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Redistribution of Ti and Al in deuterium charged TiAlThe redistribution of titanium and aluminum in a single-phase TiAl alloy that has been exposed to a high pressure of deuterium gas at high temperature is studied. The microstructure in the as-received, uncharged condition consisted of single-phase gamma TiAl grains and a random distribution of precipitates. Precipitates were distributed throughout the matrix and along the grain boundaries. The chemistry of the precipitates varied considerably; some were rich in Al, while other were mostly Ti with some Si and Al. The dislocation density in most grains was low, although in a few grains a high dislocation density was observed. FCC deuterides with a lattice parameter of 0.45 nm form in a Ti-52.1Al-2.1Ta (at. pct) alloy after exposure to 1.38 MPa of deuterium gas at 650 C for 213 hr. The structure and lattice parameter are consistent with the formation of Ti(l)D2. The deuterides that form in this alloy are enriched in Ti and deficient in Al and Ta compared to the deuteride-free matrix. Regions of the matrix contiguous with the deuterides have a correspondingly enhanced aluminum and tantalum concentration.
Document ID
19920056367
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Legzdina, D.
(NASA Ames Research Center Moffett Field, CA, United States)
Robertson, I. M.
(NASA Ames Research Center Moffett Field, CA, United States)
Birnbaum, H. K.
(Illinois, University Urbana, 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
Accession Number
92A38991
Funding Number(s)
CONTRACT_GRANT: NAG2-602
CONTRACT_GRANT: DE-FG02-91ER-45439
Distribution Limits
Public
Copyright
Other

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