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Effect of strain rate and temperature on the deformation behavior in a Ti-23.1Nb-2.0Zr-1.0O titanium alloy

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Journal of Materials Science & Technology 2021年第14期73卷 52-60页

作者： Yi Yang Di Xu Sheng Cao Songquan Wu Zhengwang Zhu Hao Wang Lei Li Shewei Xin Lei Qu Aijun Huang School of Materials Science and Engineering University of Shanghai for Science and TechnologyShanghai 200093China Department of Materials University of ManchesterOxford RoadManchester M139PLUK Institute of Metal Research Chinese Academy of SciencesShenyang 110016China Northwest Institute for Non-ferrous Metal Research Xi'an 710016China Department of Materials Science and Engineering Monash UniversityClayton.VIC 3800Australia

The compression behavior of a Ti-23.1 Nb-2.0 Zr-1.00(at.%)alloy was investigated at strain rates from 0.1 s_(-1) to 1000 s_(-1) and temperatures from 100℃to 200℃on a Gleeble 3800 system and Split Hopkinson Pressure Bar(SHPB)compressive *** microscopy,electron backscatter diffraction(EBSD),Xray diffraction(XRD)and transmission electron microscopy(TEM)were employed to characterize the microstructure evolution during the *** deformation phenomena,including dislocation slip,twinning of both{332}{113)and{112}{111}modes,stress-inducedα"martensite(SIMα")and stress-inducedω(SIω)transformations,were *** preferred activation of twinning and SIωtransfo rmations was observed in the sample compressed at lower temperatures and/or higher strain *** underlying mechanism is that twinning and stress induced phase transfo rmations are attribute to higher stress concentrations atβgrain boundaries and additional energy supplied by a higher strain rate,as well as high stacking fault energy because of higher temperature.

关键词： titanium alloy Plastic deformation Strain rate Temperature Microstructure

Fatigue crack tip plastic zone ofα+βtitanium alloy with Widmanstatten microstructure

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Journal of Materials Science & Technology 2018年第11期34卷 2107-2115页

作者： Yingjie Ma Sabry S.Youssef Xin Feng Hao Wang Sensen Huang Jianke Qiu Jiafeng Lei Rui Yang Institute of Metal Research Chinese Academy of SciencesShenyang 110016China University of Science and Technology of China(USTC) Hefei 230026China Northeastern University Shenyang 110089China

The recent studies had focused on the fatigue crack propagation behaviors of α＋β titanium alloys with Widmanstatten microstructure. The fascinated interest of this type of microstructure is due to the superior fatigue crack propagation resistance and fracture toughness as compared to other microstructures,which was believed to be related to the fatigue crack tip plastic zone（CTPZ）. In this study, the plastic deformation in fatigue CTPZ of Ti-6 A1-4 V titanium alloy with Widmanstatten microstructure was characterized by scanning electron microscope（SEM） and electron backscatter diffraction（EBSD）. The results showed that large-scale slipping and deformation twinning were generated in fatigue CTPZ due to the crystallographic feature of the Widmanstatten microstructure. The activation of twinning was related to the rank of Schmid factor（SF） and the diversity of twin variants developing behaviors reflected the influence of SF rank. The sizes of CTPZ under different stress intensity factors（K） were examined by the white-light coherence method, and the results revealed that the range of the plastic zone is enlarged with the increasing K（or crack length）, while the plastic strain decreased rapidly with the increasing distance from the crack surface. The large-scale slipping and deformation twinning in Widmannstatten microstructure remarkably expanded the range of fatigue CTPZ, which would lead to the obvious larger size of the observed CTPZ than that of the theoretically calculated size.

关键词： titanium alloy Widmanstatten microstructure CTPZ Slip Deformation twinning

Experimental research on electrochemical machining of titanium alloy Ti60 for a blisk

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Chinese Journal of Aeronautics 2016年第1期29卷 274-282页

作者： Chen Xuezhen Xu Zhengyang Zhu Dong Fang Zhongdong Zhu Di College of Mechanical and Electrical Engineering Nanjing University of Aeronautics & Astronautics

Ti60 （Ti-5.6A1-4.8Sn2Zr-1Mo-0.35Si-0.7Nd） is a high-temperature titanium alloy that is now used for important components of aircraft engines. Electrochemical machining （ECM） is a promising technique that has several advantages, such as a high machining rate, and can be used on a wide range of difficult-to-process materials. In this paper, orthogonal experiments are conducted to investigate ECM of Ti60, with the aim of determining the influences of some electrochemical pro- cess parameters on the surface roughness. The most important parameter is found to be the frequency of the pulsed power supply. It is found that using suitably optimized parameters for ECM can greatly decrease the surface roughness ofa workpiece. A surface roughness of approximately 0.912 μm can be obtained with the following optimal parameters： NaC1 electrolyte concentration 13wt%, voltage 20 V, pulse frequency 0.4 kHz, duty cycle 0.3, temperature 23 ℃, and anode feed rate 0.5 mm/min. Furthermore, blisk blades have been successfully processed using these optimized parameters

关键词： Blisk Electrochemical machining(ECM) Surface roughness titanium alloy Ti60

Microstructures and mechanical properties of a new titanium alloy for surgical implant application

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International Journal of Minerals,Metallurgy and Materials 2010年第2期17卷 185-191页

作者： Jun Li Lian Zhou Zuo-chen Li School of Materials Engineering Shanghai University of Engineering Science Shanghai 201620 China Northwest Institute for Nonferrous Metal Research Xi＇an 710016 China

A new titanium alloy Ti12.5Zr2.5Nb2.5Ta（TZNT） for surgical implant application was synthesized and fully annealed at 700℃for 45 *** microstructure and the mechanical properties such as tensile properties and fatigue properties were *** results show that TZNT mainly consists of a lot of lamellaα-phase clusters with different orientations distributed in the originalβ-phase grain boundaries and a small amount ofβphases between the lamella a *** alloy exhibits better ductility,lower modulus of elasticity,and lower admission strain in comparison with Ti6A14V and Ti6A17Nb,indicating that it has better biomechanical compatibility with human *** fatigue limit of TZNT is 333 MPa,at which the specimen has not failed at 10^7 cycles.A large number of striations present in the stable fatigue crack propagation area,and many dimples in the fast fatigue crack propagation area are observed,indicating the ductile fracture of the new alloy.

关键词： titanium alloy surgical implant microstructure mechanical properties fatigue

Flow behavior and processing map for hot deformation of ATI425 titanium alloy

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Journal of Materials Science & Technology 2018年第4期34卷 679-688页

作者： Qinggang Meng Chunguang Bai Dongsheng Xu Institute of Metal Research Chinese Academy of Sciences

Flow behavior and processing map play important roles in the hot deformation process of titanium alloys. In this research, compression Gleeble tests have been carried out to investigate the stress-strain relationship at temperatures ranging from 700 to 1000 ℃ and strain rates ranging from 0.001 to 1 s-1 for ATI 425 titanium alloy. Arrhenius type constitutive equation was obtained to describe the compressive flow behavior with modification of additional deformation dead zone, friction model, temperature model and strain rate. The introduction of novel calculation method for α value in Arrhenius equation gives more accurate fitting than traditional one. Processing maps were drawn based on the distribution of dissipator co-content, and optimized deformation temperature and strain rate range obtained. It is proven to be accurate and effective through the experimental results. The microstructure analysis shows that more dynamic recrystallization can be achieved in the area with larger ηvalue on the processing map.

关键词： titanium alloy Flow stress Constitutive equation Processing map

Fatigue properties of titanium alloy custom short stems fabricated by electron beam melting

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Journal of Materials Science & Technology 2020年第17期52卷 180-188页

作者： Liao Wang Shujun Li Mengning Yan Yubo Cheng Wentao Hou Yiping Wang Songtao Ai Rui Yang Kerong Dai Shanghai Key Laboratory of Orthopaedic Implants Department of Orthopaedic SurgeryShanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghai Jiao Tong UniversityShanghai 200030China titanium alloy Laboratory Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Image Medraw Technology(Shanghai)Company Limited Shanghai 201100China

The fatigue properties of titanium alloy short-stems with four different lengths,manufactured by electron beam melting(EBM)technology,were investigated by in vitro test and finite element(FE)*** simulation results indicate that the maximum tensile stress concentrates at the lateral side of the stem *** magnitude of the concentrated tensile stress increases and the corresponding area of the axial section decreases with increasing of stem *** from fatigue tests demonstrate that fatigue cracks mainly initiate from the rough surface of the stem where the maximum tensile stress *** fatigue strength decreases with the increase of stem length,which is attributed to the higher stress concentration on the longer stem *** addition,it is found that post EBM treatment via hot isostatic processing(HIP)is able to enhance the fatigue properties of the stems,since the pores generated during EBM are mostly closed during *** work also demonstrates that the stress concentration on the stem surface can be effectively mitigated and the corresponding fatigue properties of the EBM-fabricated titanium alloy short stem can be considerably improved by optimizing the design in the stem length.

关键词： Custom short stem titanium alloy Electron beam melting Fatigue property

A novel biomedical titanium alloy with high antibacterial property and low elastic modulus

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Journal of Materials Science & Technology 2021年第22期81卷 13-25页

作者： Diangeng Cai Xiaotong Zhao Lei Yang Renxian Wang Gaowu Qin Da-fu Chen Erlin Zhang Key Laboratory for Anisotropy and Texture of Materials Education Ministry of ChinaSchool of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Research Center for Metallic Wires Northeastern UniversityShenyang 110819China Laboratory of Bone Tissue Engineering Beijing Laboratory of Biomedical MaterialsBeijing Research Institute of Orthopaedics and TraumatologyBeijing Jishuitan HospitalBeijing 100035China

β-type titanium alloys have attracted much attention as implant materials because of their low elastic modulus and high strength,which is closer to human bones and can avoid the problem of stress fielding and extend the lifetime of ***,other issues,such as the infection or inflammation postimplantation,still trouble the titanium alloy's clinical *** this paper,we developed a novel nearβ-titanium alloy(Ti-13Nb-13Zr-13Ag,TNZA)with low elastic modulus and strong antibacterial ability by the addition of Ag element followed by proper microstructure controlling,which could reduce the stress shielding and bacterial infections *** microstructure,mechanical properties,corrosion resistance,antibacterial properties and cell toxicity were studied using SEM,electrochemical testing,mechanical test and cell *** results have demonstrated that TNZA alloy exhibited an elastic modulus of 75-87 GPa and a strong antibacterial ability(up to 98%reduction)and good ***,it was also shown that this alloy's corrosion resistance was better than that of *** the results suggested that Ti-13Nb-13Zr-13Ag might be a competitive biomedical titanium alloy.

关键词： Low Young’s modulus Antibacterial property titanium alloy Compatibility Antibacterial titanium alloy

Corrosion Behaviors of Nitride Coatings on titanium alloy in NaCl-Induced Hot Corrosion

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Acta Metallurgica Sinica(English Letters) 2021年第10期34卷 1434-1446页

作者： Mingming Zhang Yipeng Feng Yahui Wang Yunsong Niu Li Xin Yongfeng Li Jianxiu Su Shenglong Zhu Fuhui Wang School of Mechanical and Electrical Engineering Henan Institute of Science and TechnologyXinxiang 453003China Corrosion and Protection Division Shenyang National Laboratory for Materials ScienceInstitute of Metal ResearchShenyang 110016China Corrosion and Protection Division Shenyang National Laboratory for Materials ScienceNortheastern UniversityShenyang 110819China

TiN and TiAlN coatings were deposited by arc ion plating on titanium alloys to study their hot corrosion resistance when they were exposed to NaCl at 600℃.The microstructure and corrosion behaviors of nitride coatings were studied using scanning electron microscope,X-ray diffraction,electro-probe microanalyzer and X-ray photoelectron *** results showed that nitride coatings with the different compositions and the ones with the same composition but different thicknesses presented different hot corrosion *** and thin TiAlN coatings showed poor corrosion *** internal oxidation attacked the alloy *** corrosion products were mainly consisted of non-protective TiO2 and sodium *** contrast,the thick TiAlN coating presented outstanding corrosion *** sodium salt,the corrosion products were composed of protective Al_(2)O_(3).The increasing thickness of TiAlN significantly enhanced the hot corrosion *** corrosion mechanisms of alloy,TiN and TiAlN coatings were discussed in detail.

关键词： titanium alloy Nitride Coating Hot corrosion resistance

Influence of multi-stage heat treatment on the microstructure and mechanical properties of TC21 titanium alloy

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International Journal of Minerals,Metallurgy and Materials 2021年第2期28卷 296-304页

作者： Wei Long Song Zhang Yi-long Liang Mei-gui Ou College of Materials and Metallurgy Guizhou UniversityGuiyang 550025China Key Laboratory for Materials Structure and Strength of Guizhou province Guizhou UniversityGuiyang 550025China National Local Joint Engineering Laboratory for High Performance Metal Structure Materials and Manufacturing Technology Guizhou UniversityGuiyang 550025China

Duplex-structured TC21 alloy samples were first solution-treated at a higher temperature in theα+βregion(940°C)with furnace cooling(FC),air cooling(AC),and water cooling(WC),followed by a second-stage solution treatment at a lower temperature in theα+βregion(900°C),and then finally aged at 590°*** effects of the morphology and quantity ofαphases on the structure and properties of the TC21 alloy after the different heat treatments were *** in-situ tensile deformation process and crack propagation behavior were observed using scanning electron microscopy(SEM).The quantity of equiaxedαphases as well as the thickness of lamellarαphases reduced,the tensile strength increased firstly and then decreased,the elongation decreased with the increasing cooling rate after the first-stage solution *** amount and size of lamellarαphases increased after the second-stage solution treatment because of sufficient diffusion of the alloying elements,thereby leading to increased tensile *** amount of dispersedαphases increased after the third-stage aging treatment owing to the increase in the nucleation rate,resulting in a noteworthy strengthening *** the third-stage aging treatment,the first-stage FC sample exhibited better mechanical properties because it contained more equiaxedαandβtrans phases than the first-stage AC and WC samples.

关键词： multi-stage heat treatment titanium alloy in-situ tension microstructure mechanical properties