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Study of Intermetallic FeAl—Alumina Wettability Affected by Microalloying Y and Nb

Published online by Cambridge University Press:  01 January 1992

Dong Xu
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, P. R. China
Dening Wang
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, P. R. China
Weimin Zhou
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, P. R. China
Hong Yang
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, P. R. China
Dongliang Lin
Affiliation:
Department of Materials Science, Shanghai Jiao Tong University, Shanghai 200030, P. R. China
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Abstract

The effects of microalloying elements, Y(0.02at%, 0.04at% and 0.06at%) and Nb(0.2at%, 0.5at% and 0.8at%) on the wettability of intermetallic Fe-40A1 with polycrystalline α-Al2O3 were investigated experimentally by means of sessile drop method. The addition of 0.02at%Y and 0.04at%Y showed no significant effects on the wettability. However, the addition of 0.06at%Y improved the wettability in temperature range from 1673K to 1823K. The addition of different amount of Nb were not beneficial to the FeAl-Al2O3 wettability under conditions investigated. The SEM study of the shear fractured surfaces showed that the additions of Y and Nb coursed Al2O3 particles more adherent to FeAl matrix, compared with the case of pure Fe-40A1. The degree of adherence varied with the amount of Y and Nb. These phenomena are discussed in terms of interfacial reactions and interfacial bonding.

Type
Research Article
Copyright
Copyright © Materials Research Society 1995

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References

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