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Which risk increases when rapid thermal cycling occurs in a ceramic turbine blade?

A)Increased mechanical creep at grain boundaries
B)Decreased susceptibility to fatigue cracking
C)Elevated surface oxidation barrier response
D)Enhanced thermal diffusivity via phonon transport

💡 Explanation

Rapid thermal cycling causes micro-cracks that grow by enhanced creep at the grain boundaries due to differing thermal expansion coefficients along the grain lattice, leading to failure, because increased stress concentration accelerates tertiary creep; therefore creep is selected rather than options describing more advantageous attributes.

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