Oxidation resistance of TiAl alloy improved by hot-pack rolling and cyclic heat treatment

Tian, Shiwei; He, Anrui; Liu, Jianhua; Zhang, Yefei; Yang, Yugui; Zhang, Yun; Jiang, Haitao

doi:10.1016/j.matchar.2021.111196

Cited by 20 publications

(10 citation statements)

References 54 publications

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“…However, the rutile form of oxide tends to be porous and non-adherent at elevated temperatures, significantly compromising its protective properties. The reason for the oxide scale spallation can therefore be explained by the loose structure of the TiO 2 scale developed at 800 °C, resulting in weak adhesion between the scale and the substrate [22,23]. A further reason is the coefficient of thermal expansion (CTE) mismatch between the oxide scale and the Ti-6Al-4V substrate [24].…”

Section: Resultsmentioning

confidence: 99%

“…Only a small amount of the SiO 2 phase was detected in the coating oxidised for 660 h, almost below the detection limit for the XRD analysis. This relatively low SiO 2 (ICDD card: 01-086-1562) content can be attributed to the lower standard free energy of formation of α-Al and SiO 2 (ΔG f = −713 kJ•mol −1 ) over the temperature range spanning from ambient conditions to the oxidation temperature (800 °C) [22].…”

Section: Structure Changes After Oxidationmentioning

confidence: 99%

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Cyclic oxidation of slurry silicide-aluminide coatings formed on Ti-6Al-4V alloy

Kochmańska,

Kochmański

2023

Surface Engineering

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A proprietary slurry cementation method was used to produce silicide-aluminide coatings on alloy Ti-6Al-4V. The cementation processes were carried out at 900-1100 °C for 2-6 h. The coatings exhibited a stratified configuration characterised by a phase arrangement that demonstrates favourable attributes pertaining to mechanical and corrosion resistance capabilities, namely, the presence of aluminium-enriched phases at the coating surface and titanium-enriched phases proximity to the substrate. The cyclic oxidation behaviour at 800 °C for 30 twenty-two-hour cycles was investigated. The characterisation of the structure of coatings was carried out through the use of scanning microscopy, X-ray microanalysis, and Xray diffraction techniques. The coatings have excellent resistance to cyclic oxidation, resulting from the gradient structure and the establishment of a protective alumina layer on the surface. The coatings were characterised by good resistance to thermal shocks. The microcracks formed during thermal shocks were filled with an alumina, which renders the coatings self-healing.

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Section: Resultsmentioning

confidence: 99%

Section: Structure Changes After Oxidationmentioning

confidence: 99%

Cyclic oxidation of slurry silicide-aluminide coatings formed on Ti-6Al-4V alloy

Kochmańska,

Kochmański

2023

Surface Engineering

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“…Then, since the free enthalpy of Al 2 O 3 and TiO 2 is relatively close, they are basically formed at the same time, and the growth kinetics of overall alloy oxide film is divided between the two growth kinetics. Due to the rapid outward diffusion of Ti atoms, holes are generated between the oxide films according to the Kirkendall effect [36]. Finally, when the overall oxide film of the alloy reaches a certain thickness, the diffusion rate of all diffusion media in the oxidation process will decrease, so the oxidation weight gain rate of the corresponding alloy becomes smaller.…”

Section: Oxidation Mechanismmentioning

confidence: 99%

Oxidation properties of Ti-47.5Al-2.5V-1.0Cr-0.2Zr alloy at 950–1050 °C

Lin

Huang

Yuan

et al. 2023

Materials Science and Technology

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Oxidation experiments of a Ti-47.5Al-2.5V-1.0Cr-0.2Zr alloy were carried out at 950, 1000 and 1050 °C. The alloy's oxidation kinetics curve, oxidation products, oxide film structure and oxidation mechanism at different oxidation temperatures and times were studied systematically. The oxide film has an obvious multilayer structure. Oxygen diffuses into the matrix alloy, and two oxides (TiO2 and Al2O3) grow alternately in layers to produce multilayer structures. As the oxidation process continues, oxygen atoms continue to diffuse in the matrix, there are holes and cracks in the oxide film, and the oxidation resistance of the oxide film is weakened.

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“…Since the 70s of last century, researchers have regarded increasing the working temperature and reducing the weight of parts as two important goals for the new high-temperature structural materials [1][2][3][4][5]. Among the intermetallic compounds, TiAl alloys have great potential to be applied to aerospace structural parts due to their high-temperature strength and stiffness higher than that of Ni-based and Ti-based alloys [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Constitutive equation and microstructure evolution of TiAl alloy during hot deformation

Tian,

Yang,

Zhang

et al. 2023

Mater. Res. Express

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The hot deformation behavior of TiAl alloy is analyzed by combining the true stress-strain curve and microstructure analysis. The results show that the flow stress of TiAl alloy presents the characteristics of work hardening-dynamic softening, it increases with the increase of strain rate and decreases with the increase of temperature. Based on the true stress-strain curves, the flow stress of TiAl alloy under different deformation conditions is predicted by hyperbolic sinusoidal formula. In addition, the effects of deformation temperature and strain rate on the microstructure evolution of TiAl alloy are revealed. In the process of hot compression deformation, dynamic recrystallization and γ→α, β→α phase transformation occurs. During tensile deformation, TiAl alloy exhibits super-plasticity, which is mainly due to grain rotation and coordinated deformation of β phase.

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Oxidation resistance of TiAl alloy improved by hot-pack rolling and cyclic heat treatment

Cited by 20 publications

References 54 publications

Cyclic oxidation of slurry silicide-aluminide coatings formed on Ti-6Al-4V alloy

Cyclic oxidation of slurry silicide-aluminide coatings formed on Ti-6Al-4V alloy

Oxidation properties of Ti-47.5Al-2.5V-1.0Cr-0.2Zr alloy at 950–1050 °C

Constitutive equation and microstructure evolution of TiAl alloy during hot deformation

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