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Oxidation Kinetics of Cast TiAl3The isothermal oxidation kinetics of the TiAl3 compound over a wide temperature range is documented, and these rates are related to exclusive alpha-Al2O3 scale growth. The specific weight change vs time curves are shown. Two abnormalities are immediately apparent. One is that a rapid initial uptake of oxygen occurs at times less than 5 h, followed by a lower oxidation rate at longer times, for tests at 900 C and below. The other is that the final weight changes for the 700, 800, and 900 C tests are not in the sequence expected with respect to temperature. Isothermal oxidation of drop cast TiAl above 1000 C was found to exhibit parabolic oxidation controlled by protective alpha-Al2O3 scale formation. TiAl is the only phase in the binary Ti-Al system that forms exclusive scales of alpha-Al2O3 in isothermal oxidation. High anomalous rates at short times and at temperatures below 1000 C resulted from the internal oxidation of a second phase of aluminum.
Document ID
19920056369
Document Type
Reprint (Version printed in journal)
Authors
Smialek, J. L. (NASA Lewis Research Center Cleveland, OH, United States)
Humphrey, D. L. (NASA Lewis Research Center; Sverdrup Technology, Inc. Cleveland, OH, United States)
Date Acquired
August 15, 2013
Publication Date
June 1, 1992
Publication Information
Publication: Scripta Metallurgica et Materialia
Volume: 26
Issue: 11 J
ISSN: 0956-716X
Subject Category
METALLIC MATERIALS
Report/Patent Number
E-6634
Distribution Limits
Public
Copyright
Other