High temperature oxidation of Ti–46Al–6Nb–0.5W–0.5Cr–0.3Si–0.1C alloy

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DOIResolve DOI: http://doi.org/10.1016/j.intermet.2016.04.005
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TypeArticle
Journal titleIntermetallics
ISSN0966-9795
Volume74
Pages814
SubjectIntermetallics (aluminides); Oxidation; Casting; Microstructure; Microscopy; Aerospace structures
AbstractA newly developed Ti–46Al–6Nb-0.5W-0.5Cr-0.3Si-0.1C alloy was oxidized isothermally and cyclically in air, and its high-temperature oxidation behavior was investigated. When the alloy was isothermally oxidized at 700 °C for 2000 h, the weight gain was only 0.15 mg/cm². The parabolic rate constant, kp (mg²/cm⁴·h), measured from isothermal oxidation tests was 0.002 at 900 °C and 0.009 at 1000 °C. Such excellent isothermal oxidation resistance resulted from the formation of the dense, continuous Al₂O₃ layer between the outer TiO₂ layer and the inner (TiO₂-rich, Al₂O₃-deficient) layer. The alloy also displayed good cyclic oxidation resistance at 900 °C. Some noticeable scale spallation began to occur after 68 h at 1000 °C during the cyclic oxidation test.
Publication date
PublisherElsevier
LanguageEnglish
AffiliationAerospace; National Research Council Canada
Peer reviewedYes
IdentifierS0966979516301182
NPARC number23000322
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Record identifierb39f6a9b-8ec4-40ad-86e2-bb1c6c7f3f67
Record created2016-07-07
Record modified2016-07-07
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