仅依靠实验方法难以细致表征镍基单晶高温合金服役过程中外加应力对显微组织影响的动态过程，利用计算模拟手段研究外加应力对单晶高温合金中γ'相筏化的影响具有明显优势。本工作依据外加应力类型判断γ基体内所开动的滑移系情况并计算其本征塑性应变，模拟了外加应力下镍基单晶高温合金中γ'相筏化组织的形成过程，并对镍基单晶高温合金筏化过程的微观组织演变规律进行了研究，重点考察了蠕变初期γ相通道内塑性应变对筏化组织形成的影响。结果表明，外加正应力载荷下产生的塑性应变使得γ'相沿特定方向择优生长，是发生γ'相筏化的主要原因，且晶格间错配度直接决定了其筏化类型(N型与P型)；γ'/γ界面(如{001}面)上的位错间距显著影响γ'相的形貌(长(宽)-高比)，但并不影响γ'相的生长动力学及相同演化时间步下γ'相的体积；与外加正应力不同，外加剪切应力载荷时，筏化组织的粗化方向与水平方向约呈30°或60°夹角，这与激活的滑移系密切相关。此外，不同组合的滑移系可使得γ通道发生扭折现象。

Nickel-based single crystal superalloys are critical materials for manufacturing advanced aircraft engine blades. During operation, microstructural changes in alloys under the applied stress significantly influence their fatigue and creep performances. However, relying solely on experimental methods poses challenges in capturing the dynamic processes by which the applied stress affects the alloy microstructure. Utilizing computational simulations to study the impact of the applied stress on the rafted γ' phase in single crystal superalloys offers distinct advantages. In this study, specific slip systems activated within the γ matrix are identified based on the type of the applied stress and their intrinsic plastic strain is calculated. The simulation models the formation of rafting under the applied stress and investigates the evolution of the microstructure during the rafting process in nickel-based single crystal superalloys. This study focuses on the effect of plastic strain within γ channels on the formation of the rafting morphology during the early stages of creep formation. Plastic strain generated under externally applied tensile stress promotes the preferential growth of γ′ precipitates along specific directions, which is the primary cause of γ′ phase rafting. Moreover, the lattice misfit directly determines the type of rafting (N-type or P-type). The spacing of dislocations at the γ′/γ interfaces, such as along {001} planes, significantly affects the morphology (aspect ratio) of γ′ precipitates but does not influence the growth kinetics or volume of γ′ precipitates at a given time step. In contrast to tensile stress, shear stress induces rafting microstructure coarsening at angles of approximately 30° or 60° relative to the horizontal direction, closely associated with activated slip systems. Additionally, different combinations of slip systems can result in the distortion of γ channels.