Oxide properties of a gamma titanium aluminide: A surface science study

Conference · Tue Jan 01 00:00:00 EST 1991

OSTI ID:5401907

Taylor, T N; Paffett, M T

The surface properties of oxides grown on a gamma titanium aluminide (2 at. % Nb) have been examined using a x-ray photoelectron spectroscopy (XPS) and secondary-ion mass spectroscopy (SIMS). An oxide formed on the sample during air exposure at room temperature was thermally destabilized in ultra-high vacuum. The heating largely decomposed the advanced Ti oxidation states to give a predominate +2 valence configuration at 600{degrees}C, while the Al oxide was somewhat enhanced for the same treatment. Growth of a post chemisorption oxide for various temperatures and exposure times at pressures {le} 10{sup {minus}6} Torr oxygen revealed the progressive development of Ti and AL oxide. At a temperature of 600{degrees}C the Ti component was greatly enhanced relative to the Al content in the surface region. This separation of Ti from Al was clearly visible in SIMS measurements. The development and thermal stability of these oxides is in agreement with the heats of formation and available valence states for the two majority components in the material. 12 refs., 4 figs.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5401907
• Report Number(s): LA-UR-91-2679; CONF-910938-1; ON: DE91018024
• Resource Relation: Conference: International conference on high temperature aluminides and intermetallics, San Diego, CA (United States), 17-19 Sep 1991
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
OXIDATION
TITANIUM ALLOYS
TITANIUM OXIDES
SURFACE PROPERTIES
CHEMISORPTION
MASS SPECTROSCOPY
PHOTOELECTRON SPECTROSCOPY
ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
ELECTRON SPECTROSCOPY
OXIDES
OXYGEN COMPOUNDS
SEPARATION PROCESSES
SORPTION
SPECTROSCOPY
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360102* - Metals & Alloys- Structure & Phase Studies
360105 - Metals & Alloys- Corrosion & Erosion