Abstract
Mo 73.4 Si 11.2 B 8.1 Al 7.3 ultrafine eutectic–dendrite composites undergo severe oxidation at 1100 °C in dry air, being transformed completely into mullite and cristobalite. However, the net mass loss is reduced by at least ∼ 40 % during 24 h exposure upon minor Ce addition to the alloy, indicating an unusual improvement in oxidation resistance. The presence of Ce hinders mullatization, and leads to the formation of a protective Si–O-rich layer in the scale. The relationship between oxide scale composition and the oxidation kinetics has been examined.
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