Abstract
Nickel-based superalloys are widely used in aircraft engines and land-based gas turbines due to their high yield strength and good creep resistance. Co in nickel-based superalloys can not only reduce the solubility of Al and Ti in the matrix and increase the content of the γ′ phase in the alloy but also reduce the stacking fault energy, which is of great significance in improving the creep and stress rupture properties. The effects of Co on the micro-structure and strengthening mechanism of nickel-based superalloys are briefly summarized in this paper, and the effects of Co on the creep and stress rupture properties are reviewed from the perspectives of stable stacking faults, mismatch, volume fractions of γ′ phases, dislocation networks, antiphase boundaries and γ channels.
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