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Very Long Term Oxidation of Ti-48Al-2Cr-2Nb at 704 C In AirIntroduction Titanium aluminides are of great interest for intermediate-temperature (600 C - 850 C) aerospace and power generation applications because of their high specific properties. Replacement of conventional superalloys by titanium aluminides offers the potential of significant weight savings. Extensive development efforts over the past IO years have led to the identification of y (TiAl) + alpha(sub 2) (Ti3Al) alloys, such as the G.E. alloy Ti48Al-2Cr-2Nb (all composition in at. %), which offer a balance of room temperature mechanical properties and high-temperature strength retention. The two phase gamma + alpha(sub 2) class of titanium aluminides also offers superior oxidation and embrittlement resistance compared to the alpha(sub 2) and orthorhombic classes of titanium aluminides. However, environmental durability is still a major concern. Significant progress has recently been made in understanding the fundamental aspects of the oxidation behavior of binary gamma + alpha(sub 2) Ti-Al alloys. However, most of this work has concentrated on short term (less than 1000 hours), high temperature (900 C - 1000 C) exposures. Also little data are available in the literature regarding the oxidation behavior of the quaternary and higher order gamma + alpha(sub 2) engineering alloys. This is especially true for the very long-term, low temperature conditions likely to be experienced during engineering applications. The present work addresses this regime to fill this gap by characterizing the oxidation behavior of Ti48Al-2Cr-2Nb for periods up to 9000 h at 704 C in air.
Document ID
19990018982
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Locci, I. E.
(NASA Lewis Research Center Cleveland, OH United States)
Brady, M. P.
(NASA Lewis Research Center Cleveland, OH United States)
MacKay, R. A.
(NASA Lewis Research Center Cleveland, OH United States)
Smith, J. W.
(NYMA, Inc. Brook Park, OH United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1997
Publication Information
Publication: Scripta Materialia
Publisher: Elsevier Science Ltd.
Volume: 37
Issue: 6
ISSN: 1359-6462
Subject Category
Metallic Materials
Distribution Limits
Public
Copyright
Other

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