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The Cyclic Oxidation behavior of Oxide-Dispersed β-NiAl

Published online by Cambridge University Press:  22 February 2011

B. A. Pint  and
L. W. Hobbs
B. A. Pint
Affiliation:
H. H. Uhlig Corrosion Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139 present address: Oak Ridge National Laboratory, P. O. Box 2008, Oak Ridge, TN 37831–6156
L. W. Hobbs
Affiliation:
H. H. Uhlig Corrosion Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139
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Abstract

Short-term cyclic oxidation tests were performed at 1200°C and 1500°C on ²-NiAl with 1 vol% oxide dispersions of Y2O3, La2O3 and Al2O3. The Y2O3 addition resulted in a very adherent ±-Al2O3 scale at 1200°C, with some improvement in the scale adhesion at 1500°C, compared to an undoped ²-NiAl alloy. The La2O3 and Al2O3 additions resulted in more severe oxidation than the undoped ²-NiAl at 1200°C. Both Y and La ions are found to segregate to ±-Al2O3 scale grain boundaries using scanning transmission electron microscopy/energy dispersive x-ray analysis. However, at both 1200°C and 1500°C, the La addition appears to cause a rapid increase in the isothermal oxidation rate, leading to excessive scale spallation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 987
Copyright
Copyright © Materials Research Society 1995

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