Abstract
Rare-earth elements in Ni-based single-crystal superalloys are easily lost during the casting process. The effects of incorporating Ca on the loss of Y from an Ni-based superalloy and the cyclic oxidation of this alloy have been investigated. The addition of Ca increases the Y content from 10.87 to 72.78 ppm, which has been rationalized by thermodynamic calculation of the Gibbs free energy. Ca also reduces the falling off of the protective oxide film of Y-containing Ni-based alloy and enhances the cyclic oxidation performance.
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