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

In which temperature range is Gamma Prime phase of nickel-based superalloys unstable? Correct Answer 600-850oC

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 600-850oC due to which a transformation from FCC structure into HCP occurs.
Bissoy MCQ

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