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Single crystal turbine blades are used because

  • A.Removing grain boundaries greatly improves creep resistance
  • B.They are cheaper to manufacture
  • C.They conduct heat better
  • D.They are lighter than conventional castings

Answer: A

Grain boundaries are where creep damage accumulates at high temperature, so eliminating them raises the usable temperature substantially. The casting process is slow and expensive, which is accepted because the temperature gain translates directly into engine performance.

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