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Oxidation Of AI-Cu-Fe Quasicrystals

Published online by Cambridge University Press:  10 February 2011

B. I. Wehner  and
U. Köster
B. I. Wehner
Affiliation:
Dept. Chem. Eng., University of Dortmund, D-44221 Dortmund, Germany
U. Köster
Affiliation:
Dept. Chem. Eng., University of Dortmund, D-44221 Dortmund, Germany
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Abstract

The oxidation behavior of i-A163Cu25Fe12 at 800°C in air was investigated by means of TGA, XRD, SEM and TEM. In the beginning a homogeneous oxide layer is formed by the subsequent growth of metastable γ-Al2O3 and Θ-Al2O3. Nucleation of the thermodynamical stable α-Al2O3 occurs at the interface oxide/quasicrystal. The following growth of α-Al2O3 through the oxide layer leads to the formation of oxide nodules. The high growth rate of the α-Al2O3 can be explained by the incorporation of copper ions. The oxidation resistance of the quasicrystal is insufficient at high temperatures, because no protective oxide layer is formed. The high temperature oxidation behavior of Al-Cu-Fe quasicrystal and the aluminides β-FeAl and β-NiAl is compared regarding the oxidation rate, the oxide phases and the concentration changes in the material due to selective oxidation of aluminum.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 553: Symposium LL – Quasicrystals , 1998 , 269
Copyright
Copyright © Materials Research Society 1999

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References

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