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The Surface Interaction of Oxygen with a Gamma Tial

Published online by Cambridge University Press:  01 January 1992

T. N. Taylor  and
M. T. Paffett
T. N. Taylor
Affiliation:
Chemical and Laser Sciences Division, Los Alamos National Laboratory Los Alamos, NM 87545
M. T. Paffett
Affiliation:
Chemical and Laser Sciences Division, Los Alamos National Laboratory Los Alamos, NM 87545
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Abstract

The composition and bonding of incipient and atmospheric oxides grown on a Ti - 47.0 A1 - 2.2 Nb alloy were examined using Auger, x-ray, and low-energy ion scattering spectroscopies. The depth distribution of various components was determined with secondary-ion mass spectroscopy (SIMS). An oxide grown on the material in air at room temperature showed advanced A1 and Ti oxide bonding states, which had very different stabilities during heating in vacuum up to 600°C. The Ti-oxygen bonding state was markedly reduced while the Al oxide was somewhat enhanced during this process. Further controlled studies at 600°C, involving oxygen adsorption at pressures below ∼. 10-6 Torr, showed an initial A1 cation surface enrichment until the detectable A1 2p peak was 90% oxidized. Further oxygen exposure gradually produced a fully oxidized Ti valence state with a pronounced enrichment of the Ti cation at the vacuum-solid interface. The results are discussed in terms of the kinetic and thermodynamic factors of the rate-limiting steps in the oxidation process.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 1019
Copyright
Copyright © Materials Research Society 1995

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References

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