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 gamma ' phase below 850 degrees 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 degrees C, the a < 110 > super-dislocation did not decompose when it cut into the gamma ' phase along the {111} plane.

Automated summary

This study investigated the stacking fault energy and creep mechanism of a single-crystal nickel-based superalloy at different temperatures. The results revealed that the stacking fault energy increased with temperature and that the presence of element Ru significantly reduced the stacking fault energy compared to other elements in the alloy. The creep mechanism involved <110> super-dislocation shearing into the gamma ' phase below 850 degrees C, which could be decomposed into (a/3) <112> partial dislocations and super-lattice intrinsic stacking fault. However, above 850 degrees C, the resistance to dislocation decomposition increased, and the a <110> super-dislocation did not decompose when it cut into the gamma ' phase along the {111} plane.