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TCP phase of nickel-based superalloys are formed at a temperature of _______

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TCP phase of nickel-based superalloys are formed at a temperature of _______

(a) 200^oC

(b) 400^oC

(c) 600^oC

(d) > 750^oC

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This intriguing question comes from Refractory Materials, Superalloys topic in division Refractories & Dielectric Materials of Engineering Material & Metallurgy

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Correct choice is (d) > 750^oC

To elaborate: TCP refers to a Topologically Close-Packed phase in which the phases have close-packed planes. It includes several phases existing in HCP crystal structure. This phase is formed as a result of high temperature over a long period of time.

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