Influence of Stacking Fault Energy on Creep Mechanism of A Single Crystal Nickel-Based Superalloy Containing Re

By means of calculating stacking fault energy (SFE), measuring creep properties and contrast analysis of dislocation configuration, an investigation has been made into the influence of the stacking fault energy on the creep mechanism of the single crystal nickel-based superalloy. Results show that the alloy at 760 degrees C has a lower stacking fault energy (SFE), and the SFE of the alloy increases with the temperatures. The deformed mechanism of the alloy during creep at 760 degrees C is the cubical gamma' phase sheared by <110> super-dislocation which may be decomposed to form the configuration of (1/3)<112> super-Shockley partials dislocation plus the superlattice intrinsic stacking fault (SISF). The deformed mechanism of the alloy which possesses the higher SFE at 1070 degrees C is the screw or edge super-dislocation shearing into the rafted gamma' phase. The SFE of the alloy at 980 degrees C is intervenient between the ones of 760 degrees C and 1070 degrees C, the deformation mechanism of the alloy during creep is the rafted gamma' phase sheared by < 110 > screw and edge super-dislocations which may be decomposed into the configuration of (1/2)< 110 > partial dislocation plus APB.