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Hot deformation behavior and globularization mechanism of Ti-6Al-4V-0.1B alloy with lamellar microstructure

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Rare Metals 2013年第2期32卷 122-128页

作者： Yang Yu Bai-Qing Xiong Song-Xiao Hui wen-jun ye State Key Laboratory of Nonferrous Metals & Processes General Research Institute for Nonferrous Metals

Hot deformation behavior and globularization mechanism of Ti6A14V0.1B alloy with lamellar micro structure were quantitatively studied through isothermal compression tests with the temperature range of 850950 ℃and strain rate range of 0.011.00 s1. The results show that the peak flow stress and steady stress are sensitive to the strain rate and temperature. The value of deformation activation energy is 890.49 kJmo11 in （a＋β） region. Dynamic recrystallization is the major deformation mecha nism. Flow softening is dominated by dynamic recrystallization at 850950 ℃. TiB particles promote the recrystallization of laths. Globularization processes consist of four steps： for mation of subgrain after dynamic recovery in a plates; subgrain boundary migration caused by interracial instability; interfacial migration promoting phase wedge into a phase; disintegrating of a laths by diffusion processes; and grain boundary sliding. Globularization mechanisms during hot deformation processes of the Ti6A14V0.1B alloy with lamellar structure are continuous dynamic recrystallization.

关键词： Ti-6A1-4V-0.1B Hot deformation Lamellarmicrostructure Globularization mechanism

Microstructure and tensile properties of Ti-62421S alloy plate with different annealing treatments

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Rare Metals 2018年第7期37卷 568-573页

作者： Yong-Ling Wang Xiao-Yun Song wen Ma wen-Jing Zhang wen-jun ye Song-Xiao Hui State Key Laboratory of Nonferrous Metals and Processes General Research Institute for Nonferrous Metals Division of Science and Technology Information General Research Institute for Nonferrous Metals

Ti-62421S （Ti-6A1-2Sn-4Zr-2Nb-lMo-0.2Si） is a novel short-time using high-temperature titanium alloy. The effects of annealing on microstructure and tensile properties of Ti-62421S alloy plate were studied through optical microscopy （OM）, electron probe microanalysis （EPMA）, transmission electron microscopy （TEM）, and tensile tests. The results show that, with annealing tem- perature increasing, the volume fraction of primary α（αp）- phase decreases while that of transformed β（βt）-structure and secondary α （αs）-phase increases. The room-temperature strength and plasticity are insensitive to annealing temperature. However, with annealing temperature increasing, the tensile strength decreases at 550℃, while increases at 600 and 650℃ instead. It is suggested that, at 550℃, the strengthening mechanism is mainly boundary strengthening and the biggest contributor is ap-phase by providing αp/β-boundary area. Above 600 ℃, the strengthening mechanism is grain strengthening, where αs-phase strengthens the β-phase.

关键词： High temperature titanium alloy Ti-62421S Heat treatment Microstructure Tensile properties

Phase precipitation behavior and tensile property of a Ti-Al-Sn-Zr-Mo-Nb-W-Si titanium alloy

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Rare Metals 2018年第12期37卷 1064-1069页

作者： wen-Jing Zhang Xiao-Yun Song Song-Xiao Hui wen-jun ye Wei-Qi Wang State Key Laboratory for Fabrication and Processing of Nonferrous Metals General Research Institute for Nonferrous Metals School of Materials and Metallurgy Northeastern University Baoti Group Co. Ltd.

The characteristic of precipitation behavior of a2 phase and silicide, and the tensile properties at room temperature and 650℃after heat treatments in anovel TiAl-Sn-Zr-Mo-Nb-W-Si titanium alloy（BTi-6431 S） were investigated by microstructure analysis and mechanics performance testing. The results show that no second phase precipitates after solution treatment(980 ℃/2 h, air cooling（AC）). However, when the solution-treated specimens are aged at 600 ℃（600 ℃/2 h,AC）,α;phase precipitates in the primary α phase, and the size of α;phase increases with the aging temperature increasing to 750 ℃. Meanwhile, 50-100-nm S2-type silicide particles precipitate along lamellar phase boundaries of transformed β phase after aging at 750 ℃. BTi-6431 S alloy shows the best650 ℃ ultimate tensile strength（UTS） and yield strength（YS） when treated in solution treatment. However, aging treatment results in a decline in 650 ℃ ultimate tensile strength. This may be attributed to the loss of solution strengthening due to the depletion of Al, Si and Zr of the matrix caused by the precipitation of Ti;Al and（TiZr）;Si;.Silicide is a brittle phase; therefore, its precipitation causes a sharp decrease in the room-temperature ductility of BTi-6431 S alloy.

关键词： High-temperature titanium alloy Precipitation behavior α_2 phase Silicide Tensile properties

α_(2) phase precipitation behavior and tensile properties at room temperature and 650℃ in an(α+β) titanium alloy

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Rare Metals 2021年第11期40卷 3261-3268页

作者： wen-Jing Zhang Xiao-Yun Song Song-Xiao Hui wen-jun ye Yang Yu Yan-Feng Li State Key Laboratory of Nonferrous Metals and Processes GRIMAT Engineering Institute Co.Ltd.Beijing 100088China

The microstructure,room temperature and 650℃ tensile properties of an(α+β) titanium alloy were investigated after aging over a temperature range of 600-750℃ following solution *** results exhibit that both aging temperature and aging time influence the precipitation behavior of α_(2) phase,and the size ofα_(2) phase affects the tensile *** growth speed ofα_(2) phase gets quicker with the aging temperature increasing under the same aging *** a given aging temperature,the size of α_(2) phase gets larger when prolonging the aging *** are significant improvements in yield and ultimate tensile strength at room temperature and 650 ℃ after aging at 600℃ for 2 h,but these values decrease with the size of α_(2) phase *** is found that α_(2) phase,less than 7 nm,does not impair the roomtemperature ***,when the size of α_(2) phase grows up from 7 to 15 nm,ductility decreases *** 650 ℃ tensile process,with the particle size increasing from 3 to 15 nm,the interaction between moving dislocations and coherent particles changes from cutting mechanism to bypass mechanism.

关键词： Aging treatment α_(2)phase Tensile properties Interaction mechanism

Quasi-static and dynamic plastic deformation behavior in titanium with vanadium addition

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Rare Metals 2023年第7期42卷 2361-2370页

作者： Qiao-Chu Wang Song-Xiao Hui wen-jun ye Rui Liu Xiao-Yun Song State Key Laboratory for Fabrication&Processing of Nonferrous Metals General Research Institute for Nonferrous MetalsBeijing100088China

Compressive properties,microstructure features and deformation modes were investigated in binary Ti-(2,4,8)wt%V alloys during quasi-static(1×10^(-3)s^(-1))and dynamic(3×10^(3)s^(-1))*** compressive behavior shows a strong dependence on the loading strain rate and vanadium content contained in pure Ti,such that the flow stress increases with the increase in strain rate and vanadium content ranging from 2 wt%to 8 wt%.The microstructure features are clearly different from each other for alloys with different vanadium contents or under quasi-static and dynamic loading *** examination of deformation microstructures by optical microscopy and electron backscattered diffraction indicates that twinning behavior occurs during quasi-static and dynamic compressions and the twinning density increases with strain rate increasing but decreases with vanadium *** existence of{1012},{1121}and{1122}type twinning was further *** the help of the calculated Schmid factor map,the values of critical resolved shear stress of twinning types mentioned above have been obtained and verified to be rarely affected by the loading strain rate but sensitive to the vanadium *** vanadium-rich alloys(Ti-8V),twins are rarely observed but dislocation slip mechanism is active by transmission electron microscopy *** vanadium content increasing,both the critical resolved shear stress of twinning types and the content ofβphase with abundant slip systems increase,reflecting a suppression of twinning but an active dislocation slip mechanism.

关键词： Titanium alloys Strain rate Deformation mode Twinning Electron backscattered diffraction

High-temperature deformation behaviors of Ti-2Al-9.2Mo-2Fe alloy with boron

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Rare Metals 2023年第5期42卷 1695-1705页

作者： Rong Chen Song-Xiao Hui wen-jun ye Yang Yu Xu-jun Mi Dong-Geun Lee Yong-Tai Lee State Key Laboratory for Nonferrous Metal and Processing General Research Institute for Nonferrous MetalsBeijing100088China Department of Materials Metallurgical Engineering Sunchon National UniversitySunchon57922Korea Department of Nano New Materials Kyungnam UniversityChangwon51767Korea

Hot deformation behaviors of Ti-2Al-9.2Mo-2Fe alloy with boron were investigated in a hot compression test at temperatures ranging from 850 to 1000℃and strain rates ranging from 0.01 to 10.00 s^(-1).With strain rate decreasing and deformation temperature increasing,dynamic recrystallization(DRX)was promoted in both *** nucleation mechanism of DRX involved grain boundary bulging and subgrain *** case of deformation at low temperatures and high strain rates,the boronfree alloy only showed dynamic recovery(DRV)***,due to the particle-stimulated nucleation mechanism of recrystallization by TiB particles,the boron-containing alloy shows DRX at that *** DRX grain nuclei are formed by lattice rotation and subgrain growth from deformation zone in the initial grains,which are close to those of TiB ***,the flow stress of the boron-containing alloy is lower than that of the boron-free alloy due to the grain refinement during hot deformation process.

关键词： Newβtitanium alloy Boron addition Hot deformation Particle-stimulated nucleation Dynamic recrystallization

Dynamic response and plastic deformation behavior of Ti–5Al–2.5Sn ELI and Ti–8Al–1Mo–1V alloys under high-strain rate

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Rare Metals 2014年第2期33卷 127-133页

作者： Yan-Ling Wang Song-Xiao Hui Rui Liu wen-jun ye Yang Yu Ravil Kayumov State Key Laboratory for Fabrication & Processing of Nonferrous Metals General Research Institute for Nonferrous Metals Department of Mechanical Engineering Sun Moon University

Split Hopkinson pressure bar test system was used to investigate the plastic deformation behavior and dynamic response character of a-type Ti–5Al–2.5Sn ELI and near a-type Ti–8Al–1Mo–1V titanium alloy when subjected to dynamic loading. In the present work, stress–strain curves at strain rate from 1.5 9 103to 5.0 9 103s-1were analyzed, and optical microscope（OM） was used to reveal adiabatic shearing behavior of recovered samples. Results show that both the two alloys manifest significant strain hardening effects. Critical damage strain rate of the two alloys is about 4.3 9 103s-1, under which the impact absorbs energy of Ti–5Al–2.5Sn ELI and Ti–8Al–1Mo–1V are 560 and 470 MJ m-3, respectively. Both of them fracture along the maximum shearing strength orientation, an angle of 45° to the compression axis. No adiabatic shear band（ASB） is found in Ti–5Al–2.5Sn ELI alloy, whereas several ASBs with different widths exist without regular direction in Ti–8Al–1Mo–1V alloy.

关键词： Titanium alloy Ti–5Al–2.5Sn ELI Ti–8Al– 1Mo–1V High-strain rate Adiabatic shear band

Tracking in vivo migration and distribution of antigen-specific cytotoxic T lymphocytes by 5,6-carboxyfluorescein diacetate succinimidyl ester staining during cancer immunotherapy

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Chinese Medical Journal 2013年第16期126卷 3019-3025页

作者： XU Wei-li LI Suo-lin wen Ming wen jun-ye HAN Jie ZHANG Hong-zhen GAO Fei CAI Jian-hui Department of Pediatric Surgery the Second Hospital of HebeiMedical University Shijiazhuang Hebei 050000 China Department of Surgical Oncology the Affiliated Hospital of HebeiUniversity Baoding Hebei 071000 China Department of Oncology & Immunotherapy of Hebei GeneralHospital Shijiazhuang Hebei 050051 China

Background Killing of targeted tumors during adoptive cell transfer therapy is associated with cytotoxic T lymphocyte （CTL） numbers,immunophenotype,tumor-specificity,and in vivo residence time,migration,and ***,tracing in vivo persistence,migration,and distribution of CTLs is important for cancer *** Optimal staining concentration for CTL proliferation was determined by cell counting kit-8 （CCK-8） assay and killing efficiencies of CTLs or carboxyfluorescein diacetate succinimidyl ester （CFSE）-labeled melanoma antigen-specific cytotoxic T lymphocytes （CFSE-CTLs） for malignant melanoma cells in vitro were ***,CFSE-CTLs were intravenously transfused to mice receiving B16 melanoma,and their residence time,migration,and distribution in vivo were observed by measuring fluorescence intensities of CFSE-CTLs per gram of tissue （％FI/g） in various tissues and analyzing tumor/non-tumor （T/NT） ***-tumor effects of transferred CTLs and correlation between ％FI/g and D-value of tumor size were *** Five-micromolar CFSE was optimal for labeling CTLs with minimal *** significant difference occurred between CTLs and CFSE-CTLs for tumor cell killing （P=0.849） or interleukin-2 （P=0.318） and interferon-y （P=0.201）*** of CTLs in vivo varied with time.A negative correlation between ％FI/g in tumors and D-value of tumor sizes by Spearman correlation analysis was *** were recruited to and killed tumors from 6 hours to 3 days after cell *** were observed up to three weeks later in the tumor,liver,kidneys,and spleen; this was related to the abundant blood supply or the nature of immune *** CCK-8 assay is a novel method to select optimal CFSE staining *** intensity of transferred CTLs reflects their killing efficiency of *** fluorescent markers can trace in vivo CTL persistence,migration,and distribution because of its stability

关键词： cytotoxic T lymphocyte migration and distribution carboxyfluorescein diacetate succinimidyl ester adoptive cell transfer melanoma

Dynamic stress–strain properties of Ti–Al–V titanium alloys with various element contents

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Rare Metals 2013年第6期32卷 555-559页

作者： Rui Liu Song-Xiao Hui wen-jun ye Cheng-Lin Li Yan-Yan Fu Yang Yu Xiao-Yun Song State Key Laboratory of Nonferrous Metals General Research Institute for Nonferrous Metals

A series of Ti–Al–V titanium alloy bars with nominal composition Ti–7Al–5V ELI,Ti–5Al–3V ELI,commercial Ti–6Al–4V ELI and commercial Ti–6Al–4V were *** alloys were then heat treated to obtain bimodal or equiaxed microstructures with various contents of primary a *** compression properties of the alloys above were studied by split Hopkinson pressure bar system at strain rates from 2,000 to 4,000 *** results show that Ti–6Al–4V alloy with equiaxed primary a(ap)volume fraction of 45 vol%or 67 vol%exhibits good dynamic properties with high dynamic strength and absorbed energy,as well as an acceptable dynamic ***,all the Ti53ELI specimens and Ti64ELI specimens with ap of 65 vol%were not fractured at a strain rate of4,000 *** appears that the undamaged specimens still have load-bearing *** strength of Ti–Al–V alloy can be improved as the contents of elements Al,V,Fe,and O increase,while dynamic strain is not sensitive to the composition in the appropriate *** effects of primary alpha volume fraction on the dynamic properties are dependent on the compositions of Ti–Al–V alloys.

关键词： Dynamic properties Alloying content Microstructure Titanium alloy