Superplastic deformation behavior of Ti-4Al-2V alloy governed by its structure and precipitation phase evolution

Ratochka, I. V.; Лыкова, О. Н.; Мишин, И. П.; Naydenkin, E. V.

doi:10.1016/j.msea.2018.06.094

Cited by 21 publications

(9 citation statements)

References 25 publications

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“…The Ti-6Al-4V alloy, as an α/β titanium, has many mechanical properties, such as low density, high specific strength, and excellent corrosion resistance, which have been widely exploited in aerospace industries [1,2]. For the manufacture of parts with complex shapes, superplastic forming (SPF) is always applied due to large deformation resistance at room temperature [3,4]. Superplasticity refers to the property of materials that achieve great elongation without fracture.…”

Section: Introductionmentioning

confidence: 99%

Grain Rotation Accommodated GBS Mechanism for the Ti-6Al-4V Alloy during Superplastic Deformation

Yang

2021

Crystals

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An investigation of flow behavior and the deformation mechanism for Ti-6Al-4V alloy during the superplastic deformation process is presented in this paper. Constant strain rate tensile tests were performed at 890–950 °C and strain rates of 10−2, 10−3, and 10−4/s. Then, surface observation by Optical Microscope (OM), Scanning Electron Microscopy (SEM), and Electron Back-scattered Diffraction (EBSD) was applied to obtain the microstructure mechanism. With pole figure maps (PF) for α-phase, obvious texture gradually changed in the main deformation direction. For the titanium alloy, the evolution of texture in deformed samples was attributed to grain rotation (GR). Significant grain rearrangement occurred between grains after deformation. A complete grain rotation accommodated grain boundary sliding (GBS) deformation mechanism is proposed, which can explain texture evolution without grain deformation.

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Section: Introductionmentioning

confidence: 99%

Grain Rotation Accommodated GBS Mechanism for the Ti-6Al-4V Alloy during Superplastic Deformation

Yang

2021

Crystals

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“…Quantitative phase analysis carried out by the RIR method has shown that the mass fraction of the β-phase particles in the Ti5Al2V and Ti6Al4V alloys to be ~1.5% and about 5%, respectively. No XRD peaks corresponding to nucleation of other phases (e.g., α' or α"), which may nucleate in these alloys at high temperature plastic deformation [48,49], were observed. The unit cell parameters of α-Ti in the sintered specimens were close to the ones in the initial powders.…”

Section: Microstructure and Mechanical Properties Investigationmentioning

confidence: 89%

Investigation of Microstructure and Corrosion Resistance of Ti-Al-V Titanium Alloys Obtained by Spark Plasma Sintering

Нохрин

Андреев

Болдин

et al. 2021

Metals

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The research results of the microstructure and corrosion resistance of Ti and Ti-Al-V Russian industrial titanium alloys obtained by spark plasma sintering (SPS) are described. Investigations of the microstructure, phase composition, hardness, tensile strength, electrochemical corrosion resistance and hot salt corrosion of Ti-Al-V titanium alloy specimens were carried out. It was shown that the alloy specimens have a uniform highly dense microstructure and high hardness values. The studied alloys also have high resistance to electrochemical corrosion during tests in acidic aqueous solution causing the intergranular corrosion as well as high resistance to the hot salt corrosion. The assumption that the high hardness of the alloys as well as the differences in the corrosion resistance of the central and lateral parts of the specimens are due to the diffusion of carbon from the graphite mold into the specimen surface was suggested.

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“…As a consequence, in general, one can expect also the nucleation of the α2-phase nanoparticles and of the α''-phase ones during the diffusion welding of the Ti alloys by SPS. We think these particles to affect the corrosion resistance of the Ti alloy insufficiently since the sizes and volume fractions of these ones are small and, according to [72], these ones would affect the Ti alloy properties only indirectly affecting the α-Ti grain sizes.…”

Section: Discussionmentioning

confidence: 99%

Corrosion Resistance of the Welded Joints From the Ultrafine-Grained Near-α Titanium Alloys Ti-5Al-2V Obtained by Spark Plasma Sintering

Чувильдеев¹,

Нохрин²,

Likhnitskii³

et al. 2023

Preprint

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A diffusion welding of coarse-grained and ultrafine-grained (UFG) specimens of titanium near-α alloy Ti-5Al-2V used in nuclear power engineering was made by Spark Plasma Sintering. The failure of the welded specimens in the conditions of hot salt corrosion and of electrochemical corrosion were shown to have preferentially intercrystalline character. In the case of presence of macrodefects, crevice corrosion of the welded joints was observed. The resistance of the alloys against the intercrystalline corrosion was found to be determined by the concentration of vanadium at the titanium grain boundaries, by the size and volume fraction of the β-phase particles and by the presence of micro- and macropores in the welded joints. The specimens of the welded joints of the UFG alloy have higher hardness, hot salt corrosion resistance and the electrochemical corrosion.

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Superplastic deformation behavior of Ti-4Al-2V alloy governed by its structure and precipitation phase evolution

Cited by 21 publications

References 25 publications

Grain Rotation Accommodated GBS Mechanism for the Ti-6Al-4V Alloy during Superplastic Deformation

Grain Rotation Accommodated GBS Mechanism for the Ti-6Al-4V Alloy during Superplastic Deformation

Investigation of Microstructure and Corrosion Resistance of Ti-Al-V Titanium Alloys Obtained by Spark Plasma Sintering

Corrosion Resistance of the Welded Joints From the Ultrafine-Grained Near-α Titanium Alloys Ti-5Al-2V Obtained by Spark Plasma Sintering

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