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Heterogeneous precipitate microstructure in titanium alloys for simultaneous improvement of strength and ductility

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Journal of Materials Science & Technology 2022年第29期124卷 150-163页

作者： Mengyuan Hao Pei li Xuexiong li Tianlong zhang Dong Wang Qiaoyan Sun libin liu Jinshan li Yuyou Cui Rui yang Dongsheng Xu Frontier Institute of Science and Technology State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an 710049China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering Central South UniversityChangsha 410083China state key laboratory of solidification processing Northwestern Polytechnical UniversityXi’an 710072China Thermal Power Research Institute Co.Ltd. Xi’an 710032China

The design of alloys with simultaneous high strength and high ductility is still a difficult ***,we propose a new approach to designing multi-phase alloys with a synergistic combination of strength and ductility by engineering heterogeneous precipitate microstructures through the activation of different transformation *** a two-phase titanium alloy as an example,phase field simulations are carried out firstly to design heat treatment schedules that involve both conventional nucleation and growth and non-conventional pseudospinodal decomposition mechanisms,and the calculated microstructures have been evaluated by crystal plasticity finite element *** to simulations,we then set a two-step heat treatment to produce bimodalα+βmicrostructure in *** mechanical testing shows that the ductility of the alloy is increased by~50%and the strength is increased by~10%as compared to its unimodal *** work may provide a general way to improve the mechanical properties of alloys through multiscale microstructure design.

关键词： Titanium alloys Phase field simulation Crystal plasticity finite element Two-step aging Pseudospinodal decomposition mechanisms Multiscale heterogeneous microstructure

Orientation dependent behavior of tensile-creep deformation of hot rolled Ti65 titanium alloy sheet

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Journal of Materials Science & Technology 2021年第16期75卷 265-275页

作者： Zhixin zhang Jiangkun Fan Ruifeng li Hongchao Kou Zhiyong Chen Qingjiang Wang Hailong zhang Jian Wang Qi Gao Jinshan li state key laboratory of solidification processing Northwestern Polytechnical UniversityXi'an 710072China National Local Joint Engineering Research Center for Precision Thermoforming Technology of Advanced Metal Materials Xi'an 710072China Baoji Titanium Industry Co. Ltd.Baoji 721014China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China Baoti Group Co. Ltd.Baoji 721014China

The mill products like sheet always have one or more severe textures inevitably,and its effect on mechanical properties is not a negligible *** orientation dependent tensile-creep behavior induced by rolling texture of Ti65 titanium alloy sheet has been systematically investigated at 650℃.There are some anisotropic characteristics between TD and RD of Ti65 *** UTS and TYS of TD are higher than RD at 650℃.Besides,the creep endurance time of TD(172.6–174.5 h)is about three times longer than RD(55.6–65.1 h)at 650℃and 240 ***,the grains are inclined to form Texture III■after creep along with TD,but to form Texture I■after creep along with ***,the crack initiation site is different during creep in TD and *** reason for anisotropic properties of tensile and creep has been summarized in two aspects:(i)the change of the SFs(Schmid factors)value between TD and RD;(ii)the difference of creep mechanism between TD(grain boundary sliding)and RD(dislocation slip).Anisotropy of Ti65 sheet should be fully considered to increase structural efficiency in the engineering design and application.

关键词： Titanium alloy Texture Anisotropy Tensile Creep

Self-assembled thermosensitive luminescent nanoparticles with peptide-Au conjugates for cellular imaging and drug delivery

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Chinese Chemical Letters 2020年第3期31卷 859-864页

作者： xiaoyuan zhang wei liu Haixia Wang xinne Zhao Zhenfang zhang Gerd Ulrich Nienhaus li Shang Zhiqiang Su state key laboratory of Chemical Resource Engineering Beijing Key Laboratory of Advanced Functional Polymer CompositesBeijing University of Chemical TechnologyBeijing 100029China Faculty of Physics and Astronomy Friedrich Schiller University JenaJena 07743Germany Institute of Applied Physics Karlsruhe Institute of Technology(KIT)Karlsruhe 76128Germany Institute of Nanotechnology Karlsruhe Institute of Technology(KIT)Eggenstein-Leopoldshafen 76344Germany e Institute of Toxicology and Genetics Karlsruhe Institute of Technology(KIT)Eggenstein-Leopoldshafen 76344Germany Department of Physics University of Illinois at Urbana-ChampaignUrbanaIL 6J801 United States state key laboratory of solidification processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityShaanxi Joint Laboratory of Graphene(NPU)Xi'an 710072China

A facile and efficient strategy has been developed to fabricate a multifunctional,theranostic anticancer drug delivery platform featuring active targeting,controlled drug release and fluorescence imaging for real-time control of *** this end,thermo sensitive poly(N-isopropyl acrylamide)(PNIPAM)nanospheres are decorated with peptide-Au cluster conjugates as a smart nanomedicine platform.A sophisticated trifunctional peptide is designed to release the anticancer drug doxorubicin(DOX),target cells and reduce Au^3+ions to form luminescent Au cluste ***,the peptide-Au cluster moieties are attached to the PNIPAM nanospheres via amide bonds rather than noncovalent interactions,significantly improving their stability in biological medium and drug release *** in vitro experiments showed that DOX was released in an efficient and controlled manner under physiological conditions.

关键词： Peptide-Au bioconjugates PNIPAM nanoparticles Fluorescence Drug delivery Cell imaging

On the nature of a peculiar initial yield behavior in metastable β titanium alloy Ti-5Al-5Mo-5V-3Cr-0.5Fe with different initial microstructures

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Journal of Materials Science & Technology 2020年第3期38卷 135-147页

作者： Jiangkun Fan Zhixin zhang Puyi Gao Ruimeng yang Huan li Bin Tang Hongchao Kou Yudong zhang Claude Esling Jinshan li state key laboratory of solidification processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an710072China National&Local Joint Engineering Research Center for Precision Thermoforming Technology of Advanced Metal Materials Xi’an710072China School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an710129China Laboratoire d’étude des Microstructures et de Mécanique des Matériaux(LEM3) CNRS 7239Universitéde Lorraine57045MetzFrance laboratory of Excellence on Design of Alloy Metals for low-mAss Structures(DAMAS) Universitéde Lorraine57045MetzFrance

The compressive yielding phenomenon of titanium alloys is not as focused and sufficiently ascertain as the tensile yielding *** the present work,the peculiar compressive yielding behavior and the different dynamic responses of three different initial microstructures(singleβ,clavateβand lamellarβ)were investigated in an attractive metastableβtitanium alloy Ti-5553 using electron microscopes/crystallographic calculation/crystal plastic finite element *** reveal that the distinct compressive yielding behavior,steep peaks of sudden drop in the initial stage(very small true strain 0.03)of stress loading have appeared in the compression stress-strain curves except for the lamellarβinitial *** slip is the essential mechanism of the initial yielding *** multiple-slip bands formed in the singleβinitial microstructure during the warm deformation process.A small quantity of single slip bands was observed in the deformed clavateβinitial *** abundant varied nano/ultrafineβsprecipitates were nucleated dynamically and dispersedly in all the three deformed initial *** multiple-slip bands formation and substantial nanoscaleβsresult in the highest peak of flow stress for singleβinitial *** compressive slip bands are formed early in the elastic–plastic deformation *** the increasing strain,the sample showed a significant compressive bulge,or eventually forming a strong adiabatic shear band or *** results are expected to provide a reference for the study of deformation behavior and mechanical properties of metastableβtitanium alloys.

关键词： Titanium alloy Initial yield Deformation mechanism Slip band Phase transformation Ti-5553

Cryogenic wear behaviors of a metastable Ti-based bulk metallic glass composite

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Journal of Materials Science & Technology 2023年第3期134卷 33-41页

作者： Yue Ren Tingyi yan Zhuobin Huang Qing Zhou Ke Hua xiaolin li Yin Du Qian Jia Long zhang Haifeng zhang Haifeng Wang state key laboratory of solidification processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710072China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

Bulk metallic glass composites(BMGCs)are proven to be excellent candidates for cryogenic engineering applications due to their remarkable combination of strength,ductility and ***,few efforts have been done to estimate their wear behaviors that are closely correlated to their practical ***,we report an improvement of∼48%in wear resistance for a Ti-based BMGC at the cryogenic temperature of 113 K as compared to the case at 233 K.A pronounced martensitic transformation(β-Ti→α''-Ti)was found to coordinate deformation underneath the worn surface at 233 K but was significantly suppressed at 113 *** temperature-dependent structural evolution is clarified by artificially inducing a pre-notch by FIB cutting on aβ-Ti crystal,demonstrating a strain-dominated martensitic transformation in the *** improved wear resistance and suppressed martensitic transformation in BMGC at 113 K is associated with the increased strength and strong confinement of metallic glass on metastable crystalline phase at the cryogenic *** current work clarifies the superior cryogenic wear resistance of metastable BMGCs,making them excellent candidates for safety-critical wear applications at cryogenic temperatures.

关键词： Bulk metallic glass composites Martensitic transformation Cryogenic temperature Wear

Shear-Banding Evolution Dynamics during High Temperature Compression of Martensitic Ti-6Al-4V Alloy

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Chinese Physics Letters 2020年第11期37卷 55-59页

作者： Xue-Hua zhang Rong li Yong-Qing Zhao wei-Dong Zeng state key laboratory of solidification processing Northwestern Polytechnical UniversityXi'an 710072China Western Metal Materials Co. LTDXi'an 710021China Northwest Institute for Nonferrous Metal Research Xi'an 710016China

The isothermal compression dynamics of ternary Ti-6 Al-4 V alloy with initial martensitic structures were investigated in the high temperature range 1083-1173 K and moderate strain rate regime 0.01-10 *** banding was found to still dominate the deformation mechanism of this process,despite its nonadiabatic *** constitutive equation was derived with the aid of Zener-Hollomon parameter,which predicted the apparent activation energy as 534.39 kJ/mol.A combination of higher deformation temperature and lower strain rate suppressed the peak flow stress and promoted the evolution of shear *** experiments and calculations demonstrated that a conspicuous temperature rise up to 83 K could be induced by severe plastic *** facilitated the dynamic recrystallization of deformed martensites,as evidenced by the measured microhardness profiles across shear bands.

关键词： deformation martensite recrystallization

Influence of order-disorder transition on the mechanical andthermophysical properties of ABOhigh-entropy ceramicsInfluence of order-disorder transition on the mechanical and thermophysical properties of A_(2)B_(2)O_(7)high-entropy ceramics 1

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Journal of Advanced Ceramics 2022年第8期11卷 1222-1234页

作者： Jiatong ZHU Mingyue wei Jie XU Runwu yanG Xuanyu MENG Ping zhang Jinlong yanG Guangzhong li Feng GAO state key laboratory of solidification processing MIIT Key Laboratory of Radiation Detection Materials and DevicesSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China NPU–QMUL Joint Research Institute of Advanced Materials and Structure Northwestern Polytechnical UniversityXi’an 710072China state key laboratory of New Ceramics and Fine processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China state key laboratory of Porous Metal Materials Northwest Institute for Nonferrous Metal ResearchXi’an 710016China

The order–disorder transition(ODT)of A_(2)B_(2)O_(7)compounds obtained enormous attention owing to the potential application for thermal barrier coating(TBC)*** this work,the influence of ODT on the mechanical and thermophysical properties of dual-phase A_(2)B_(2)O_(7)high-entropy ceramics was investigated by substituting Ce^(4+)and Hf^(4+)with different ionic radii on B-sites(Zr^(4+)).The X-ray diffraction(XRD),Raman,and transmission electron microscopy(TEM)results show that rA3+/rB^(4+)=1.47 is the critical value of ODT phase boundary with different doping B-site ion contents,and the energy dispersive spectroscopy(EDS)results further indicate the uniform distribution of ***,owing to the high intrinsic disorder derived from high-entropy effect,the A_(2)B_(2)O_(7)high-entropy ceramics exhibit unreduced modulus(E0≈230 GPa)and enhanced mechanical properties(HV≈10 GPa,KIC≈2.3 MPa·m^(0.5)).A_(2)B_(2)O_(7)high-entropy ceramics exhibit excellent thermal stability with relatively high thermal expansion coefficients(TECs)(Hf_(0.25),11.20×10-6 K-1,1000℃).Moreover,the matching calculation implied that the ODT further enhances the phonon scattering coefficient,leading to a relatively lower thermal conductivity of(La_(0.25)Eu_(0.25)Gd_(0.25)Yb_(0.25))2(Zr_(0.85)Ce_(0.15))_(2)O_(7)(1.48–1.51 W/(m·K),100–500℃)compared with other *** present work provides a novel composition design principle for high-entropy ceramics,as well as a material selection rule for high-temperature insulation applications.

关键词： high-entropy ceramics A_(2)B_(2)O_(7) order-disorder transition(ODT) mechanical properties thermal conductivity

Temperature-dependent deformation in silver-particle-covered copper nanowires by molecular dynamics simulation

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Journal of Materiomics 2022年第1期8卷 68-78页

作者： Pengtao li Y.Q.yang Vladimir Koval xian Luo Jianxin Chen wei zhang E.Emily lin Bowen Wang Haixue yan state key laboratory of solidification processing Northwestern Polytechnical UniversityXi'an710072China Institute of Materials Research Slovak Academy of SciencesKosice04001Slovakia School of Chemistry and Chemical Engineering Northwestern Polytechnical UniversityXi'an71072China Northwest Institute for Nonferrous Metal Research Xi'an710016China School of Engineering&Material Science Queen Mary University of LondonMile End RoadE14NSLondonUnited Kingdom

Cu nanowires covered by Ag particles is studied for potential applications in the next-generation *** date,the deformation mechanism in the Cu-Ag core-particle is not ***,molecular dynamics simulation is used to describe the Cu-Ag core-particle *** results show that the equilibrium structure of Ag particles is reconstructed,when the particle≤1.0 *** low temperature(1 K)indicate that three different deformation processes take part in the core-particle structure,depending on the size of Ag *** the particle diameter≤2.0 nm,the prevailing deformation mechanism is the emission of dislocations from the Cu *** the particle diameters ranging from 3.0 to 6.0 nm,the emission of misfit dislocations from the Ag-Cu interface is the dominant deformation *** the Ag particle≥6.0 nm,the deformation mechanism can be characterized by the slip band,consisting of the dislocations and amorphous *** elevated temperatures(2-400 K),the mechanical properties of the Ag-Cu core-shell system are nearly independent of temperature,whereas the structure with particles larger than 2.0 nm showed a strong dependence of its mechanical properties on *** on the results,the diameter-temperature plastic deformation map is proposed.

关键词： Nanowires Deformation Cu-Ag Nano particle Dislocation

Uncertainty analysis and robust design optimization for the heat-assisted bending of high-strength titanium tube

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Science china(Technological Sciences) 2021年第10期64卷 2174-2185页

作者： zhang Zhao yanG JingChao HUANG weiliang MA Jun li Heng Taicang yangtze River Delta Research Institute Northwestern Polytechnical UniversityTaicang 215400China state key laboratory of solidification processing Northwestern Polytechnical UniversityXi’an 710072China

Heat-assisted rotary draw bending(HRDB)is a promising technique for manufacturing difficult-to-form tubular components comprising high-strength titanium tubes(HSTTs)with small bending ***,as a multidie constrained and thermomechanical coupled process with many uncertainty factors,a high risk of several defects,such as cross-section distortion,over wall thinning,or even cracking,is *** the robust design optimization(RDO)of complex forming processes remains a nontrivial and challenging scientific ***,considering a high-strength Ti-3Al-2.5V titanium alloy tube as a case material,the five significant uncertainty factors in HRDB,i.e.,temperature distribution,tube geometrical characteristics,tube material parameters,tube/tool friction,and boost velocity had been ***,considering the preheating and HRDB of HSTT,a whole-process thermomechanical three-dimensional finite element model was established and validated for virtual ***,considering the maximum section distortion Q and maximum wall-thickness thinning t as the optimization objectives and the mean and variance of material and forming parameters,an RDO model was ***,the Pareto optimal solutions were obtained using the nondominated sorting genetic algorithm II,and a minimum distance selection method was employed to obtain the satisfactory *** show that the optimized solutions considering the uncertainty factors reduce the maximum section distortion rate of HSTT after bending by 38.1%and the maximum wallthickness thinning rate by 27.8%.

关键词： robust design optimization uncertainty factors heat-assisted bending high-strength titanium tube