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Oxidation Behavior of Gamma-Titanium Aluminide Alloys

Published online by Cambridge University Press:  26 February 2011

Douglas W. Mckee  and
Shyhchin C. Huang
Douglas W. Mckee
Affiliation:
General Electric Company, Research and Development Center, P.O. Box 8, Schenectady, NY 12301
Shyhchin C. Huang
Affiliation:
General Electric Company, Research and Development Center, P.O. Box 8, Schenectady, NY 12301
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Abstract

The oxidation behavior of a number of gamma-TiAl alloys with ternary additions has been studied for extended periods during rapid thermal cycling to temperatures of up to 1000°C in flowing air. Under these conditions, binary alloys, such as Ti-48a/oAl and Ti-52a/oAl form flaking scales with sub-scale embrittlement, although the initial oxidation rate decreases with increasing aluminum content. Ternary Ti-Al-Cr and Ti-Al-Ta alloys with up to 4 a/o Cr or Ta also show a tendency to form spalling scales at these temperatures. On the other hand, the addition of niobium or tungsten results in a dramatic improvement in oxidation resistance at 850 °C, although at 1000°C even these alloys begin to spall after an induction period of several hundred hours.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 939
Copyright
Copyright © Materials Research Society 1991

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References

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