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Which crystal structure is the Gamma Double Prime phase of nickel-based superalloy composed of?

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Which crystal structure is the Gamma Double Prime phase of nickel-based superalloy composed of?

(a) FCC

(b) BCC

(c) BCT

(d) HCP

The question was posed to me by my college professor while I was bunking the class.

My question is from Refractory Materials, Superalloys topic in division Refractories & Dielectric Materials of Engineering Material & Metallurgy

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Best answer
The correct option is (c) BCT

Easy explanation: Gamma Double Prime is a phase of nickel-based superalloys which are used to strengthen the alloys at temperatures lower than 650oC. It consists of a body-centered tetragonal (BCT) crystal structure having a composition of Ni3Nb or Ni3V.

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