Study of mechanical properties and corrosive resistance of ultrafine-grained α-titanium alloy Ti-5Al-2V

Чувильдеев, В. Н.; Копылов, В. И.; Нохрин, А. В.; Tryaev, P. V.; Козлова, Н. А.; Tabachkova, N. Yu.; Lopatin, Yu. G.; Ershova, A. V.; Mikhaylov, Andrey S.; Gryaznov, M. Yu.; Чегуров, М. К.

doi:10.1016/j.jallcom.2017.06.220

Cited by 46 publications

(20 citation statements)

References 37 publications

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“…2(c)-2(e), some parts of the formations and dendrites show the variable contrast from white to grey due to Z differences of phases, whereas the same regions can be discerned in opposite contrast in STEM-BF image that was governed by To explore the chemical contents of resulting phases after heat-treatment, energy filtering and EELS-based SI analyses were carried out (Figs. [3][4][5][6][7]. Due to the fact that joining and heat-treatment processes were conducted in air atmospheric conditions, Si 3 N 4 -Ti systems were comprised of just Si, N, and Ti elements, the major EELS L 2,3 (Si: 99 eV and Ti: 456 eV) and K (N: 401 eV and O: 532 eV) edges were used to view the corresponding elements in EFTEM 3-window analysis (Figs.…”

Section: Resultsmentioning

confidence: 99%

“…Conversely, for reactions (4-6,10,11), Ti 5 Si 3 phase formation was most favorable because of the negative value of free energy of formation, respectively (ΔG°1 400 ℃ = -140 kJ/mol, ΔG°1 400 ℃ = -56.19 kJ, ΔG°1 400 ℃ = -126.15 kJ, ΔG°1 400 ℃ = -127.49 kJ/mol, and ΔG°1 100 ℃ = −62.75 kJ/mol). On the other hand, TiN formation was likely to be occurred since ΔG o was negative for reactions (4,6,7,10,12) [18,36,37]. Regarding Ti 5 Si 3 and TiN , reaction (Eq.…”

Section: Discussionmentioning

confidence: 99%

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Unveiling the reaction products in heat treated Si3N4-Ti joined ceramics by transmission electron microscopy

2019

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Joining is a crucial process for the production of complex-shaped advanced engineering materials. Deep understanding of ceramic-metal interfaces during joining or following heat-treatment steps is therefore of important concern in designing the new systems. Capacitor discharge joining (CDJ) method was firstly carried out to compose the ceramic-metal joint material by silicon nitride (Si 3 N 4 )-titanium (Ti) constituents. Afterwards, heat treatment was performed on the Si 3 N 4 −Ti joints in air atmosphere at 1000 ℃ temperature to reveal the interface reactions and phases. Reaction layer that occurred between the Si 3 N 4 and Ti interfaces and new phase formations were examined by transmission electron microscopy (TEM)-based various imaging and chemical analysis techniques. Electron transparent samples for TEM characterization were prepared by focused ion beam (FIB) milling and lifting method. Based on the detailed TEM results, Si and N diffusion arising from the Si 3 N 4 ceramic was observed towards Ti metal foil side and further interacted with Ti atoms. The upshot of current diffusion was that Ti 3 N 2 reaction layer with 50 nm thickness was formed at the interface while titanium silicon nitride (Ti 6 Si 3 N) matrix phase including dendritic-shaped Ti 2 N grains occurred in the Ti interlayer. It is believed that our TEM-based microscopy results not only provide the knowledge on ceramic-metal joint materials by CDJ method, but also contribute new insights on the development of various new joint systems.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Unveiling the reaction products in heat treated Si3N4-Ti joined ceramics by transmission electron microscopy

2019

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“…Note that more uniform equiaxial microstructure was formed in the Ti5Al2V alloy than in the Ti6Al4V. The boundaries of the α-phase grains in the Ti6Al4V alloy had a lighter contrast in Z-contrast mode that evidences the nucleation of β-phase particles at the α-phase grain boundaries (Figures 2d and 3, see [39,46,47]). Similar "light" grain boundaries were found in the Ti5Al2V alloy as well although the volume fraction of these ones was lower than in the Ti6Al4V alloy considerably (Figure 3).…”

Section: Microstructure and Mechanical Properties Investigationmentioning

confidence: 94%

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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“…In recent years, severe plastic deformation(SPD) techniques such as equal channel angular pressing (ECAP), high pressure torsion (HPT), accumulative roll-bonding (ARB), cyclic extrusion–compression (CEC), multi-axial compressions/forgings (MAC/F), twist/screw extrusion (TE/SE) and repetitive corrugation straightening (RCS) have been used to obtain ultrafine grains in Ti alloys (Chuvil’deev et al , 2017; Zherebtsov et al , 2012).…”

Section: Development Of High Strength Near-α Titanium Alloysmentioning

confidence: 99%

“…Ultrafine grains with part-equiaxed nano-scale grains were obtained when a near- α Ti alloy was processed by ECAP at α / β transformation temperature followed by immediate quenching (Zhao et al , 2011). ECAP performed at elevated temperatures for Ti-5Al-2V alloy resulted in significant grain refinements and diffusive arrangements of corrosive impurities at the grain boundaries (Chuvil’deev et al , 2017). The resulting alloy had plasticity two to three times higher than the coarse-grained material.…”

Section: Development Of High Strength Near-α Titanium Alloysmentioning

confidence: 99%

Mechanical properties of near alpha titanium alloys for high-temperature applications - a review

Tabie

Wang

et al. 2020

AEAT

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Purpose This paper aims to present a broad review of near-a titanium alloys for high-temperature applications. Design/methodology/approach Following a brief introduction of titanium (Ti) alloys, this paper considers the near-α group of Ti alloys, which are the most popular high-temperature Ti alloys developed for a high-temperature application, particularly in compressor disc and blades in aero-engines. The paper is relied on literature within the past decade to discuss phase stability and microstructural effect of alloying elements, plastic deformation and reinforcements used in the development of these alloys. Findings The near-a Ti alloys show high potential for high-temperature applications, and many researchers have explored the incorporation of TiC, TiB SiC, Y2O3, La2O3 and Al2O3 reinforcements for improved mechanical properties. Rolling, extrusion, forging and some severe plastic deformation (SPD) techniques, as well as heat treatment methods, have also been explored extensively. There is, however, a paucity of information on SiC, Y2O3 and carbon nanotube reinforcements and their combinations for improved mechanical properties. Information on some SPD techniques such as cyclic extrusion compression, multiaxial compression/forging and repeated corrugation and straightening for this class of alloys is also limited. Originality/value This paper provides a topical, technical insight into developments in near-a Ti alloys using literature from within the past decade. It also outlines the future developments of this class of Ti alloys.

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Study of mechanical properties and corrosive resistance of ultrafine-grained α-titanium alloy Ti-5Al-2V

Cited by 46 publications

References 37 publications

Unveiling the reaction products in heat treated Si3N4-Ti joined ceramics by transmission electron microscopy

Unveiling the reaction products in heat treated Si3N4-Ti joined ceramics by transmission electron microscopy

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

Mechanical properties of near alpha titanium alloys for high-temperature applications - a review

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