Abstract
Yttrium ion implantation significantly improves the oxidation resistance of a Co-25Cr1Al alloy by the incorporation of this reactive element in the scale. Segregation of yttrium ions to grain boundaries in the Cr 2O 3 scale has been measured using energy dispersive X-ray analysis with scanning transmission electron microscopy. Second-phase particles rich in yttrium were also detected in the scale. The effect of the yttrium segregation to oxide grain boundaries on the rate and mechanism of oxidation as well as on the scale microstructure and its adhesion to the substrate is discussed.
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