The present work has shown that the addition of Mg in superalloy can significantly influence its creep crack growth. The creep crack growth could be divided into four stages. An optimum addition of Mg to superalloys can prolong the initial stage of creep crack growth, decrease the crack growth rate and prolong the creep rupture lives. The optimum amount of Mg addition can also increase the transient point of crack growth C* in lodga/dt-log C* curve.

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