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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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Charge self-trapping in two strand biomolecules:Adiabatic polaron approach

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Chinese Physics B 2023年第1期32卷 253-263页

作者： d Chevizovich S zdravković A V Chizhov z Ivić University of Belgrade Vinča Institute of Nuclear SciencesP.O.Box 522Belgrade 11001Serbia Joint Institute for Nuclear Research Laboratory for Radiation BiologyDubna 141980Russia dubna State University Dubna 141980Russia department of Physics University of CreteP.O.Box 2208Heraklion 71003Greece National University of Science and Technology MISiS Leninsky prosp.4Moscow 119049Russia

We investigate the properties of the excess charge(electron, hole) introduced into a two-strand biomolecule. We consider the possibility that the stable soliton excitation can be formed due to interaction of excess charge with the phonon subsystem. The influence of overlap of the molecular orbitals between adjacent structure elements of the macromolecular chain on the soliton properties is discussed. Special attention is paid to the influence of the overlapping of the molecular orbitals between structure elements placed on the different chains. Using the literature values of the basic energy parameters of the two-chain biomolecular structures, possible types of soliton solutions are discussed.

关键词： charge self-trapping adiabatic polaron soliton two-stranded biomolecules

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Static spheroidization and its effect on superplasticity of fine lamellae in nugget of a friction stir welded Ti-6Al-4V joint

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Journal of Materials Science & Technology 2022年第24期119卷 1-10页

作者： C.L.Jia L.H.Wu P.Xue H.zhang d.R.Ni B.L.Xiao z.Y.Ma Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The spheroidization of the lamellar structure can greatly contribute to the superplasticity of the nugget zone(Nz)of Ti alloy welds,which is the key to achieve the integral superplastic forming of welds for the fabrication of large-scale complex ***,the spheroidization process is complex and costly since it cannot be obtained generally,unless the lamellae suffers from a large *** this study,the static spheroidization was achieved for the fine lamellae structure in the nugget of a friction stir welded(FSW)Ti-6Al-4V joint,particularly by the annealing without any *** specialα/βinterface obeying a Burgers orientation relationship(BOR)after FSW was first time directly observed,whose effect on the spheroidization was discussed.A new static spheroidization mechanism with the gradual coalescence of the adjacent lamellae was discovered,which we named as“termination coalescence”.There was a slower coarsening rate in the lamellar structure than in the classical equiaxed one,due to the BOR in the lamellae,although both of them exhibited a volume diffusion character during ***,the similar superplasticity can be achieved for the base material and Nz after *** study can provide a new way to the spheroidization and a theoretical basis for the integral superplastic forming of welds during production.

关键词： Friction stir welding Titanium alloys Spheroidization mechanism Coalescence Superplasticity Static annealing

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Structure and Magnetic Properties of S-doped Mn_3O_4/S Composited Nanoparticles and Mn_3O_4 Nanoparticles

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Journal of Materials Science & Technology 2011年第6期27卷 503-506页

作者： X. He z.H. Wang d.Y. Geng z.d. zhang Shenyang National Laboratory for Materials Science Institute of Metal Research and International Centre for Materials Physics Chinese Academy of Sciences Shenyang 110016 China

Composited nanoparticles,consisting of Mn3O4,S-doped Mn3O4 and S,were synthesized by co-precipitation reaction and Mn3O4 nanoparticles were then obtained after removing the pure S from the composited *** Mn3O4-type phase with larger lattice constant a was formed by doping *** fixed temperatures below Curie temperature（TC）,the magnetization of the S-doped Mn3O4/S composited nanoparticles was smaller than that of the Mn3O4 *** blocking temperature was 36.3 and 34.8 K for Sdoped Mn3O4/S composite and Mn3O4 nanoparticles,*** anisotropy field of S-doped Mn3O4/S composite was determined to be about 55.3 kOe.

关键词： Nanostructured materials Chemical synthesis X-ray diffraction Magnetic measurements

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呼吸重症监护室肺部多重耐药菌的危险因素

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武汉大学学报（医学版） 2024年第1期45卷 99-103页

作者：木尼热·艾尼瓦尔倪岚程真顺吴长蓉南京医科大学附属克州人民医院新疆阿图什845350 武汉大学中南医院呼吸与危重症医学科湖北武汉430071

目的:回顾性研究呼吸重症监护室(RICU)住院患者肺部多重耐药菌(MdRO)感染的临床特点,进一步探讨RICU患者肺部多重耐药菌感染的危险因素。方法:选取2021年1月至2021年12月在武汉大学中南医院RICU收治的502例患者为研究对象,收集患者临床... 详细信息

目的:回顾性研究呼吸重症监护室(RICU)住院患者肺部多重耐药菌(MdRO)感染的临床特点,进一步探讨RICU患者肺部多重耐药菌感染的危险因素。方法:选取2021年1月至2021年12月在武汉大学中南医院RICU收治的502例患者为研究对象,收集患者临床资料,根据药敏试验结果分为多重耐药菌组(n=166)与非多重耐药菌组(n=336),采用SPSS 25.0系统分别行单因素和多因素分析RICU患者肺部多重耐药菌感染的危险因素。结果:502例患者中MdRO感染者166例。单因素分析显示,两组患者RICU住院时间>14 d、气切或气管插管、有创机械通气、中心静脉导管、使用3种及以上抗生素、多器官功能衰竭的差异均有统计学意义(P14 d及多器官功能衰竭是肺部MdRO感染的危险因素(P<0.05)。结论:RICU患者肺部多重耐药菌感染率很高,抗生素的合理使用、尽量减少有创操作及缩短RICU住院时间可能有利于减少多重耐药菌感染的发生率。

关键词：呼吸重症监护室多重耐药菌危险因素

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EFFECT OF AUSTEMPERIng ON TRANSFORMATION INdUCEd PLASTICITY OF HOT ROLLEd MULTIPHASE STEELS

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Acta Metallurgica Sinica(English Letters) 2007年第1期20卷 1-8页

作者： z. Li d. Wu The State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 China Shenyang Institute of Aeronautical Engineering Shenyang 110034 China

Effect of austempering on the transformation induced plasticity （TRIP） of hot rolled multiphase steel was investigated. Polygonal ferrite, granular bainite, and a large amount of stabilized retained austenite could be obtained in the hot rolled multiphase steel. Strain induced martensite transformation （SIMT） of retained austenite and TRIP effectively occur under straining owing to austempering after hot rolling, and mechanical properties of the present steel remain at a relatively high constant value for austempering at 400℃. The mechanical properties of the steel exhibited a good combination of tensile strength （791MPa） and total elongation （36%） because the stability of retained austenite is optimal when the steel is held for 20min.

关键词： austempering hot rolled multiphase steel mechanical property strain-induced transformation transformation-induced plasticity (TRIP)

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EFFECTS OF TEST TEMPERATURE ANd STRAIN RATE ON THE MECHANICAL PROPERTIES IN AN INTERCRITICALLYHEAT-TREATEd BAINITE-TRANSFORMEd STEEL

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Acta Metallurgica Sinica(English Letters) 2004年第6期17卷 840-848页

作者： z.Li d.Wu TheStateKeyLaboratoryofRollingandAutomation NortheasternUniversityShenyang110004China／／InstituteofAeronauticalEngineeringShenyangl10034China TheStateKeyLaboratoryofRollingandAutomation NortheasternUniversityShenyang110004China

Larger amount of austenite could be retained in an intercritically heat-treated bainite- transformed steel. The elongation and the strength-ductility balance of the steel could be enhanced considerably due to strain-induced martensite transformation and transformation- induced plasticity (TRIP) of retained austenite. The effects of test temperature and strain rate on the mechanical properties and strain induced transformation behavior of retained austenite in the steel were investigated. Total elongation and strength-ductility balance of the specimen reached maximum when it strained at a strain rate of 2.8×10-4s-1 and at 350℃. The relation between test temperature and tensile properties showed the same tendency at three kinds of strain rates. Flow stress increased considerably with decreasing the strain rate.

关键词： strain rate mechanical property strain-induced transformation trans- formation-induced plasticity (TRIP)

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Non-alcoholic fatty liver disease-related hepatocellular carcinoma:Is there a role for immunotherapy?

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World Journal of Gastroenterology 2022年第28期28卷 3595-3607页

作者： Ângelo z Mattos Jose d debes Arndt Vogel Marco Arrese Xavier Revelo Tales Henrique S Pase Muriel Manica Angelo A Mattos Graduate Program in Medicine:Hepatology Federal University of Health Sciences of Porto AlegrePorto Alegre 90050-170Brazil Gastroenterology and Hepatology Unit Irmandade Santa Casa de Misericórdia de Porto AlegrePorto Alegre 90050-170Brazil department of Medicine University of MinnesotaMinneapolisMN 55455United States department of Gastroenterology and Hepatology Erasmus Medical CenterRotterdam 999025Netherlands department of Gastroenterology Hepatology and EndocrinologyHannover Medical SchoolHannover 30625Germany department of Gastroenterology School of Medicine and Center for Aging and RegenerationFaculty of Biological SciencesPontificia Universidad Católica de ChileSantiago 3580000Chile department of Integrative Biology and Physiology University of MinnesotaMinneapolisMN 55455United States Internal Medicine Unit Irmandade Santa Casa de Misericórdia de Porto AlegrePorto Alegre 90020-090Brazil

Hepatocellular carcinoma(HCC)is among the most common cancers and it is a major cause of cancer-related ***-alcoholic fatty liver disease(NAFLd)affects approximately one fourth of individuals worldwide and it is becoming one of the most important causes of *** pathogenic mechanisms leading to NAFLd-related HCC are complex and not completely ***,metabolic,fibrogenic,oncogenic,inflammatory and immunological pathways seem to be ***-line therapy of advanced HCC has recently undergone major changes,since the combination of atezolizumab and bevacizumab was proven to increase survival when compared to *** immune-oncology drugs are also demonstrating promising results in patients with advanced HCC when compared to traditional systemic ***,initial studies raised concerns that the advantages of immunotherapy might depend on the underlying liver disease,which seems to be particularly important in NAFLd-related HCC,as these tumors might not benefit from *** article will review the mechanisms of NAFLd-related hepatocarcinogenesis,with an emphasis on its immune aspects,the efficacy of traditional systemic therapy for advanced NAFLd-related HCC,and the most recent data on the role of immunotherapy for this specific group of patients,showing that the management of this condition should be individualized and that a general recommendation cannot be made at this time.

关键词： Non-alcoholic fatty liver disease Hepatocellular carcinoma Hepatocarcinogenesis Immunology Immunotherapy Tyrosine kinase inhibitors

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Spherical Packing Superlattices in Self-Assembly of Homogenous Soft Matter:Progresses and Potentials

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Chinese Journal of Polymer Science 2023年第5期41卷 607-620,I0005页

作者： Yuchu Liu Huanyu Lei Qing-Yun Guo Xianyou Liu Xinghan Li Yuean Wu Weiyi Li Wei zhang Geng Xin Liu Xiao-Yun Yan Stephen z.d.Cheng South China Advanced Institute for Soft Matter Science and Technology School of Molecular Science and EngineeringSouth China University of TechnologyGuangzhou 510640China School of Polymer Science and Polymer Engineering The University of AkronAkron OH 44325-3909USA State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Center for Advanced Low-dimension MaterialsCollege of Material Science and EngineeringDonghua UniversityShanghai 201620China

The construction of complex superlattices using homogenous soft matter has great potential for the bottom-up fabrication of complex,nanoscale *** topic is not only interested in scientific exploring for new concepts of supramolecular crystals with nanometer in sizes,which is about thousand times larger in volumes than those of normal crystals,but also practically important to provide construction principles of metamaterials which are artificially structured materials for controlling and manipulating light,sound,and other physical *** systems have fast assembly kinetics and convenient processing procedures,making them ideal for large-scale superlattice *** this perspective,we focus on recent developments in the construction of complex spherical packing superlattices using homogenous soft *** discuss the general mechanism of those formations of supramolecular motifs and provide an overview of the spherical packing superlattices self-assembled by homogenous soft matters based on different volume ***,we outline the potentials of utilizing this approach in constructing novel superlattices as well as its future challenges.

关键词： Soft matter Self-assembly Spherical packing phases Superlattice Bottom-up construction

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Hybrid PIC–fluid simulations for fast electron transport in a silicon target

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Matter and Radiation at Extremes 2023年第3期8卷 18-26页

作者： X.H.Yang z.H.Chen H.Xu Y.Y.Ma G.B.zhang d.B.zou F.Q.Shao department of Nuclear Science and Technology National University of Defense TechnologyChangsha 410073China Collaborative Innovation Center of IFSA Shanghai Jiao Tong UniversityShanghai 200240China School of Computer Science National University of Defense TechnologyChangsha 410073China College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China department of Physics National University of Defense TechnologyChangsha 410073China

Ultra-intense laser-driven fast electron beam propagation in a silicon target is studied by three-dimensional hybrid particle-in-cell–fluid *** is found that the transverse spatial profile of the fast electron beam has a significant influence on the propagation of the fast *** the case of a steep spatial profile(e.g.,a super-Gaussian profile),a tight fast electron beam is produced,and this excites more intense resistive magnetic fields,which pinch the electron beam strongly,leading to strong filamentation of the *** contrast,as the gradient of the spatial profile becomes more gentle(e.g.,in the case of a Lorentzian profile),the resistive magnetic field and filamentation become *** indicates that fast electron propagation in a solid target can be controlled by modulating the spatial gradient of the laser pulse edge.

关键词： beam intense electron

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