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

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1016/j.intermet.2016.04.005
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Name affiliation
  1. National Research Council of Canada. Aerospace
FormatText, Article
SubjectIntermetallics (aluminides); Oxidation; Casting; Microstructure; Microscopy; Aerospace structures
Abstract
A 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
In
  • Intermetallics 74: 8–14.
LanguageEnglish
Peer reviewedYes
IdentifierS0966979516301182
NPARC number23000322
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Record created2016-07-07
Record modified2020-03-16
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