γ/γ＇ interface strengthening of Re in single crystal superalloys

Based on analysis of three alloys with various Re contents, the effects of Re on the interfacial structure characteristic and interracial dislocations of γ/γ＇ in single crystal superalloys were investigated. A high resolution transition electron microscopy （I-IRTEM） technique was used to detect the structure characteristic of γ/γ＇ interface. The interfacial dislocations of γ/γ＇ were analyzed with TEM. The results show that as Re content increases, the interfaces of γ/γ＇ become orderly, the atomic arrangements at interfaces are more uniform, the number of mismatch dislocations increases and transition areas between γ, and γ＇ phases become narrow. That Re changes the interracial structure promotes the formation of dense., regular and homogeneous interfacial dislocation networks in short time during creep at 1 100 ℃ and 140 MPa, which results in strengthened γ/γ＇ interface at elevated temperature.