Effects of element Re on creep behavior were examined by means of measuring creep curves and microstructural observation of the single crystal superalloy containing Re or Re-free.The results indicate that high temperature creep resistance of the single crystal alloy can be greatly improved with Re addition.Compared with those of the alloy containing Re-free

the creep activation energy and stress exponent of the alloy containing 2% Re element during steady creep process can reach up to 478.6kJ/mol and 5.1

respectively

showing a distinct increase in creep lifetimes at high temperature under the condition of low stress.<110>dislocation slipping during initial creep was activated in the matrix channel to form dislocation net-like structure on γ/γ’ phase interface by dislocation reaction among moved dislocations

which is responsible for the improvement of creep resistance of the single crystal alloy

while <110> super-dislocation during completed creep is sheared into the rafted γ’ phase.