Oxidation characteristics of Ti-33Al-6Nb-1.4TaStatic oxidation kinetics of the gamma titanium-aluminide alloy Ti-33Al-6Nb-1.4Ta (wt pct) have been investigated in air from 700 to 1000 C and in oxygen from 800 to 1000 C using thermogravimetric analysis. The oxidation kinetics were controlled by the presence of alumina for all oxygen exposures and in air below 800 C, while the kinetics in air above 800 C were more complex. Oxidation products were identified using X-ray diffraction techniques. Oxide scale morphology was examined by SEM and TEM of the surfaces and across sections of oxidized specimens. The oxidation products formed depended on the exposure: Al2O3 and TiO2 were identified on all specimens exposed in and air and oxygen; the nitride phases TiN and Ti2AlN were also found on specimens exposed in air.
Document ID
19930029611
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Wallace, T. A. (NASA Langley Research Center Hampton, VA, United States)
Clark, R. K. (NASA Langley Research Center Hampton, VA, United States)
Sankaran, S. N. (NASA Langley Research Center Hampton, VA, United States)
Wiedemann, K. E. (Analytical Services and Materials, Inc. Hampton, VA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Publication Information
Publication: In: Environmental effects on advanced materials (A93-13601 02-23)