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Durability Assessment of TiAl AlloysThe durability of TiAl is a prime concern for the implementation of TiAl into aerospace engines. Two durability issues, the effect of high temperature exposure on mechanical properties and impact resistance, have been investigated and the results are summarized in this paper. Exposure to elevated temperatures has been shown to be detrimental to the room temperature ductility of gamma alloys with the most likely mechanisms being the ingress of interstitials from the surface. Fluorine ion implantation has been shown to improve the oxidation resistance of gamma alloys, and ideally it could also improve the environmental embrittlement of high Nb content TiAl alloys. The effect of F ion implantation on the surface oxidation and embrittlement of a third generation, high Nb content TiAl alloy (Ti-45Al-5Nb-B-C) were investigated. Additionally, the ballistic impact resistance of a variety of gamma alloys, including Ti-48Al-2Cr- 2Nb, Ti-47Al-2Cr-2Nb, ABB-2, ABB-23, NCG359E, 95A and Ti-45Al-5Nb-B-C was accessed. Differences in the ballistic impact properties of the various alloys will be discussed, particularly with respect to their manufacturing process, microstructure, and tensile properties.
Document ID
20080047349
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Draper, Susan L.
(NASA Glenn Research Center Cleveland, OH, United States)
Lerch, Bradley A.
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 24, 2013
Publication Date
March 9, 2008
Subject Category
Metals And Metallic Materials
Report/Patent Number
E-16700
Funding Number(s)
WBS: WBS 599489 02.07.03.02.04.01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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