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On the superplastic deformation mechanisms of near-αTNW700 titanium alloy

Journal of Materials Science & Technology 2022年第13期108卷 173-185页

作者： Lixia Ma Min Wan Weidong Li Jie Shao Xiaoning Han Jichun Zhang School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China AVIC Manufacturing Technology Institute Beijing 100024China

The new near-αTNW700 titanium alloy is a potential candidate material for high performance ultrasonic/hypersonic aircrafts,which is designed for short-term service at 700℃.This study systematically investigated the superplastic deformation microstructure evolution and mechanism of TNW700 alloy at different strain rates and true strains at 925℃.Results show that TNW700 alloy exhibits excellent superplastic behavior in a constant strain rate range of 0.0005-0.005 s^(-1) with elongation above 400%.The peak stress decreases with decreasing strain rate,which is related to the increase ofβ-phase volume fraction caused by the increase of thermal exposure time.In addition,significant strain hardening is observed in early-middle stage of superplastic deformation,and flow softening is followed in middle-late stage.To rationalize these complex flow behaviors,electron backscatter diffraction(EBSD)and high resolution transmission electron microscopy(HRTEM)were used to characterize the microstructure.Strain hardening is correlated to the synergistic effect ofβgrain growth,dislocation accumulation,silicide precipitate,and solid solution strengthening ofαphase.Continuous dynamic recrystallization(CDRX)induced the fragmentation of primaryαgrains in middle-late stage of superplastic deformation,and the refinement ofαgrains,the increase ofβphase volume fraction and dynamic dislocation recovery are main causes of high strain softening.In addition,EBSD and TEM observations confirmed texture randomization,fine equiaxed primaryαgrains and intragranular dislocation movement,indicating that grain boundary sliding(GBS)accommodated by dislocation sliding/climb is the dominant superplastic deformation mechanism of TNW700 alloy.

关键词： Near-αtitanium alloy superplastic deformation Strain hardening and flow softening Microstructure evolution deformation mechanisms

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Effect of superplastic deformation on the bonding property of 00Cr25Ni7Mo3N duplex stainless steel

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International Journal of Minerals,Metallurgy and Materials 2012年第4期19卷 317-321页

作者： Xiao-hui Chen Xue-ping Ren Hui Xu Jian-guo Tong Hai-yan Zhang School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Sinosteel Equipment ＆ Engineering Co. Ltd. Beijing 100080 China

The superplastic deformation diffusion bonding of 00Cr25Ni7Mo3N duplex stainless steel was performed on a hot simulator. The microstructure of the bonding interface was characterized by scanning electron microscopy （SEM） and electron backscatter diffraction （EBSD）. The mechanical properties of the specimen were investigated by a shear strength test. The results indicated that the shear strength was improved with the increase of superplastic deformation reduction. When the deformation reduction was up to 50%, the shear strength of the specimen achieved 417 Mpa, approaching to that of the base metal. In addtion, the superplastic diffusion bonding technique was not very sensitive to surface roughness levels. When the surface roughness of the bonding specimen surpassed 0.416 pan （level G2）, the shear strength achieved at least 381 MPa.

关键词： stainless steel superplastic deformation diffusion bonding surface roughness shear strength

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Simulation on Grain Boundary Sliding during superplastic deformation Using Molecular Dynamics Method

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Journal of Materials Science & Technology 2003年第2期19卷 177-179页

作者： JitaiNIU LihongHAN ChonghaoWOO TheNationalKeyLaboratoryofAdvancedWeldingProductionTechnology HarbinInstituteofTechnologyHarbin150001China (null)

Grain growth and grain boundary sliding are the two main superplastic deformation mechanisms. In the paper, simulation work is focused on the sliding of a S3 (111) symmetric twist coincidence grain boundary, a S13 (110) asymmetric tilt coincidence grain boundary, and a S3 (110) symmetric tilt coincidence grain boundary in Al, and the energies of grain boundary for each of equilibrium configurations are computed. An embedded atom method (EAM) potential was used to simulate the atomic interactions in a bicrystal containing more than 2000 atoms. At 0 K, the relationships between total potential energy and time steps for S3 (111) symmetric twist coincidence grain boundary and S3 (110) symmetric tilt coincidence grain boundary during sliding at 2 m/s represent the periodic characteristic. However, the relationship between total potential energy and time steps for S13 (110) asymmetric tilt coincidence grain boundary represents the damp surge characteristic. It is found that grain boundary sliding for S3 (110) symmetric tilt coincidence grain boundary is coupled with apparent grain boundary migration.

关键词： Aluminum Grain boundary sliding superplastic deformation MD simulation

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Effect of superplastic deformation on precipitation behavior of sigma phase in 3207 duplex stainless steel

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Progress in Natural Science:Materials International 2021年第2期31卷 334-340页

作者： Jingkun Li Xueping Ren Yanling Zhang Hongliang Hou Xiaodan Gao School of Materials Science and Engineering University of Science and Technology Beijing AVIC Manufacturing Technology Institute Institute for Advanced Materials and Technology University of Science and Technology Beijing

Owing to excellent strength, toughness and corrosion resistance, duplex stainless steels(DSS) are widely used in constructional and petrochemical applications. Sigma phase, which has detrimental impact on the properties, is readily precipitated during hot working of DSS. However, precipitation behavior of sigma phase during superplastic deformation, which is the most significant processing method of DSS, is still unclear. In the current study,the effect of superplastic deformation on the precipitation behavior of sigma phase was investigated in 3207 duplex stainless steel. The result shows that superplastic deformation could prevent sigma phase precipitation generally by increasing mobility of grain boundaries and decreasing misorientation of the sigma phase boundaries, resulting in some sigma phase precipitated on the twin boundaries. Most of the sigma phase precipitated on ferrite-austenite interface with misorientation of 20–25°, while it precipitated in ferrite or austenite with the misorientation of 40°–45°. The orientation relationship between sigma phase and matrix matched well in austenite and on the ferrite/austenite interfaces, while it showed a small misfit in ferrite. The prevention effect of the superplastic deformation on the sigma phase precipitation was beneficial to quasi stable deformation stage,resulting in longer elongation.

关键词： Duplex stainless steel superplastic deformation Sigma phase (σ) Precipitation mechanism Hardening effect

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GRAIN SHAPE EFFECT IN superplastic deformation

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Acta Metallurgica Sinica(English Letters) 1989年第7期2卷 61-67页

作者： CUI Jianzhong MA Longxiang Northeast University of Technology,Shenyang,China Department of Metals Forming,Northeast University of Technology,Shenyang,China

The method controlling grain shape in TMT processing and the effect of grain shape on char- acteristic parameters in superplastic deformation were discussed.The accommodation velocity of grahl boundary sliding,which is the dominant mechanism in superplastic deformation,and the contribution of each mechanism to the total strain,as influenced by grain shape,were ana- lyzed.Grain shape has been shown to be an essential structural factor for superplasticity.Then an analysis was made about the effect of grain shape on the region transition strain rate so that a new concept,critical aspect for superplasticity,was worked out.These predictions were compared with the measured results in an Al-Zn-Mg alloy.

关键词： superplastic deformation thermomechanical treatment(TMT) grain shape grain boundary sliding region transition

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FRACTAL DIMENSION OF SHAPE CHANGE OF CAVITIFS DURING superplastic deformation IN HIGH STRENGTH Al ALLOY

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Acta Metallurgica Sinica(English Letters) 1991年第7期4卷 55-58页

作者： JIANG Xinggang CUI Jianzhong MA Longxiang

The fractal dimension changes of cavities have been determined during superplastic deformation of the high strength aluminiurn alloy 7475 with different strain,temperature, strain rate and grain size.The fractal dimension of cavities may increase with the increase of strain.It becomes higher as the alloy deformed under lower temperatures,greater strain rate and coarser grain size.The alloy would be approaching to rupture if the fractal dimension of cavities raised to a certain extent.

关键词： fractal dimension superplastic deformation cavity Al alloy

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Microstructural Effects in superplastic deformation

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上海金属.有色分册 1993年第4期 1-16页

作者： Zhou Shanyou (Shanghai Jiao Tong University,Shanghai 200030,P.R.China)

TheresultsofrecentChineseinvestigationsonmicrostructuralaspectsofsuperplasticdeformationarereviewed.Attentionisgiventograingro-wth,precipitate-freezoneformation,grainboundaryslidingandmigration,anddislocation(bothintragranulardislocationandgrainboundarydisloca-tion)activity.Inthefinalpartofthearticle,anewmodelofmicrograinsuperplasticdeformationbasedonthemovementofgrainboundarydisloca-tionsandinvolvingbothgrainboundaryslidinganddiffusionisdescribed.Thepredictionsofthemodelarecomparedwiththedataexperimentallydetermined.

关键词： superplastic deformation Microstructural effect Grainboundary sliding Dislocation activity

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Evolution of Microstructure and Texture during Hot deformation of a Commercially Processed Supral100

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Journal of Materials Science & Technology 2012年第6期28卷 531-536页

作者： V. Huang BCAST Brunel University Kingston Lane Uxbridge UB8 3PH UK

The microstructure and texture in a commercially processed AI-6 wt% Cu-0.4 wt% Zr （Suprall00） aluminium alloy have been investigated after annealing and hot tensile straining at 450℃, using a field emission gun scanning electron microscope （SEM） and electron backscatter diffraction （EBSD）. The microstructure of commercially processed alloy had a relatively large fraction of high angle grain boundaries （HAGBs） which were aligned parallel to the rolling direction, and a strong texture. Annealing at 450℃ led to an increase in the fraction of HAGBs and to an increase in HAGB spacing and these changes were progressively enhanced by subsequent tensile deformation. The increasing fraction of HAGBs was due to the annihilation of low angle grain boundaries （LAGBs）. A sharpening of texture during annealing was attributed to preferential textural growth, and the reduction of texture at higher tensile strains led to the development of superplastic behaviour. The present work supports the view that the evolution of the fine grain microstructure during the high temperature straining of SuprallO0 is primarily due to the accumulation of a large area of grain boundary during the initial thermomechanical processing, and does not involve any unusual restoration processes.

关键词： Aluminium superplastic deformation Microstructure Texture Electronbackscatter diffraction

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superplastic behavior of an ultrafine-grained Mg-13Zn-1.55Y alloy with a high volume fraction of icosahedral phases prepared by high-ratio differential speed rolling

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Journal of Materials Science & Technology 2017年第9期33卷 919-925页

作者： T.Y.Kwak W.J.Kim Rare Metal R&BD Group Korea Institute of Industrial Technology Department of Materials Science and Engineering Hongik University

An ultrafine-grained（UFG） Mg-13Zn-1.55 Y alloy（ZW132） with a high volume fraction（7.4%） of icosahedral phase（I-phase, Mg;Zn;Y） particles was prepared by applying high-ratio differential speed rolling（HRDSR） on the cast microstructure following homogenization. The alloy exhibited excellent superplasticity at low temperatures(tensile elongations of 455% and 1021% 473 K-10;s;and 523 K-10;s;,respectively). Compared with UFG Mg-9.25Zn-1.66 Y alloy（ZW92） with a lower volume fraction of I-phase particles（4.1%）, which was prepared using the same processing routes, the UFG ZW132 alloy exhibited a higher thermal stability of grain size. Rapid grain coarsening, however, occurred at temperatures beyond523 K, leading to a loss of superplasticity. The high-temperature deformation behavior of the HRDSRprocessed ZW132 alloy could be well described assuming that the mechanisms of grain boundary sliding and dislocation climb creep competed with each other and considering that the grain-size was largely increased by accelerated grain growth at the temperatures beyond 523 K.

关键词： Magnesium alloy superplastic deformation Ultrafine grain Icosahedral quasicrystal Grain growth

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deformation behavior of fine-grained 5083 Al alloy at elevated temperature

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Transactions of Nonferrous Metals Society of China 2009年第S2期19卷 307-311页

作者：张凯锋闫宏华 School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

The microstructure evolution of the fine-grained 5083 Al alloy was investigated in annealing temperature range of 150−300℃.Then the effects of the different annealed microstructures on high-temperature deformation behavior were further studied.The results indicate that the initial recrystallization temperature is about 200℃.By tensile tests at 380−570℃and in strain rate range of 4.17×10^(−4)−1.0×10^(−2) s^(−1),the optimum superplastic parameters are obtained as follows:the annealed temperature 250℃,the tensile temperature 550℃and the strain rate 4.17×10^(−4) s^(−1).With the aid of scanning electronic microscopy(SEM),the fractography of the alloy after the superplastic deformation was analyzed.The results reveal that intergranular cavities with fine size and homogeneous distribution are beneficial to superplastic deformation.

关键词： fine-grained 5083 Al alloy annealing superplastic deformation

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