Dislocation motion during high-temperature low-stress creep in Ru-free and Ru-containing single-crystal superalloys

Creep deformation of the two experimental single crystal superalloys at high-temperature low-stress (1140 °C/137 MPa) has been analyzed through transmission electron microscopy. Emphasis is placed on elucidating the dependence of dislocation motion on microstructural evolution. The detailed analysis demonstrated that the stacking fault energy of the null γ null matrix significantly decreased with the addition of Ruthenium (Ru). The stacking...