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Interfacial reaction kinetics of coated SiC fibers with various titanium alloysThe kinetics of the reaction between the silicon carbide fibers and the titanium-based alloy matrix was investigated at temperatures from 800 to 1000 C for several titanium-based alloys (including Ti-1100 alloy and BETA 21S) and unalloyed Ti, reinforced with coated silicon carbide fiber SCS-6. The reaction zone growth kinetics was studied by exposing vacuum encapsulated samples to temperatures from 700 to 1000 C for times up to 150 hrs, followed by SAM observations of samples which were polished perpendicular to the fiber axis and etched. It was found that the reaction zone growth kinetics of the alpha (hcp) and beta (bcc) phases of unalloyed titanium reacting with SCS-6 fibers exhibited different values of the apparent activation energy and of the preexponential factor. Additions of other metals to Ti was found to slow down the reaction kinetics. Among the alloys studied, the Ti-1100 was the slowest reacting conventional alloy and the Ti-14Al-21Nb (in wt pct) was the slowest overall.
Document ID
19910040146
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Gundel, D. B.
(Virginia Univ. Charlottesville, VA, United States)
Wawner, F. E.
(Virginia, University Charlottesville, United States)
Date Acquired
August 14, 2013
Publication Date
February 1, 1991
Publication Information
Publication: Scripta Metallurgica et Materialia
Volume: 25
ISSN: 0956-716X
Subject Category
Composite Materials
Accession Number
91A24769
Funding Number(s)
CONTRACT_GRANT: NAG1-745
Distribution Limits
Public
Copyright
Other

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