Effects of plasma surface Ta alloying on the tribology behavior of γ-TiAl

Wei, Dongbo; Zhou, Xuan; Li, F.-K.; Li, M.-F.; Li, S.-Q.; Zhang, P.-Z.

doi:10.2298/jmmb200617002w

Cited by 3 publications

(3 citation statements)

References 14 publications

(15 reference statements)

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“…Results of those investigations were shown in Fig 8 . These investigations confirmed that the interdendritic zones are rich in carbides precipitates of (W, Ti) C2 type and intermetallic compounds such as TiAl, TiAl2 and TiAl3. The Ti-Al compounds have generally beneficial effect on high temperature properties of materials [40]. should be assumed that interdendritic zones are characterized by a strongly lower concentration of tungsten and rhenium than the dendritic zone (assumption for solid solution).…”

Section: Resultsmentioning

confidence: 99%

Primary microstructure characterization of Co-20Ni-9Al-7W-3Re-2ti superalloy

Tomaszewska

2022

J min metall B Metall

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The characterization of the primary microstructure of the new Co-based superalloy of Co-20Ni-9Al-7W-3Re-2Ti type was shown in this article. The investigated alloy was manufactured by induction melting process from pure feedstock materials. The fundamental technological problem related to Co-Al-W-X multicomponent alloys' casting process is a strong susceptibility to interdendritic segregation of alloying elements, especially tungsten and rhenium. The performed analysis revealed that the observed effect of alloying elements segregation is detectable and much stronger than for Co-9Al-9W and Co-20Ni-7Al-7W alloys, related to titanium, nickel and aluminium migration to inter-dendritic spaces. Consequently, the tungsten concentration gradient between dendritic and interdendritic zones is higher than for Co-9Al-9W and Co-20Ni-7Al-7W alloys. The same situation is in the case of rhenium and cobalt, but Co's concentration in the interdendritic zone is only slightly lower.

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Section: Resultsmentioning

confidence: 99%

Primary microstructure characterization of Co-20Ni-9Al-7W-3Re-2ti superalloy

Tomaszewska

2022

J min metall B Metall

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“…Double glow technique has been used to fabricate Nb, Cr, Cu and Mo etc coatings successfully [18,19]. Coating fabricated by double glow technique has excellent bonding strength, which attributes to the formation of diffusion layer [20].…”

Section: Introductionmentioning

confidence: 99%

High temperature oxidation behaviors of Al/Cr composite coating on Ti₂AlNb alloy

Yang,

Liang,

et al. 2024

Mater. Res. Express

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The Al/Cr coatings were deposited on Ti2AlNb alloy by magnetron sputtering and double glow plasma alloying technology to improve the oxidation resistance. The morphology of the protective coating was investigated by scanning electron microcopy and the phase composition of the coating was analyzed using X-ray diffraction. The results suggested that the protective coating with multilayer structure was dense and homogeneous. The formation of Cr inner diffusion layer was beneficial to the bonding strength between the coating and substrate, which was attributable to the double glow technology. The oxidation behaviors of Al/Cr coating were investigated by the isothermal oxidation tests for 100 h at 700°C, 800°C and 900°C, respectively. The results indicated that the protective coating showed a lower oxidation rate. At 700°C, the Al2O3 oxidation products were formed on the surface of coating at high temperature, which were dense and homogeneous against oxygen diffusion. With the increase of oxidation temperature, the external diffusion of Cr element reacted with oxygen to form Cr2O3, which provided the further protection. As for 900°C, the volatile CrO3 was formed by the reaction of the external diffusion of Cr and Cr2O3, and the oxidation products Al2O3 and Cr2O3 continued to provide protection for Ti2AlNb alloy.

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“…The scope of intermetallic compounds based on γ-TiAl in a wider range of industrial applications is limited due to their low tribological characteristics [16]. In addition, the use of alloys based on γ-TiAl is limited due to their insufficient resistance to oxidation at temperatures above 700-750 • C [17,18]. Poor sliding friction and low wear resistance become an obstacle to improving the axial load and service life of γ-TiAl alloy components under extreme conditions [19].…”

Section: Introductionmentioning

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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Effects of plasma surface Ta alloying on the tribology behavior of γ-TiAl

Cited by 3 publications

References 14 publications

Primary microstructure characterization of Co-20Ni-9Al-7W-3Re-2ti superalloy

Primary microstructure characterization of Co-20Ni-9Al-7W-3Re-2ti superalloy

High temperature oxidation behaviors of Al/Cr composite coating on Ti₂AlNb alloy

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

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Effects of plasma surface Ta alloying on the tribology behavior of γ-TiAl

Cited by 3 publications

References 14 publications

Primary microstructure characterization of Co-20Ni-9Al-7W-3Re-2ti superalloy

Primary microstructure characterization of Co-20Ni-9Al-7W-3Re-2ti superalloy

High temperature oxidation behaviors of Al/Cr composite coating on Ti2AlNb alloy

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

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High temperature oxidation behaviors of Al/Cr composite coating on Ti₂AlNb alloy