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Interfacial Reactions of Ti-24Al-11Nb Alloy with Al2O3

Published online by Cambridge University Press:  21 February 2011

Weimin Si ,
Pengxing Li  and
Renjie Wu
Weimin Si
Affiliation:
State University of New York at Stony Brook, Department of Materials Science and Engineering, Stony Brook, NY 11794-2275
Pengxing Li
Affiliation:
Shanghai Jiao Tong University, Department of Materials Science, Shanghai 200030, P.R. China
Renjie Wu
Affiliation:
Shanghai Jiao Tong University, Department of Materials Science, Shanghai 200030, P.R. China
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Abstract

The interfacial reactions and interdiffusion between Al2O3 and Ti-24Al-11Nb (at%) alloy have been investigated. Diffusion couples were fabricated by thermal sprayed Al2O3 film onto Ti-24Al-11Nb substrate, and then annealed at 1200°C. Interfacial layers were characterized using electron probe microanalysis (EPMA), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The layered structure of interface region was observed which showed the diffusion controlled characteristics. In the reaction zones, the reaction products consisted mainly of TiO, TiO2, and Al2TiO5. Adjacent to the reaction zones, there existed β phase free zone and β phase lacking zone. The β phase free zone resulted from Nb depletion of this region. The reaction mechanism has been discussed using thermodynamic approach.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 318: Symposium Ca – Interface Control of Electrical, Chemical, and Mechanical Properties , 1993 , 545
Copyright
Copyright © Materials Research Society 1994

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References

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