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In which temperature range is Gamma Prime phase of nickel-based superalloys unstable?

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in Engineering Material & Metallurgy by (773k points)
In which temperature range is Gamma Prime phase of nickel-based superalloys unstable?

(a) 100-200^oC

(b) 200-400^oC

(c) 600-850^oC

(d) 850-1000^oC

This question was addressed to me in examination.

The above asked question is from Refractory Materials, Superalloys topic in chapter Refractories & Dielectric Materials of Engineering Material & Metallurgy

1 Answer

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by (1.3m points)
The correct answer is (c) 600-850^oC

To elaborate: The Gamma Prime phase of nickel-based superalloys is used to strengthen the alloys at temperatures lower than 650oC. It is an intermetallic phase consisting of an FCC crystal structure. They are unstable between 600-850^oC due to which a transformation from FCC structure into HCP occurs.

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