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The oxidation resistance of nickel based superalloys is strongly dependent on the composition and adherence of the oxide scale formed during exposure to an oxidizing environment. Cyclic oxidation testing was conducted on advanced nickel based superalloy single crystal test bars, modified with additions of elemental yttrium. A significant improvement in the oxidation resistance of the single crystal test bars was achieved with yttrium additions greater than 200 ppm. The retained yttrium content of the test bars was directly related to the concentration of yttrium added. These results can be explained based on the interactions of yttrium and sulfur at the oxide/alloy interface as well as sulfur being tied up as innocuous compounds in the alloy.

The Effects of Yttrium and Sulfur on the Oxidation Resistance of an Advanced Single Crystal Nickel Based Superalloy