Why are turbine blades in modern jet engines often made from single-crystal nickel-based superalloys?

(A) To eliminate grain boundaries that cause high-temperature creep and grain boundary sliding

(B) To reduce density to that of plastic

(C) To eliminate the need for any internal cooling channels

(D) Because single-crystal alloys are magnetic

Answer Key:

A

### Solution: Elimination of grain boundaries removes the primary pathways for high-temperature diffusion and grain boundary sliding, providing exceptional resistance to creep under extreme centrifugal stress and temperature. Correct: A.

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