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Oxidation and Protection of Ti3AL-Based Intermetallic Alloys

Published online by Cambridge University Press:  01 January 1992

Douglas W. Mckee
Douglas W. Mckee*
Affiliation:
General Electric Corporate Research and Development, P.O. Box 8, Schenectady, New York 12301.
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Abstract

Titanium aluminides containing 20-30 atom percent Al can suffer from severe subsurface embrittlement (alpha-case) when exposed to air at elevated temperatures for extended periods. For example.the alloys Ti-24Al-12.5Nb-l.5Mo and Ti-24Al-8Nb-2Mo-2Ta (based on the Ti3Al alpha-2 intermetallic compound) embrittle to a depth of about 80 microns during 1000 hours exposure to air at 815°C (1500°F), resulting in major reductions in tensile properties. Plasma-sprayed coatings of the MCrAlY and MCr types deposited over a thin diffusion barrier of chromium or tungsten, have been found effective in protecting these alloys against oxidation and embrittlement at this temperatures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 953
Copyright
Copyright © Materials Research Society 1995

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