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基于晶体滑移理论，本文对Ｎｉ基单晶合金蠕变过程中的方向特性进行了研究。从材料的细观结构变化（筏化）规律出发，基于Ｓｃｈｍｉｄ系数、自由能下降量、晶格转动等特点，对Ｎｉ基单晶合金的蠕变滑移规律进行了分析，确信开动的滑移系为十二面体滑移系，仍满足文献［１２］提出的考虑材质劣化的双参数损伤规律，但标志材质损伤的因子Ｃ取和。利用本文理论，对国产ＤＤ３两种温度下不同取向的预测的蠕变寿命和实验结果较为一致。
Based on the theory of crystal slip, the directional characteristics in the creep process of Ni-based single crystal alloys have been studied. Based on the law of mesostructure change (raftization), the creep and slipping laws of Ni-based single crystal alloys were analyzed based on the characteristics of Schmid coefficient, free energy drop and lattice rotation, Is a dodecahedron slip system, which still satisfies the dual-parameter damage rule proposed in [12] for considering material deterioration, but the factor C for the damage of marking material is summed. Using this theory, the predicted creep lifetimes and experimental results for different orientations of domestic DD3 at two temperatures are consistent.