The oxidation of four oxide dispersion strengthened Ni-5Al-xSi-0.2Y2O3 (x = 1, 3, 5, 7 wt.%) alloys in air at 1100 °C
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Abstract
Abstract The cyclic oxidation behavior of oxide dispersion strengthened Ni-xSi-5Al-0.2Y2O3 (with x = 1, 3, 5, 7 wt.%) superalloys was investigated at 1100 °C for 100 h. The alloys contained 5 wt.% silicon possessed the best oxidation resistance with the formation of continuous external α-alumina scales developed on the surface without any noticeable internal oxides. Therefore, the addition of silicon decreased the oxidation rate significantly and exerted the third-element effect by reducing the critical Al content needed for the transition from its internal to external oxidation. However, the excessive silicon content (7 wt.%) reduced the spallation resistance of oxide scales.
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OpenAlex topics: High-Temperature Coating Behaviors · Nuclear Materials and Properties · Advanced materials and composites
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