Influence of water vapour on the oxidation behaviour of titanium aluminides

Zeller, Alexander; Dettenwanger, F.; Schütze, M.

doi:10.1016/s0966-9795(01)00104-2

Cited by 57 publications

(36 citation statements)

References 26 publications

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“…However the most promising results were obtained with fluorine. The effect of fluorine treatments was observed for isothermal and cyclic exposure conditions even in wet atmospheres [16,17] up to 1050 8C whereas chlorine-treated samples spalled during cyclic tests, especially in wet atmospheres [18]. In addition, previous investigations showed that fluorine treatments were effective with alloys containing at least 40 at% aluminium [13].…”

Section: Introductionmentioning

confidence: 99%

Influence of alloy compositions on the halogen effect in TiAl alloys

Masset

Neve

Zschau

et al. 2008

Materials & Corrosion

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F-implantation concentration profile simulations were carried out and the influence of the ion fluence, implantation energy as well as the alloy composition were investigated. For alloys with Al contents between 40 and 50 at% the conditions to get the halogen effect were assessed by thermodynamic calculations. According to the thermodynamic predictions the implantation parameters were kept constant in this composition range. The implanted alloys were exposed in laboratory air over 4000 h. With the implantation parameters used (20 keV and 1 Â 10 17 F/cm 2 ), the halogen effect was found to be efficient over 4000 h. The oxide growth kinetic constants were measured and vary between 1.2 and 2.7 Â 10 À13 g 2 / cm 4 /s.

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Section: Introductionmentioning

confidence: 99%

Influence of alloy compositions on the halogen effect in TiAl alloys

Masset

Neve

Zschau

et al. 2008

Materials & Corrosion

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“…The effects of water vapor on the oxidation behavior and mechanical properties of intermetallics have not been extensively studied [29][30][31][32]. Zeller et al [29] found that water vapor causes a significant increase in the oxidation kinetics accompanied by a change in the microstructure and morphology of the oxide layer in TiAl alloys. Pint et al [31] observed an increase in the level of spallation in NiAl intermetallics with increasing water vapor content, particularly if they do not contain small amounts of elements such as Y or Hf.…”

Section: Introductionmentioning

confidence: 99%

Water vapor effect on high-temperature oxidation behavior of Fe₃Al intermetallics

Chevalier

Juzoń

Przybylski

et al. 2009

Science and Technology of Advanced Materials

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Nb) were oxidized at 950• C in dry and humid (11 vol% water) synthetic air. Thermogravimetric measurements showed that the oxidation rates of the tested intermetallics were lower in humid air than in dry air (especially for Fe 3 Al-Zr,Mo and Fe 3 Al-Zr,Mo,Nb). The addition of small amounts of Zr, Mo or Nb improved the kinetics compared with that of the undoped Fe 3 Al. Fe 3 Al showed massive spallation, whereas Fe 3 Al-Zr, Fe 3 Al-Zr,Mo and Fe 3 Al-Zr,Mo,Nb produced a flat, adherent oxide layer. The rapid transformation of transient alumina into alpha alumina may explain the decrease in the oxidation rate in humid air.

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“…This observation suggests that the oxygen dissolution kinetics in the metal is independent of the external oxide layer thickness and is not affected by the potential presence in the metal of hydrogen coming from H 2 O dissociation [18]. The fact that the O-enriched layer thickness does not depend on the thickness of the external TiO 2 scale is expected when considering that oxygen which dissolves into the metal comes from the dissociation of Ti oxide at the metal/oxide interface.…”

Section: Discussionmentioning

confidence: 79%

“…Furthermore, H 2 O molecules can dissociate in H atoms and OH Á species. Their dissolution inside the oxide lattice will lead to a change of the defect chemistry and, in consequence, of the transport and growth processes [18].…”

Section: Discussionmentioning

confidence: 99%

NaCl-Induced High-Temperature Corrosion of β21S Ti Alloy

et al. 2017

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 18114 Abstract Titanium alloys are very interesting for aeronautics applications because of their low density, high mechanical resistance and good resistance to corrosion in aggressive environments. However, recent developments impose the use of these materials at higher temperatures than those initially envisaged (above 400°C), revealing some uncertainties of their behavior. Depending on the operating conditions, the material can be exposed to variable humidity levels and, in some cases, can be in contact with silica or marine salt. This study aims to evaluate the influence of NaCl solid deposit on the behavior of b21S Ti alloy at 560°C under realistic ambient atmospheres. The tests were carried out in laboratory air and in water vapor-enriched air, on uncoated samples and on samples with solid NaCl deposit. The reaction-product evolution (up to 600 h) was characterized by thermogravimetric analysis, SEM observations (surface and cross section), XRD and microhardness profiling on cross sections. An aggravation of the corrosion phenomena in the presence of NaCl solid deposit was observed, that was related to the presence of gaseous metal chlorides, leading to the establishment of an active corrosion process.

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Influence of water vapour on the oxidation behaviour of titanium aluminides

Cited by 57 publications

References 26 publications

Influence of alloy compositions on the halogen effect in TiAl alloys

Influence of alloy compositions on the halogen effect in TiAl alloys

Water vapor effect on high-temperature oxidation behavior of Fe₃Al intermetallics

NaCl-Induced High-Temperature Corrosion of β21S Ti Alloy

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Influence of water vapour on the oxidation behaviour of titanium aluminides

Cited by 57 publications

References 26 publications

Influence of alloy compositions on the halogen effect in TiAl alloys

Influence of alloy compositions on the halogen effect in TiAl alloys

Water vapor effect on high-temperature oxidation behavior of Fe3Al intermetallics

NaCl-Induced High-Temperature Corrosion of β21S Ti Alloy

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Water vapor effect on high-temperature oxidation behavior of Fe₃Al intermetallics