University of Queensland St. Lucia Queensland 4072 Australia National Laboratory for Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences 500 Yu-Tian Road Shanghai 200083 China Centre for Microscopy and Microanalysis The University of Queensland St. Lucia Queensland 4072 Australia

In this study, the structure and quality controlled growth of InAs nanowires using Au catalysts in a molecular beam epitaxy reactor is presented. By tuning the indium concentration in the catalyst, defect-free wurtzite structure and defect-free zinc blende structure InAs nanowires can be induced. It is found that these defect-free zinc blende structure InAs nanowires grow along 〈110〉 directions with four low-energy {111} and two {110} side-wall facets and adopt the （111） catalyst/nanowire interface. Our structural and chemical characterization and calculations identify the existence of a catalyst supersaturation threshold for the InAs nanowire growth. When the In concentration in the catalyst is sufficiently high, defect-free zinc blende structure InAs nanowires can be induced. This study provides an insight into the manipulation of crystal structure and structure quality of III-V semiconductor nanowires through catalyst engineering.

关键词： structure quality InAs nanowires molecular beam epitaxy (MBE) Au catalysts

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Present status and future prospect of design of Pt-cerium oxide electrodes for fuel cell applications

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Progress in Natural Science:Materials International 2012年第6期22卷 561-571页

作者： Toshiyuki Mori Ding Rong Ou jin zou John Drennan Graduate School of Chemical Sciences and Engineering.Hokkaido University Kita13Nishi8Kita-ku.Sapporo.Hokkaido 060-8628.Japan Hetero interface design group.Global Research Center for Environment and Energy based on Nanomaterials Science(GREEN).National Institute for Materials Science.1-1 Namiki Tsukuba.Ibaraki 305-0044.Japan Centre for Microscopy and Microanalysis The University of QueenslandSt.LuciaBrisbaneQld 4072Australia Laboratory of Fuel Cells Dalian Institute of Chemical Physics Chinese Academy of Sciences457 Zhongshan RoadDalian

In the research field of proton exchange membrane fuel cells,the design of electrocatalytic activities on Pt-oxide promoter in the anode side has attracted attention for improvement of CO tolerance of Pt in anode side and a lowering of large over-potential loss of the oxygen reduction reaction on the cathode in the fuel *** the Pt-oxide promoter series,Pt-CeOx/C is one of the unique *** is because the unique behavior of CeOxsuch as electrochemical redox reaction between Ce3+and Ce4+in the anodic and cathodic reactions of fuel cell is *** present short review gives an overview of the recent works for improvement of the CO tolerance of Pt in the Pt-CeOx/C anodes and enhancement of the oxygen reduction reaction activity on Pt in the Pt-CeOx/C cathodes for fuel cell *** show the design paradigm for fabrication of high quality Pt-CeOx/C electrodes,the authors re-introduced parts of our research results to highlight the important role of interface structure of Pt-CeOxbased on the ultimate analysis results. The usefulness of the combined approach of microanalysis and the processing route design is presented.

关键词： Pt-CeO_x electrode CO tolerance of Pt Oxygen reduction reaction Interface of Pt and cerium oxide Microanalysis

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Unraveling the oxygen evolution activity of biomass-derived porous carbon plate as self-supported metal-free electrocatalyst for water splitting

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Progress in Natural Science:Materials International 2024年第5期34卷 967-976页

作者： Xinghe Zhang Yujie Wang jin zou Sushan Zhao Hongbo Hou Wenhua Yao Huaipeng Wang College of Resource and Environment Baoshan University School of Integrated Circuits Tsinghua University

Developing the efficient and low-cost electrocatalysts derived from biomass is a desired solution to address economy and sustainability challenges of hydrogen production from water electrolysis due to utilizing metalbased catalysts. Herein, the peeled cornstalk-derived porous carbon plates synthesized by salt template-assisted high-temperature pyrolysis are utilized as self-supported metal-free electrocatalysts to unravel the oxygen evolution activity for alkaline water splitting. The resultant PC-700-10 honeycomb carbon catalyst exhibits the superior electrocatalysis for oxygen evolution owning to its high specific surface area of 52.0 m2g-1, suitable microand meso-pores, electron-withdrawing pyridinic-N moiety and appropriate balance between hydrophilicity and electroconductivity. Theoretical calculations reveal that the largest energy barrier of forming *OOH limits the OER rate and *OH oxidation generates the energetically more favorable epoxide intermediate. This finding opens the way to construct the hopeful metal-free OER electrocatalysts via regulating their intrinsic structure, and inspires the applications of waste biomass in the energy-correlated fields.

关键词： Oxygen evolution reaction Cornstalk Hierarchical pore Pyridinic-N Self-supported

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Effects of intracoronary injection of nicorandil and tirofiban on myocardial perfusion and short-term prognosis in elderly patients with acute ST-segment elevation myocardial infarction after emergency PCI

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World Journal of Emergency Medicine 2020年第3期11卷 157-163页

作者： Guo-xiong Chen Hong-na Wang jin-lin zou Xiao-xu Yuan Department of Cardiology Zhoushan Hospital of Zhejiang ProvinceZhoushan 316000China

BACKGROUND:This study investigated the effects of the intracoronary injection of nicorandil and tirofiban on myocardial perfusion and short-term prognosis in elderly patients with acute ST-segment elevation myocardial infarction(STEMI)after emergency percutaneous coronary intervention(PCI).METHODS:Seventy-eight STEMI patients with age>65 years who underwent emergency PCI were consecutively *** patients received conventional PCI and were randomly divided into a control group and a treatment group(n=39 per group).The control group received an intracoronary injection of tirofiban followed by a maintenance infusion for 36 hours after *** treatment group received intracoronary injection of tirofiban and nicorandil,and then intravenous infusion of tirofiban and nicorandil 36 hours after *** following parameters were measured:TIMI grade,corrected TIMI frame count(c TFC),TIMI myocardial perfusion grade(TMPG),STsegment resolution(STR)rate 2 hours post-operatively,resolution of ST-segment elevation(STR)at 2 hours postoperatively,peak level of serum CK-MB,left ventricular end diastolic diameter(LVEDD)and left ventricular ejection fraction(LVEF)at 7–10 days postoperatively,and major adverse cardiac events(MACEs)in-hospital and within 30 days ***:Compared with the control group,more patients in the treatment group had TIMI 3 and TMPG 3,and STR after PCI was significantly *** treatment group also had significantly lower c TFC,lower infarction relative artery(IRA),lower peak CK-MB,and no reflow ratio after *** treatment group had significantly higher LVEDD and LVEF but lower incidence of MACEs than the control ***:The intracoronary injection of nicorandil combined with tirofiban can effectively improve myocardial reperfusion in elderly STEMI patients after emergency PCI and improve shortterm prognoses.

关键词： Acute ST-elevation myocardial infarction Elderly Emergency coronary intervention Nicorandil Tirofiban Myocardial reperfusion

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Axiotaxy driven growth of belt-shaped InAs nanowires in molecular beam epitaxy

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Nano Research 2021年第7期14卷 2330-2336页

作者： Qiang Sun Dong Pan Xutao Zhang Jianhua Zhao Pingping Chen Wei Lu jin zou School of Materials Engineering University of QueenslandQueensland 4072Australia Centre for Microscopy and Microanalysis The University of QueenslandQueensland 4072Australia State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China School of Physical Science and Technology Northwestern Polytechnical UniversityXi'an 710129China State Key Laboratory for Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083China

In this study,we demonstrate the axiotaxy driven growth of belt-shaped InAs nanowires using Au catalysts by molecular beam *** is found that,the zinc-blende structured InAs nanowires,with the features of[113]growth direction and extensive{110}side-surfaces,are induced by catalysts in Au–In α phase through the axiotaxy growth,in which the lattice mismatch between the projections of atomic planes onto nanowire/catalyst interfaces is minimized by forming extraordinary tilted *** atomic-resolution in situ TEM heating experiments show that the catalysts remained in the solid state of Au–In α phase during the axiotaxy growth,by which the vapor–solid–solid growth mechanism can be *** manipulating the growth direction,this unusual growth mechanism can provide a practical pathway to control the morphology of the low-dimensional nanomaterials,from conventional nanowires to belt-shaped nanowires utilizing a significant lateral growth,simply using nanoparticles as catalyst.

关键词： InAs nanowire axiotaxy molecular beam epitaxy

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