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Titanium aluminides - Surface composition effects as a function of temperatureResults are presented from an AES investigation of the surface characteristics of pure Ti, Ti-14Al-21Nb (alpha-2 aluminide), and Ti-33Al-6Nb-1.4Ta (gamma aluminide) under ultrahigh vacuum conditions over the 20-1000 C temperature range. The observed variations in surface composition are noted to be dramatic and indicative of a direct relationship between the amount of retained oxygen and carbon on the surface and the quantity of Al in that surface's vicinity. While TiO2 was the main surface oxide for pure Ti and the alpha-2 and gamma aluminides, only metallic peaks were observable at 600 C; at 1000 C, metallic Al and Ti were observed.
Document ID
19910037596
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.1016/0956-716X(91)90375-B
Authors
Outlaw, R. A. (NASA Langley Research Center Hampton, VA, United States)
Lee, W. S. (NASA Langley Research Center Hampton, VA, United States)
Sankaran, S. N. (NASA Langley Research Center Hampton, VA, United States)
Wu, D. (NASA Langley Research Center Hampton, VA, United States)
Clark, R. K. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Publication Information
Publication: Scripta Metallurgica et Materialia
Volume: 25
ISSN: 0956-716X
Subject Category
Metallic Materials
Report/Patent Number
ISSN: 0956-716X
Accession Number
91A22219
Distribution Limits
Public
Copyright
Other

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