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Which risk increases when a turbine blade's crystal lattice contains inclusions of foreign atoms?

A)Increased creep rate at high temperature
B)Improved fatigue resistance under cyclic loads
C)Reduced susceptibility to chemical attack
D)Enhanced thermal conductivity at blade tips

💡 Explanation

Increased creep occurs because the impurities disrupt the lattice structure, enhancing diffusion. This accelerates Coble creep at grain boundaries, therefore the blade deforms more rapidly at operational temperatures, rather than improving fatigue resistance or conductivity.

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