Negative influence of rafted γ′ phases on 750 °C/750 MPa creep in a Ni-based single crystal superalloy with 4% Re addition

Microstructure Evolution and Dislocation Mechanism of a Third-Generation Single-Crystal Ni-Based Superalloy during Creep at 1170 °C

“…The angle between the σ phase and the γ′ phase is approximately 45°, as depicted in Figure 3 b,c. The reported orientation relationship between the σ phase and the γ phase is [ 24 ]. The habit plane for the precipitation of the σ phase is the {111} planes of the γ matrix, coinciding with the slipping planes of dislocations within the γ matrix.…”

“…When the dislocations shear, bypass, and climb over the γ′ phase, they are influenced by the microstructure degradation [ 23 ]. This microstructural degradation leads to reduced resistance to creep and a decreased creep lifetime [ 24 , 25 ]. However, the addition of rhenium (Re) can significantly impede the growth of the γ′ phase and contribute to microstructural stability [ 26 ].…”