By means of finite elements analysis, an investigation has been made for the directional coarsening manners and evolutional rule of γ＇ precipitates in a single crystal nickel-base superalloy with 011 orientation during tensile creep at 980℃ and 200 MPa. Results show that the von Mises stress in the matrix channel that is 45° with respect to the loading direction is larger than that in the matrix channel that is parallel to the loading direction when external loads applied along the 011 direction. The strain energy change in two kinds of matrix channel is the driving force for the γ＇ directional coarsening, the γ＇ phase developed along the 010 and 100 and perpendicular to the 001 orientations, and formed lamellar raft morphology inclined 45° angle to the tensile stress axis.
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