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Overcoming the strength-ductility trade-off by tailoring grain-boundary metastable Si-containing phase in β-type titanium alloy

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Journal of Materials Science & Technology 2021年第9期68卷 112-123页

作者： x.luo L.H.Liu C.Yang H.Z Lu H.W.Ma Z.Wang D.D.Li L.C.Zhang Y.Y.Li National Engineering Research Center of Near-net-shape Forming for Metallic Materials South China University of TechnologyGuangzhou510640China State Key Laboratory of Materials Processing and Die&Mould Technology Huazhong University of Science and TechnologyWuhan430074China Key Laboratory of Automobile Materials of MOE Department of Materials ScienceJilin UniversityChangchun130012China School of Engineering Edith Cowan University270Joondalup DriveJoondalupPerthWA 6027Australia

It is well accepted that grain-boundary phases in metallic alloys greatly deteriorate the mechanical *** our work,we report on a novel strategy to prepare high strength-ductility β-type(Ti69.71 Nb23.72Zr4.83Ta1.74)97Si3(at.%)(TNZTS) alloys by tailoring grain-boundary metastable Si-containing ***,the thin shell-shaped metastable S1 phase surrounding the columnar β-Ti grain was intercepted successfully via nonequilibrium rapid solidification achieved by selective laser melting(SLM).Subsequently,the thin shell-shaped metastable(Ti,Nb,Zr)5 Si3(called S1) phase was transformed into globular(Ti,Nb,Zr)2 Si(called S2) phase by the solution heat ***,the globular S2 phases reinforced TNZTS alloy exhibits ultrahigh yield strength of 978 MPa,ultimate strength of 1010 MPa and large elongation of 10.4 %,overcoming the strength-ductility trade-off of TNZTS alloys by various ***,the reported yield strength herein is 55 % higher than that of conventionally forged TNZT *** analysis indicates the globularization process of the metastable S1 phase is controlled by the model of termination *** quantitative analysis on strengthening mechanism demonstrates that the increase in yield strength of the heat-treated alloys is mainly ascribed to the strengthening of the precipitated silicide and the dislocations induced by high cooling *** obtained results provide some basis guidelines for designing and fabricating β-titanium alloys with excellent mechanical properties,and pave the way for biomedical application of TNZTS alloy by SLM.

关键词： Selective laser melting βtitanium alloys Heat treatment

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Simultaneous enhancement of mechanical and shape memory properties by heat-treatment homogenization of Ti_(2)Ni precipitates in TiNi shape memory alloy fabricated by selective laser melting

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Journal of Materials Science & Technology 2022年第6期101卷 205-216页

作者： H.Z.Lu L.H.Liu C.Yang x.luo C.H.Song Z.Wang J.Wang Y.D.Su Y.F.Ding L.C.Zhang Y.Y.Li National Engineering Research Center of Near-net-shape Forming for Metallic Materials South China University of TechnologyGuangzhou 510640China Musculoskeletal Oncology Department Sun Yat-Sen University Cancer CenterGuangzhouGuangdong ProvinceChina Shenyang Aircraft Design and Research Institute Shenyang 110035China Guangdong Huayi Plumbing Fittings Industry Co. Ltd.Kaiping 529321China School of Engineering Edith Cowan University270 Joondalup DriveJoondalupPerthWA 6027Australia

The excellent shape memory and mechanical properties of Ti Ni shape memory alloys(SMAs) fabricated using selective laser melting(SLM) are highly desirable for a wide range of critical applications. In this study, we examined the simultaneous enhancement of mechanical and shape memory properties using heat-treatment homogenization of Ti_(2)Ni precipitates in a Ti_(50.6)Ni_(49.4)SMA fabricated using SLM. Specifically, because of the complete solution treatment, nanoscale spherical Ti_(2)Ni precipitates were homogeneously dispersed throughout the grain interior. Interestingly, the resultant SMA exhibited an ultrahigh tensile strength of 880 ± 13 MPa, a large elongation of 22.4 ± 0.4%, and an excellent shape memory effect, with a recovery rate of > 98% and ultrahigh recoverable strain of 5.32% after ten loading–unloading cycles. These simultaneously enhanced properties are considerably superior than those of most previously reported Ti Ni SMAs fabricated using additive manufacturing. Fundamentally, the enhancement in tensile strength is ascribed to precipitation strengthening and work hardening, and the large plasticity is mainly attributed to the homogeneous nanoscale globular Ti_(2)Ni precipitates, which effectively impeded the rapid propagation of microcracks. Furthermore, the enhanced shape memory properties are derived from the suppression of dislocation movement and formation of retained stabilized martensite by the presence of high-density dislocations, nanoscale Ti_(2)Ni precipitates, and abundant interfaces. The obtained results provide insight into the enhancement of the two types of properties in Ti Ni SMAs and will accelerate the wider application of SMAs.

关键词： Shape memory alloy Selective laser melting Heat treatment Mechanical properties Shape memory properties

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二次运移中含油饱和度及其损失的实验性鉴定

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国外油气地质信息 2004年第4期 65-71页

作者： x.luo 方帆李大荣

在石油二次运移中，准确估算油气损失对于正确评价含油气系统是极其重要的。本文利用建立在两相不混溶排驱方法基础上的实验室试验数据，讨论了油气运移通道的形成和相应的油气损失。这些实验允许我们研究运移通道的形成、非润湿性原油... 详细信息

在石油二次运移中，准确估算油气损失对于正确评价含油气系统是极其重要的。本文利用建立在两相不混溶排驱方法基础上的实验室试验数据，讨论了油气运移通道的形成和相应的油气损失。这些实验允许我们研究运移通道的形成、非润湿性原油沿运移通道的分布，以及通过运移原油的后续脉冲研究原有运移通道的再利用。运移通道的结构型式可以用一种相态图来表征，其坐标是两个无因次数，即毛细管数和帮德数(浮力的一种度量值)。利用核磁共振(NMR)成像测量通道内残余油饱和度。在分辨率为0．4mm的条件下，已发现油气运移后通道内的平均残余油饱和度一般小于40％。运移中的油气损失是利用空间分辨率所确定的运移烃簇结构体积比乘以通道中的平均残余油饱和度估算出来的。

关键词：含油饱和度实验性残余油饱和度鉴定石油二次运移油气运移通道含油气系统空间分辨率试验数据结构型式毛细管数测量通道核磁共振实验室不混溶润湿性再利用无因次度量值体积比簇结构估算原油平均相态

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Study on Multi-stream Heat Exchanger Network Synthesis with Parallel Genetic/Simulated Annealing Algorithm

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Chinese Journal of Chemical Engineering 2004年第1期12卷 66-77页

作者：魏关锋姚平经 luoxing ROETZELWilfried InstituteofProcessSystemsEngineering DalianUniversityofTechnologyDalian116012China InstituteofThermodynamics UniversityoftheFederalArmedForcesHamburgD-22039HamburgGermany

The multi-stream heat exchanger network synthesis (HENS) problem can be formulated as a mixed integer nonlinear programming model according to Yee et al. Its nonconvexity nature leads to existence of more than one optimum and computational difficulty for traditional algorithms to find the global optimum. Compared with deterministic algorithms, evolutionary computation provides a promising approach to tackle this problem. In this paper, a mathematical model of multi-stream heat exchangers network synthesis problem is setup. Different from the assumption of isothermal mixing of stream splits and thus linearity constraints of Yee et al., non-isothermal mixing is supported. As a consequence, nonlinear constraints are resulted and nonconvexity of the objective function is added. To solve the mathematical model, an algorithm named GA/SA (parallel genetic/simulated annealing algorithm) is detailed for application to the multi-stream heat exchanger network synthesis problem. The performance of the proposed approach is demonstrated with three examples and the obtained solutions indicate the presented approach is effective for multi-stream HENS.

关键词： multi-stream heat exchanger network synthesis non-isothermal mixing mixed integer nonlinear programming model genetic algorithm simulated annealing algorithm hybrid algorithm

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On Condensation Induced Shock Waves

On Condensation Induced Shock Waves

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第十届全国激波与激波管学术讨论会

作者： M.E.H.van Dongen x.luo G.Lamanna D.J.van Kaathoven Technische Universiteit Eindhoven P.O Box 5135600 MB EindhovenThe Netherlands

Effects of heat release due to cloud formation in compressible flows are discussed. It is shown that the onset of a localized constant heat flux to a 1D compressible flow leads to the generation of up

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Phase structures and hydrogen storage properties of non-stoichiometric Ti0.95Zr0.15Mn1.4+xMo0.1Cr0.2V0.2(x=0-0.3) alloys

Phase structures and hydrogen storage properties of non-stoi...

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第九届全国氢能学术会议

作者： x.luo,L.x.Chen,x.L.Fan,Z.Wu,Zh.M.Hang,S.Q.Li Zhejiang University,China

To develop a suitable material for hydrogen storage tank,the non-stoichiometric TiZrMnMoCrV(x=0,0.1,0.2,0.3) alloys were prepared,and their phase structure and hydrogen storage properties have been *** results show that all the alloys consist of a single C14 Laves phase with hexagonal structure,and the unit cell volume

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Biogenic spherical magnetite and coffinite from a sandstone-type uranium deposit in the Dongsheng area

Biogenic spherical magnetite and coffinite from a sandstone-...

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中国科学院地质与地球物理研究所2007学术年会

作者： H.Li,C.Cai,K.Li & x.luo Key lab of Mineral Resources,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,PR China

Spherical magnetite and rod-shaped coffinite have been intergrown with pyrite and calcite cement in the Dongsheng sandstone-type uranium *** order to assess the origin of magnetite and coffinite,the host sandstone has been analyzed for fluid inclusion oil biomarkers,pyriteδS,calciteδC and observed under *** results show that fluid inclusion oils are characterized by"UCM"and significant amounts of 25-norhopanes,suggesting biodegradation of the *** in pyrite originated from bacterial sulfate reduction as indicated by lowδS values,and calcite cement has petroleum-derived *** of biogenic pyrite with calcite cement that has petroleum-derived carbon,suggests that petroleum was likely oxidized by sulfate-reducing bacteria(SRB).SRB could have depleted petroleum and reduced Fe(Ⅲ) and U(Ⅵ) to Fe(Ⅱ) and U(Ⅳ),respectively,by anaerobic respiration,resulting in magnetite and coffinite formation.

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Exploring practical methods for detecting k-nonseparability in multipartite quantum states

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 255-256页

作者： Shunlong luo Academy of Mathematics and Systems Science Chinese Academy of Sciences

Quantum entanglement, referred to as “spooky action at a distance” by Einstein, is not only an intriguing and fascinating feature of quantum theory challenging our classical intuitions about locality and correlations, but also has practical and profound implications for quantum technologies. Initially described by Einstein, Podolsky and Rosen, as well as by Schro¨dinger, entanglement now has become a basic and crucial ingredient for both foundational and experimental investigations of the quantum world.

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In situ polymerization of poly(3,4-ethylenedioxythiophene)protective layer towards stable zinc anode

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Nano Research 2025年第1期18卷 382-394页

作者： Debin luo Peng Zhou xiaowei Lv Panpan Sun xiaohua Sun Hewei Zhao College of Materials and Chemical Engineering Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion MaterialsChina Three Gorges UniversityYichang 443002China Hubei Three Gorges Laboratory Yichang 443007China School of Chemistry Beihang UniversityBeijing 100191China

Aqueous zinc-ion devices are considered promising candidates for energy storage due to their high safety,low cost and relatively high energy ***,the dendrite growth,hydrogen evolution reaction(HER)and corrosion of the zinc anode significantly limit the development of Zn-ion ***,an inexpensive poly(3,4-ethylenedioxythiophene)(PEDOT)protective layer was constructed in situ on the Zn surface using electropolymerization to suppress dendrite growth and side reactions,thereby enhancing the reversibility of *** and theoretical calculations revealed that this hydrophilic protective layer promotes the desolvation process of hydrated Zn^(2+)and facilitates the transport of zinc ions,thus improving the thermodynamic and kinetic properties of Zn^(2+)deposition and inhibiting interfacial side ***,the optimized PEDOT@Zn symmetric battery exhibited a cycling stability exceeding 1250 h at 0.5 mA·cm^(-2)and 0.25 mAh·cm^(-2),with a significantly reduced overpotential(from 91.8 to 35 mV).With the assistance of the PEDOT protective layer,the PEDOT@Zn//Cu battery maintained approximately 99.5%Coulombic efficiency after 450 ***-situ scanning electron microscopy(SEM)and in situ optical microscopy characterizations further confirmed that the PEDOT protective layer can effectively suppress the growth of zinc ***,the Zn-ion capacitors assembled by the PEDOT@Zn and activated carbon also demonstrated outstanding cycling stability.

关键词： zinc-ion devices zinc anode poly(3 4-ethylenedioxythiophene)(PEDOT) dendrite desolvation process

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Tilting homeostatic and dyshomeostatic microglial balance in health and disease:transforming growth factor-beta1 as a critical protagonist

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Neural Regeneration Research 2025年第10期20卷 2895-2897页

作者： Nicolas Hugues Yu luo Department of Molecular and Cellular Biosciences University of CincinnatiCincinnatiOHUSA Neuroscience Graduate Program University of CincinnatiCincinnatiOHUSA Division of Immunobiology Cincinnati Children’s Hospital Medical CenterUniversity of Cincinnati College of MedicineCincinnatiOHUSA

Adult microglia,by continuously sensing changes in their environment and communicating with nearly all brain cell types,are considered to be the immune sentinels of the *** the healthy central nervous system(CNS),microglia display a unique molecular homeostatic signature(i.e.,Tmem119,P2ry12,Sall1,Siglech,Gpr34,and Hexb)(Figure 1A).

关键词： Figure signature critical

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