Formation of titanium nitride on γ-TiAl alloys by direct metal–gas reaction

Sopunna, Kittichai; Thongtem, Titipun; McNallan, Michael J.; Thongtem, Somchai

doi:10.1007/s10853-006-0030-y

Cited by 13 publications

(3 citation statements)

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“…3a and b) were predominantly found inside the γ phase lamellae. Although the Ti 2 N nitrides formation was not observed during reaction of the γ-TiAl alloy surface with gaseous nitrogen (TiN is usually formed instead [44,45]), Ti 2 N was found after ion implantation, probably due to an increased concentration of radiation defects [32]. Results obtained earlier for titanium alloys have suggested that higher ion energy may result in the formation of the Ti 2 N particles rather than TiN [46,47].…”

Section: As-cast Conditions and Effect Of Nitrogen Ion Implantationmentioning

confidence: 92%

“…4): the intensity of the both (221) and (002) peaks from the Ti 2 N phase decreased with an increase in soak time to the level comparable with the background after annealing at 550 • C for 100 h or at 750 • C for 10 h. In contrast the (220) maximum of the TiN phase became stronger with the time increasing. This process can be associated with the development of recovery resulting in a reduction in the point defects concentration and, in turn, in a decrease in the stability of the Ti 2 N nitride particles [26,44,45,50]. However, no other evidence of the recovery development was found.…”

Section: Annealing Effectmentioning

confidence: 99%

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Oxidation resistance and thermal stability of a β-solidified γ-TiAl based alloy after nitrogen ion implantation

et al. 2020

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Section: As-cast Conditions and Effect Of Nitrogen Ion Implantationmentioning

confidence: 92%

Section: Annealing Effectmentioning

confidence: 99%

Oxidation resistance and thermal stability of a β-solidified γ-TiAl based alloy after nitrogen ion implantation

et al. 2020

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“…Apart from this method, surface treatment is an alternative and effective way because of its convenience. The main surface treatments include plasma carburization, laser treatment, gas nitridation, heating technique, microarc oxidation, plasma pack aluminizing, and thermal oxidation treatment . In addition, hot‐press sintering is a possible process route to fabricate a thick coating with metallurgical bond to the substrate.…”

mentioning

confidence: 99%

Microstructure and Tribological Properties of the Ti₃AlC₂ Coating on A Ti–46Al–2Cr–2Nb Alloy

Cheng

et al. 2014

Adv Eng Mater

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TiAl-based intermetallic alloys are of great interest as structural materials for aerospace and automotive industries because they possess lightweight, high oxidation resistance and excellent elevated temperature strength. [1] Recently, besides the improvement of the room-temperature ductility and strength by the control of microstructure and alloying, much attention has also been paid to investigate the tribological properties of the TiAl based alloy under various environments. [2][3][4][5][6] However, several studies show that titanium aluminides have high friction coefficient and poor wear resistance, which are the major disadvantages hindering their practical applications related to tribology. [7] In order to enhance the wear resistance of TiAl intermetallics, we have improved the dry sliding wear resistance of the TiAl alloy by adding hard TiB 2 at the little expense of the mechanical properties. [8] Apart from this method, surface treatment is an alternative and effective way because of its convenience. The main surface treatments include plasma carburization, [9] laser treatment, [10] gas nitridation, [11] heating technique, [12] microarc oxidation, [13] plasma pack aluminizing, [14] and thermal oxidation treatment. [15] In addition, hot-press sintering is a possible process route to fabricate a thick coating with metallurgical bond to the substrate. Again, this method can fabricate the substrate and coating simultaneously from their individual powders, which would be favorable to enhance the adhesion and reduce internal stress between the coating and substrate.There are numerous moving machine assemblies in aerospace which operate in vacuum. Friction and wear are of vital importance in determining the efficiency, durability, reliability, and robustness of tribological systems in the applications. TiAl-based alloy is promising for aerospace applications, but in our previous work, it was found that the TiAl alloy in vacuum exhibits high friction coefficient and moderate wear rate. To overcome the shortfall, we attempt to prepare a Ti 3 AlC 2 self-lubricating coating on the Ti-46Al-2Cr-2Nb alloy substrate. Ti 3 AlC 2 is a member of MAX phase with layer structure like traditional solid lubricants, graphite, and MoS 2 . [16] Very recently, our group firstly found that Ti 3 AlC 2 exhibits excellent self-lubricity under vacuum degree from 2.0 Â 10 4 to 5 Pa with the coefficient of friction (CoF) as low as 0.2 and nearly no wear. [17] Again, the constituents of the TiAl and Ti 3 AlC 2 are very close, which may be very helpful to reduce interface stress and obtain high cohesion between the substrate and coating if Ti 3 AlC 2 is coated on TiAl surfaces.Based on the advantages mentioned above, in this work, a Ti 3 AlC 2 material was selected as coating on a Ti-46Al-2Cr-2Nb alloy via hot-press sintering process. The microstructure and hardness of the Ti 3 AlC 2 coating on Ti-46Al-2Cr-2Nb alloy were examined, and tribological behavior of the coating was evaluated in low vacuum. Also, the tribological properties of the...

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Synthesis and analysis of CuS with different morphologies using cyclic microwave irradiation

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Formation of titanium nitride on γ-TiAl alloys by direct metal–gas reaction

Cited by 13 publications

References 7 publications

Oxidation resistance and thermal stability of a β-solidified γ-TiAl based alloy after nitrogen ion implantation

Oxidation resistance and thermal stability of a β-solidified γ-TiAl based alloy after nitrogen ion implantation

Microstructure and Tribological Properties of the Ti₃AlC₂ Coating on A Ti–46Al–2Cr–2Nb Alloy

Synthesis and analysis of CuS with different morphologies using cyclic microwave irradiation

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Formation of titanium nitride on γ-TiAl alloys by direct metal–gas reaction

Cited by 13 publications

References 7 publications

Oxidation resistance and thermal stability of a β-solidified γ-TiAl based alloy after nitrogen ion implantation

Oxidation resistance and thermal stability of a β-solidified γ-TiAl based alloy after nitrogen ion implantation

Microstructure and Tribological Properties of the Ti3AlC2 Coating on A Ti–46Al–2Cr–2Nb Alloy

Synthesis and analysis of CuS with different morphologies using cyclic microwave irradiation

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Microstructure and Tribological Properties of the Ti₃AlC₂ Coating on A Ti–46Al–2Cr–2Nb Alloy