Stacking fault energy and creep mechanism of a single-crystal nickel-based superalloy

The stacking fault energy and creep mechanism of a single-crystal nickel-based superalloy at different temperatures were studied. The results showed that the stacking fault energy increased with the increase in temperature, and element Ru greatly reduced the stacking fault energy compared with other elements in the alloy. The creep mechanism of the alloy was a 〈110〉 super-dislocation shearing into the γ′ phase below 850°C, and the super-dislocation could be decomposed into the configuration of (a/3) 〈112〉 partial dislocations plus super-lattice intrinsic stacking fault. The resistance of the dislocation decomposition increased during creep above 850°C, the a 〈110〉 super-dislocation did not decompose when it cut into the γ′ phase along the {111} plane.