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Oxidation of Metals

, Volume 30, Issue 5–6, pp 361–390 | Cite as

Effect of 0.1 at.% zirconium on the cyclic oxidation resistance ofβ-NiAl

  • Charles A. Barrett
Article

Abstract

The effect of 0.1 at.% Zr (0.2 wt.% Zr) on the cyclic oxidation of hipped β-NiAl was studied. Oxidation testing was performed in static air at 1100–1200 °C, using 1-hr exposure cycles for test times up to 3000 hr. The weight change versus time data were modeled with the COSP computer program to analyze and predict cyclic-oxidation behavior. Zr additions significantly change the nature of the scale-spalling process during cooling so that the oxide spalls near the oxide-air interface at a relatively low depth within the scale. Without Zr, the predominantly α-Al2O3 scale tends to spall randomly to bare metal at relatively high effective-scale-loss rates, particularly at 1150°C and 1200°C. This leads to higher rates of Al consumption for the Zr-free aluminide and much earlier depletion of Al, leading to eventual breakaway (i.e., failure).

Key words

cyclic oxidation β-nickel aluminide zirconium effect scale spalling computer modeling 

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Copyright information

© Plenum Publishing Corporation 1988

Authors and Affiliations

  • Charles A. Barrett
    • 1
  1. 1.Lewis Research CenterNational Aeronautics and Space AdministrationCleveland

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