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Isothermal oxidation in air was carried out on a γ′-strengthened single crystalline Co–Al–W–B superalloy at 800, 900, and 1000°C. The absence of grain boundaries leads to inferior oxidation properties at 800 and 900°C, and improved properties at 1000°C, compared to a polycrystalline alloy of the same composition. At lower temperatures, grain boundary diffusion is dominant and assumed to be the reason...
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