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Microstructure Characteristics and Elevated Temperature Mechanical Properties of a B Containedβ-solidifiedγ-tial alloy

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Journal of Wuhan University of Technology(Materials Science) 2024年第3期39卷 738-746页

作者：王秀琦 GUO Ruiqi 刘国怀 LI Tianrui YANG Yuxuan CHEN Yang XIN Meiling WANG Zhaodong State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China School of Materials Science and Engineering Harbin Institute of Technology at ShenzhenShenzhen 518055China School of Metallurgical Engineering Anhui University of TechnologyMaanshan 243000China

The improved microstructure and enhanced elevated temperature mechanical properties of Ti-44Al-5Nb-(Mo,V,B)alloys were obtained by vacuum arc re-melting(VAR)and primary annealing heat treatment(HT)of 1260℃/6 h/Furnace cooling(FC).The phase transformation,microstructure evolution and tensile properties for as-cast and HTed alloys were investigated.Results indicate that three main phase transformation points are determined,T_(eut)=1164.3℃,T_(γsolv)=1268.3℃and T_(βtrans)=1382.8℃.There are coarse lamellar colonies(300μm in length)and neighbor reticular B2 andγgrain(3-5μm)in as-cast alloy,while lamellar colonies are markedly refined and multi-oriented(20-50μm)as well as the volume fraction and grain sizes of equiaxedγand B2 phases(about 15μm)significantly increase in as-HTed alloy.Phase transformations involvingα+γ→α+γ+β/B2 and discontinuousγcoarsening contribute to the above characteristics.Borides(1-3μm)act as nucleation sites forβ_(eutectic) and produce massiveβgrains with different orientations,thus effectively refining the lamellar colonies and forming homogeneous multi-phase microstructure.Tensile curves show both the alloys exhibit suitable performance at 800℃.As-cast alloy shows a higher ultimate tensile stress of 647 MPa,while a better total elongation of more than 41%is obtained for as-HTed alloy.The mechanical properties improvement is mainly attributed to fine,multi-oriented lamellar colonies,coordinated deformation of homogeneous multi-phase microstructure and borides within lamellar interface preventing crack propagation.

关键词： tial alloy phase transformation heat treatment boride microstructure mechanical properties

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Precipitation of Ti 2 Al phases at lamellar interfaces in a high-Nb-containing tial alloy during thermal exposure

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Journal of Materials Science & Technology 2022年第31期126卷 132-140页

作者： Dongxu Li Guoying Zhang Gang Lu Yujie Liu Jianjun Wang Chunming Liu Key Laboratory for Anisotropy and Texture of Materials(MOE) School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China College of Physics Science and Technology Shenyang Normal UniversityShenyang 110034China Research Center for Metallic Wires Northeastern UniversityShenyang 110819China

The thermal stability of microstructures is crucial for determining the performance of alloys in extreme environments.In the present work,the microstructural evolution and precipitation behavior in a high Nb-containing Ti45Al8Nb alloy during thermal exposure at 950°C were investigated.It was found that excessα2 phases in the as-cast microstructure were unstable and tended to decompose during thermal expo-sure.Hexagonal Ti 2 Al phases precipitated at lamellar interfaces and had a[1¯10]_(γ)[11¯20]_(α2)[11¯20]_(Ti2Al),(002)_(γ)(1¯100)_(α2)(1¯100)_(Ti2Al)crystallographic orientation relationship(OR)with the matrix.Stacking faults(SFs)generated inα2 phases during theα2→γphase transformation provided favorable nucleation sites for Ti 2 Al phases.

关键词： tial alloy Thermal exposure Phase transformation Precipitation

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Twin and twin intersection phenomena in a creep deformed microalloyed directionally solidified high Nb containing tial alloy

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Journal of Materials Science & Technology 2022年第32期127卷 115-123页

作者： Xuesong Xu Hongsheng Ding Haitao Huang He Liang Hao Guo Ruirun Chen Jingjie Guo Hengzhi Fu National Key Laboratory for Precision Hot Processing of Metals School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China

The creep behavior of a directionally solidified tial alloy with a high Nb content after microalloying by the addition of small amounts of W,Cr,and B elements was investigated by scanning electron microscopy and transmission electron microscopy.By means of directional solidification and microalloying,a tial alloy with a fine and uniform microstructure and continuous columnar crystals was obtained.High-density dislocations,deformation nanotwins,and twin intersections were observed inγlamellae.The results show that,in comparison with the ternary tial alloy,the microalloyed high Nb containing tial alloy exhibited better creep properties at 760℃and 275 MPa.The decrease in stacking fault energy can promote dislocation dissociation and the formation of deformation twins,and the twin intersections can hinder the movement of dislocation to enhance the creep performance of the tial alloy.

关键词： tial alloy Directional solidification Deformation nanotwins Twin intersections Creep Stacking fault

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Fabrication and Characterization of tial alloy by Fields Activated Sintering Technology(FAST)

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Journal of Wuhan University of Technology(Materials Science) 2022年第3期37卷 470-474页

作者：周黎明吴明霞 QIN Yuan YANG Gang YANG Yi School of Mechanical Engineering Chengdu UniversityChengdu 610106China School of Mechanical Engineering Sichuan UniversityChengdu 610065China

Ti-47Al alloy was fabricated by multi-physical fields activated sintering technology(FAST).With the coupling effects of electrical and pressure fields as the dominant driving force,a nearly fulldensity(relative density:99.15%)tial alloy sample was obtained.The microstructural characterizations,phase transformation at different sintering temperatures and their contributions to mechanical properties were investigated.The results reveal that tial_(3)is the main phase when sintered at 600 and 700℃.When the sintering temperature reaches 800℃,the main phases are tial and Ti_(3)Al.With the increase of sintering temperature,the content of tial increases and that of Ti_(3)Al decreases.When the sintering temperature reaches 1000℃,the alloy with fine and uniform microstructure and good mechanical properties can be obtained.

关键词： tial alloy Micro-FAST Microstructure Mechanical properties

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Manufacturing a tial alloy by high-energy ball milling and subsequent reactive sintering

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Rare Metals 2006年第1期25卷 21-26页

作者： QU Shengguan LI Xiaoqiang LI Yuanyuan HU Lianxi WANG Erde College of Mechanical Engineering South China University of Technology Guangzhou 510640 China College of Materials Science ＆ Engineering Harbin Institute of Technology Harbin 150001 China

A tial alloy was fabricated by high-energy ball milling and subsequent reactive sintering from the mixed powders of Ti and Al. High-energy ball milling produced a kind of particular composite powders with an extremely fine altemative Ti and Al lamella structure. The composite powders not only possessed good consolidation and densification characteristics, but also resulted in the augment of nucleation rate of α and γ titanium aluminides during solid-phase reactive sintering After a series of processing, pressing, degassing, extrusion, and sintering, the resultant tial alloy presented high relative density and refined grain sizes of （α2 ＋ γ） lamella and γ phases. The compressive yield strength of the sintered tial reached 600 MPa at 800℃.

关键词： tial alloy high-energy ball milling reactive sintering

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Microstructure and high-temperature tensile property of tial alloy produced by selective electron beam melting

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Rare Metals 2021年第12期40卷 3635-3644页

作者： Hang-Yu Yue Hui Peng Yong-Jun Su Xiao-Peng Wang Yu-Yong Chen School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Key Laboratory of High-Temperature Structural Materials and Coatings Technology Ministry of Industry and Information TechnologyBeihang UniversityBeijing 100191China School of Materials Science and Engineering Beihang UniversityBeijing 100191China Department of Mechanics College of EngineeringLishui UniversityLishui 323000China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

The microstructure and high-temperature tensile property of a Ti-47Al-2Cr-2 Nb alloy fabricated via selective electron beam melting(SEBM) with hatch spacings of 85,100,and 115 μm were systematically investigated.When the hatch spacing increased from 85 to 115 μm,the microstructure comprising the horizontal cross section changed from coarse lamellar(y/B2) colonies to an inhomogeneous structure and the grain morphology transformed from elongated grains to inhomogeneous and equiaxed grains along the building direction of the vertical cross section.The boundary population of the SEBMproduced tial alloy samples was dominated by high-angle grain boundaries(≥ 15°),and the volume fraction of these boundaries decreased with hatch spacing increasing.Additionally,the as-built tial alloy sample produced under a spacing of 100 μm exhibited the highest room-and elevated-temperature tensile strengths,with the ultimate tensile strength at room temperature(642 MPa) increasing to 674 MPa at 700 ℃.Furthermore,the mechanism of anomalous strengthening at 700 ℃ was discussed in detail.

关键词： Selective electron beam melting tial alloy Hatch spacing Microstructure Tensile property

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Determination of stacking fault energies in a high-Nb tial alloy at 298 K and 1273 K

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Journal of University of Science and Technology Beijing 2004年第1期11卷 35-38页

作者： XipingSong LinCao YanliWang JunpinLin GuoliangChen StateKeyLaboratoryforAdvancedMetalsandMaterials UniversityofScienceandTechnologyBeijingBeijing100083China ScienceandEngineeringSchool UniversityofScienceandTechnologyBeijingBeijing100083China

The stacking fault energies of Ti-46Al-8.5Nb-0.2W alloy at 298 K and 1273 Kwere determined. The principle for the determination of the stacking fault energies is based on thefact that the stacking fault energy and the elastic interaction energy acting on the dissociatedpartial dislocations are equal. After the compress deformations with the strain of 0.2% at 298 K and1273 K, and water quench to maintain the dislocation structures deformed at 1273 K, thedissociation distances between two partial dislocations were determined by weak beam transmissionelectron microscopy (WBTEM) technique. Based on these dissociation distances and the correspondingcalculation method, the stacking fault energies were determined to be 77-81 mJ/m^2 at 298 K and tobe 57-60mJ/m^2 at 1273 K respectively.

关键词： stacking fault energy tial alloy temperature dislocation

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Characterization of creep behavior of tial alloy with high Nb content at elevated temperatures

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Rare Metals 2016年第1期35卷 106-112页

作者： Cheng-Li Dong Hui-Chen Yu Ze-Hui Jiao Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Science and Technology on Advanced High Temperature Structural Materials LaboratoryBeijing Institute of Aeronautical Materials Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials

Creep experiments of the tial alloy with high Nb content were conducted to consider both the temperature dependence and stress dependence of its creep behavior.The creep curves were characterized by Theta constitutive model,and Newton-Gauss method was applied to obtain the material parameters.Based on the rupture strain,the rupture life of the tial alloy was able to be predicted by Theta constitutive model.The results show that the creep curves of the tial alloy contain primary creep,secondary creep and tertiary creep stages,especially for the lower stress.The rupture life of the tial alloy decreases with the increase in either applied stress or temperature.Theta constitutive model is able to describe the creep deformation of the tial alloy accurately,and the predicted life agrees well with the experimental result.

关键词： tial alloy Creep Rupture Life prediction Theta constitutive model

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Effects of Joining Conditions on Microstructure and Mechanical Properties of C_f/Al Composites and tial alloy Combustion Synthesis Joints

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Acta Metallurgica Sinica(English Letters) 2015年第4期28卷 405-413页

作者： Guang-Jie Feng Zhuo-Ran Li Rui-Hua Liu Shi-Cheng Feng State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology

Cf/Al composites and tial alloy were joined by combustion synthesis in different joining conditions. Effects of additive Cu, joining temperature and holding time on joint microstructure and shear strength were characterized by employing DTA, SEM, EDS, XRD and shear test. Results show that the additive Cu in the Ti-Al-C interlayer could significantly decrease the reaction temperature owing to the emergence of Al--Cu eutectic liquid. Reaction degree of the interlayer was influenced by joining temperature and holding time. Due to the barrier action of formed tial3 layer, reaction rate of Ti and Al was determined by the atoms diffusion. The reaction between Ti and AI was more sensitive to the joining temperature rather the holding time. The joints shear strength was influenced by joining condition directly. The maximum shear strength of CS joints was 25.89 MPa at 600 ℃ for 30 rain under 5 MPa. Interface evolution mechanism of the CS joint was analyzed based on the experimental results and phase diagram.

关键词： C/Al composite tial alloy Combustion synthesis Interface microstructure Formationmechanism

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Experimental investigation of laser peening on tial alloy microstructure and properties

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Chinese Journal of Aeronautics 2015年第2期28卷 609-616页

作者： Qiao Hongchao Zhao Jibin Gao Yu Shenyang Institute of Automation Chinese Academy of Science AVIC Shenyang Liming Aero-engine (Group) Corporation Ltd.

In order to study the effect of laser peening on microstructures and properties of tial alloy, TiAI alloy samples were treated by Nd：YAG laser system with the wavelength of 1064 nm, pulse-width of 18 ns, and pulse-energy of 0-10J. Surface micro-hardness, roughness, and microstructural characteristics were tested with micro-hardness tester, roughness tester and scanning electron microscope. Residual stress and pole figures were tested with X-ray diffraction and its high-temperature stability was analyzed. The experimental results show that surface micro-hardness increases by up to 30%, roughness increases to 0.37 lain, compressive residual stress increases to 337 MPa, and local texture and typical lamellar microstructure are generated. Residual stress, micro-hardness, and （002） pole figures tests are conducted, compressive residual stress value drops from 337 MPa to 260 MPa, hardness value drops from 377 HV0.2 to 343 HV0.2, and the （002） poles shift back to the center slightly. Laser peening improves microstructure and properties of tial alloy significantly.

关键词： High temperature stabilityLaser peening Microstructure Residual stress tial alloy

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