Effects of surface oxidation on vacancy defects in beta nickel-aluminum alloys

Technical Report · Tue Jan 01 00:00:00 EST 1980

DOI:https://doi.org/10.2172/5806093· OSTI ID:5806093

Parthasarathi, A.

Transmission Electron Microscopy and Auger Electron Spectroscopy have been used to make observations of the oxidation process in ..beta..-NiAl alloys annealed under controlled conditions of temperature and oxygen partial pressure. Binary Ni-Al alloys, with nominally 47.5, 50.4 and 52.5 at. % Al, were examined. The Auger spectroscopy analysis showed that the predominant oxide formed on these alloys is Al/sub 2/O/sub 3/, with a possible thin intermediate layer of spinel. Bulk oxidation experiments indicate that the oxide grows by outward diffusion of cations to the oxide/gas interface.

• Research Organization: Illinois Univ., Urbana (USA). Dept. of Metallurgy and Mining Engineering
• DOE Contract Number: AC02-76ER01198
• OSTI ID: 5806093
• Report Number(s): COO-1198-1292
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
SURFACE COATING
ALUMINIUM BASE ALLOYS
OXIDATION
NICKEL ALLOYS
ALUMINIUM ALLOYS
NICKEL BASE ALLOYS
ANIONS
CATIONS
DEFECTS
DIFFUSION
DISLOCATIONS
SURFACES
VACANCIES
VOIDS
ALLOYS
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL REACTIONS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DEPOSITION
IONS
LINE DEFECTS
OXIDES
OXYGEN COMPOUNDS
POINT DEFECTS
360105* - Metals & Alloys- Corrosion & Erosion