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Ismail, F. B.
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article
Alloying effects on oxidation mechanisms in polycrystalline Co–Ni base superalloys
Abstract
<p>Oxidation mechanisms in polycrystalline Co–Ni–Cr–Al–W–Ta alloys were investigated using <sub>16</sub>O/<sub>18</sub>O isotopic tracer analysis in the focused ion-beam secondary ion mass spectrometer (FIB-SIMS). It was found that Al additions favour the formation of a continuous alumina-rich layer, that Cr indirectly improved oxidation resistance and that increasing the Co fraction resulted in poorer oxidation performance. In the alloy containing 15 at.% Cr and 10 at.% Al, the outer scale formed after 200 h oxidation at 800 °C comprised oxides less than 1 μm thick. It is concluded that protective oxide scales can be formed in Co–Ni base superalloys.</p>