Effects of Surface Oxidation on Vacancy Defects in Beta Nickel-Aluminum Alloys

Transmission Electron Microscopy and Auger Electron Spectroscopy has 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(,2)O(,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.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Metallurgical Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2014

Author dc:creator

• Parthasarathi, Arvind

• Engineering, Metallurgy

Language dc:language

eng

Identifier

(UMI)AAI8018197

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/68643