Oxide thermal stability on gamma titanium aluminide.

摘要

Surface composition plays an important role in hydrogen embrittlement of the TiAl-based structural alloys proposed for NASP. A clear understanding of the thermal stability of the oxide on the various titanium aluminides will give important insight into the way that hydrogen reacts with these materials in the initial step of the hydriding process. The present work addresses these issues by using surface probes to analyze the thermal stability of an oxide formed under atmospheric conditions on gamma titanium aluminide. X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES) have been employed to characterize the surface composition and bonding when the oxidized material is annealed to (approximately)600(degree)C in vacuum. The measurements show that the oxygen is largely preserved at the surface while the aluminum-oxide bond becomes more prominent. (ERA citation 15:034972)