NASA NTRS · 19910037596
Titanium aluminides - Surface composition effects as a function of temperature
Abstract
Results 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.
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Outlaw, R. A., Lee, W. S., Sankaran, S. N., Wu, D., Clark, R. K.. 1991-01-01. Titanium aluminides - Surface composition effects as a function of temperature. https://ntrs.nasa.gov/citations/19910037596
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