Influence of high-temperature annealing on structure of titanium aluminide materials obtained by combustion and high-temperature shear deformation

Bazhina, Arina; Бажин, П. М.; Чижиков, А. П.; Konstantinov, A. S.; Столин, А. М.

doi:10.1016/j.intermet.2021.107313

Cited by 7 publications

(6 citation statements)

References 17 publications

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“…Thus, under conditions of free SHS compression, by changing the composition of the green sample and the synthesis time until contact with the press plunger, it is possible to change the phase composition and structure in intermetallic materials. As shown in the study [55], subsequent thermal annealing makes it possible to homogenize the synthesized materials based on Ti-Al. It was found [36] that, at temperatures above 527 • C, the deformation mechanism changes in the two-phase nano-polycrystalline alloy TiAl + Ti 3 Al.…”

Section: X-ray Powder Diffraction and Microstructurementioning

confidence: 99%

Relationship between Structure and Properties of Intermetallic Materials Based on γ-TiAl Hardened In Situ with Ti3Al

Авдеева

Bazhina

Antipov

et al. 2023

Metals

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In this work, intermetallic materials based on γ-TiAl in situ strengthened with the Ti3Al phase have been obtained from the initial components of titanium and aluminum under the conditions of free SHS-compression in one technological step and in ten seconds. This method combines the process of the combustion of initial components in the mode of self-propagating high-temperature synthesis (SHS) with high-temperature shear deformation of the synthesized materials. The following initial compositions have been studied (mol): Ti–Al, 1.5 Ti–Al, and 3 Ti–Al. Thermodynamic calculations have been carried out and the actual combustion temperature of the compositions under study has been measured. To increase the exothermicity of the studied compositions, a “chemical furnace” based on a mixture of Ti–C powders has been used, which allows us to increase the combustion temperature and stabilize the combustion front. It has been found that the actual combustion temperature of the selected compositions increased from 890–1120 to 1000–1350 °C. The results of X-ray powder diffraction and SEM are presented, mechanical and tribological characteristics of the obtained materials are measured, and 3D images of wear grooves are given. It has been found that a decrease in Ti molar fraction and an increase in Al molar fraction in the initial mixture lead to an increase in the mechanical (hardness up to 10.2 GPa, modulus of elasticity up to 215 GPa) and tribological characteristics (wear up to 4.5 times, coefficient of friction up to 2.4 times) of intermetallic materials.

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Section: X-ray Powder Diffraction and Microstructurementioning

confidence: 99%

Relationship between Structure and Properties of Intermetallic Materials Based on γ-TiAl Hardened In Situ with Ti3Al

Авдеева

Bazhina

Antipov

et al. 2023

Metals

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“…In the (TiC + TiB+(TiZr) 5 Si 3 )/TA15 composite, after oxidation, the β-Ti phase forms the layers wetting the α/α GBs (Figure 19) [99]. GB wetting by the second solid phase was observed in a β-solidifying γ-TiAl alloy during β-α transformation [93], α-β phase transformation in a metastable TiZr based alloy [95], single-pass laser welding of 304 stainless steel and TC4 Ti alloy with V interlayer and Cu/V bilayer [97], in the TiAl 2 and TiAl aluminumrich intermetallics [100], Ti6Al4V/TiC composite coatings [102], in titanium aluminide materials manufactured by combustion and high-temperature shear deformation [103], in Ti-30.46 wt%Zr-0.73 wt%Hf-5.29 wt%Al-3.04 wt%V α + β alloy [104], in α + β Ti-4V-6Al titanium alloy [105], in Ti-80 at% W alloys [106], in 4J36/Ni/Cu/V/TC4 diffusion-bonded joints [107], the welded CP-Ti/304 stainless steel and CP-Ti/T2 bimetallic sheets [108], in the near-β Ti-5Mo-5Al-5V-1Fe-1Cr (Ti-55511) alloy [109], the hot isostatic pressed TA15 titanium alloy after solution and aging treatment [110].…”

Section: Influence Of Gb Wetting By the Second Solid Phase On The Pro...mentioning

confidence: 99%

“…In the (TiC + TiB+(TiZr)5Si3)/TA15 composite, after oxidation, the β-Ti phase forms the layers wetting the α/α GBs (Figure 19) [99]. GB wetting by the second solid phase was observed in a βsolidifying γ-TiAl alloy during β-α transformation [93], α-β phase transformation in a metastable TiZr based alloy [95], single-pass laser welding of 304 stainless steel and TC4 Ti alloy with V interlayer and Cu/V bilayer [97], in the TiAl2 and TiAl aluminum-rich intermetallics [100], Ti6Al4V/TiC composite coatings [102], in titanium aluminide materials manufactured by combustion and high-temperature shear deformation [103], in Ti-30.46 wt%Zr-0.73 wt%Hf-5.29 wt%Al-3.04 wt%V α + β alloy [104], in α + β Ti-4V-6Al titanium alloy [105], in Ti-80 at% W alloys [106], in 4J36/Ni/Cu/V/TC4 diffusion-bonded joints [107], the welded CP-Ti/304 stainless steel and CP-Ti/T2 bimetallic sheets [108], in the near-β Ti-5Mo-5Al-5V-1Fe-1Cr (Ti-55511) alloy [109], the hot isostatic pressed TA15 titanium alloy after solution and aging treatment [110]. By changing the Mo content in the Ti-44Al-(0-7)Mo (at%) alloys, the different variants of mutual complete and incomplete GB wetting by the α2, γ, and β o phases were observed (see Figure 20) [111].…”

Section: Influence Of Gb Wetting By the Second Solid Phase On The Pro...mentioning

confidence: 99%

Grain Boundary Wetting by the Second Solid Phase: 20 Years of History

Straumal

Lepkova

Korneva

et al. 2023

Metals

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Grain boundaries (GBs) can be wetted by a second phase. This phase can be not only liquid (or melted), but it can also be solid. GB wetting can be incomplete (partial) or complete. In the case of incomplete (partial) wetting, the liquid forms in the GB droplets, and the second solid phase forms a chain of (usually lenticular) precipitates. Droplets or precipitates have a non-zero contact angle with the GB. In the case of complete GB wetting, the second phase (liquid or solid) forms in the GB continuous layers between matrix grains. These GB layers completely separate the matrix crystallites from each other. GB wetting by a second solid phase has some important differences from GB wetting by the melt phase. In the latter case, the contact angle always decreases with increasing temperature. If the wetting phase is solid, the contact angle can also increase with increasing temperature. Moreover, the transition from partial to complete wetting can be followed by the opposite transition from complete to partial GB wetting. The GB triple junctions are completely wetted in the broader temperature interval than GBs. Since Phase 2 is also solid, it contains GBs as well. This means that not only can Phase 2 wet the GBs in Phase 1, but the opposite can also occur when Phase 1 can wet the GBs in Phase 2. GB wetting by the second solid phase was observed in the Al-, Mg-, Co-, Ni-, Fe-, Cu-, Zr-, and Ti-based alloys as well as in multicomponent alloys, including high-entropy ones. It can seriously influence various properties of materials.

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“…Currently, various types of coatings and their combinations are being studied, the purpose of which is to protect the alloys under consideration from oxidation, such as the oxide coatings demonstrated in [13][14][15][16], intermetallic coatings explored in [17][18][19], as well as other methods to isolate alloy surfaces from aggressive environments described in [14,20,21]. Among other options, there is coating based on an Al-Cr system [22] that can be used for Ti-Al alloy protection.…”

Section: Introductionmentioning

confidence: 99%

Chromium–Aluminum Coatings for Oxidation Protection of Titanium–Aluminum Intermetallic Alloys

Nazarov,

Maslov,

Korznikova

et al. 2023

QuBS

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This article explores the utilization of cathodic-arc deposition Cr-Al overlay coatings as oxidation protection for Ti-Al-Nb intermetallic alloys. The primary objective is to investigate PVD Al-Cr coatings deposited via cathodic-arc deposition without subsequent vacuum annealing. The microstructure, phase, and chemical composition of the coatings were characterized using scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction analysis. Isothermal exposure of samples in a laboratory air furnace was conducted, revealing the efficacy of Cr-Al coatings in protecting the Ti49-11Al-40Nb-1.5Zr-0.75V-0.75Mo-0.2Si (mass%) intermetallic alloy VTI-4 against oxidation. The findings highlight that the as-deposited coatings possess a layered structure and contain Al-Cr intermetallics. Post-exposure to the furnace without prior vacuum annealing results in coatings exhibiting a porous microstructure, raising concerns regarding oxidation protection. This investigation of Cr-Al coatings on a VTI-4 alloy substrate yields valuable insights into their nanolaminate structure and challenges associated with aluminum droplet fractions. The proposed additional vacuum heat treatment at 650 °C for 500 h effectively homogenizes the coating, leading to predominant Cr2Al and Ti-Al phases. Additionally, the formation of diffusion layers at the “coating–substrate” interface and the presence of oxide barriers contribute to the coatings’ heat resistance. Our research introduces possibilities for tailoring coating properties for specific high-temperature applications in aerospace, energy, or industrial contexts. Further refinement of the heat treatment process offers the potential for developing advanced coatings with enhanced performance characteristics.

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Influence of high-temperature annealing on structure of titanium aluminide materials obtained by combustion and high-temperature shear deformation

Cited by 7 publications

References 17 publications

Relationship between Structure and Properties of Intermetallic Materials Based on γ-TiAl Hardened In Situ with Ti3Al

Relationship between Structure and Properties of Intermetallic Materials Based on γ-TiAl Hardened In Situ with Ti3Al

Grain Boundary Wetting by the Second Solid Phase: 20 Years of History

Chromium–Aluminum Coatings for Oxidation Protection of Titanium–Aluminum Intermetallic Alloys

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