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Which phenomenon limits oxidation coating lifetime in turbine blades at high temperatures?

A)Kirkendall diffusion causes void formation
B)Tammann's rule dictates compound formation
C)Cottrell atmosphere strengthens grain boundaries
D)Stacking fault energy increases creep rate

💡 Explanation

Fick's law explains Kirkendall diffusion, as elements diffuse at different rates, creating vacancies that coalesce into voids. Oxidation coatings degrade because void formation weakens the coating rather than embrittlement or increased plasticity given the extreme temperatures.

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