Oxidation behavior of a novel multi-element alloyed Ti2AlNb-based alloy in temperature range of 650–850 °C

He, Yong-Sheng; Hu, Rui; Luo, Wei; He, Tao; Liu, Xianghong

doi:10.1007/s12598-018-1101-3

Cited by 17 publications

(8 citation statements)

References 31 publications

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“…It was reported that the formation of the TiNb 2 O 7 and Nb 2 Zr 6 O 17 oxides had not improved oxidation resistance, whereas the AlNbO 4 oxide formation resulted in sluggish oxidation kinetics. On the contrary, a number of studies demonstrated the detrimental effect of the AlNbO 4 oxide on the oxidation resistance [53,54,55,56,57].…”

Section: Discussionmentioning

confidence: 99%

Oxidation Behavior of Refractory AlNbTiVZr0.25 High-Entropy Alloy

et al. 2018

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Oxidation behavior of a refractory AlNbTiVZr0.25 high-entropy alloy at 600–900 °C was investigated. At 600–700 °C, two-stage oxidation kinetics was found: Nearly parabolic oxidation (n = 0.46–0.48) at the first stage, transitioned to breakaway oxidation (n = 0.75–0.72) at the second stage. At 800 °C, the oxidation kinetics was nearly linear (n = 0.92) throughout the entire duration of testing. At 900 °C, the specimen disintegrated after 50 h of testing. The specific mass gains were estimated to be 7.2, 38.1, and 107.5, and 225.5 mg/cm2 at 600, 700, and 800 °C for 100 h, and 900 °C for 50 h, respectively. Phase compositions and morphology of the oxide scales were analyzed using X-ray diffraction (XRD) and scanning electron microscopy (SEM). It was shown that the surface layer at 600 °C consisted of the V2O5, VO2, TiO2, Nb2O5, and TiNb2O7 oxides. Meanwhile, the scale at 900 °C comprised of complex TiNb2O7, AlNbO4, and Nb2Zr6O17 oxides. The oxidation mechanisms operating at different temperatures were discussed and a comparison of oxidation characteristics with the other alloys was conducted.

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Section: Discussionmentioning

confidence: 99%

Oxidation Behavior of Refractory AlNbTiVZr0.25 High-Entropy Alloy

et al. 2018

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“…This monoclinic compound (space group 12) is currently investigated as a material for thermal barrier coatings due to its low thermal conductivity. [61] But it is reported to have poor protection against oxidation [62,63] and an anisotropic thermal expansion behavior, [64] although not as severe as NbO 2 . For a thermal shock-resistant and heat-conducting composite, its formation can be assessed as detrimental.…”

Section: Discussionmentioning

confidence: 99%

Nanoscale Oxide Formation at α‐Al₂O₃–Nb Interfaces

et al. 2023

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Parts for metallurgical applications made from refractory metal–ceramic composites offer improved thermal shock resistance due to their capability for resistive heating compared to ones made solely from ceramics such as Al2O3. The combination of Al2O3 and Nb is intriguing as both show similar thermal expansion behavior over a wide temperature range. The high affinity of Nb for O to form nonprotective oxides, however, hampers its use in oxidative environments. Formation of such phases at the ceramic–metal interface can have detrimental effects on the cohesion of the composites. For this work, nanocrystalline Nb films are deposited on sapphire substrates by magnetron sputtering to study diffusion of O and high‐temperature phase formation at a refractory metal–ceramic interface during heat treatment under Ar at 1600 °C. A combined approach of atom probe tomography and transmission electron microscopy for compositional and crystallographic analyses reveals that at triple junctions of the sapphire–Nb interface with Nb grain boundaries, heterogeneous nucleation of nanoscale NbO2 occurs, which further reacts with Al2O3 to form AlNbO4, while the Nb film itself remains metallic. Fast O transport through grain boundaries leads to internal oxidation at the interface, whereas regions further away from Nb grain boundaries remain unchanged.

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“…M M Wang et al [9][10][11] reported that the element of Al can enhance the oxidation resistance of Ni-based superalloy, which attribute to the formation of Al 2 O 3 phase with extremely dense. Y S He et al [12] reported that Nb could improve oxidation resistance because of the controlled of mass transfer of TiO 2 . However, the with the content of Nb increasing, the oxidation resistance was depressed due to the other products formed such as AlNbO 4 and TiNb 2 O 7 phase.…”

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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Oxidation behavior of a novel multi-element alloyed Ti2AlNb-based alloy in temperature range of 650–850 °C

Cited by 17 publications

References 31 publications

Oxidation Behavior of Refractory AlNbTiVZr0.25 High-Entropy Alloy

Oxidation Behavior of Refractory AlNbTiVZr0.25 High-Entropy Alloy

Nanoscale Oxide Formation at α‐Al₂O₃–Nb Interfaces

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

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Oxidation behavior of a novel multi-element alloyed Ti2AlNb-based alloy in temperature range of 650–850 °C

Cited by 17 publications

References 31 publications

Oxidation Behavior of Refractory AlNbTiVZr0.25 High-Entropy Alloy

Oxidation Behavior of Refractory AlNbTiVZr0.25 High-Entropy Alloy

Nanoscale Oxide Formation at α‐Al2O3–Nb Interfaces

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

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Nanoscale Oxide Formation at α‐Al₂O₃–Nb Interfaces

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