Ni3Al-based single crystal alloy IC6SX was prepared by seed crystal method. The effect of different stress conditions on creep behavior of this alloy at 980°C was investigated. The results showed that the creep life of this alloy at 980°C decreased significantly with the increase of stress. When the stress increased from 180 MPa to 230 MPa, the creep life dropped from 245.5 h to 69.3 h, and the steady-state creep rate increased slightly but not significantly. Meanwhile, the morphology of γ phase and dislocation after creep were studied. The results showed that with the increase of stress, the density of dislocations in the γ phase increased gradually, the strength of this alloy decreased gradually, so the creep life decreased significantly. The Y-NiMo phase resolved from the γ phase decreased gradually as the creep life decreased. The creep experiment of the alloy was carried out at 980°C. Due to the higher temperature, the diffusion of atoms in this alloy became faster. Deformation was not only caused by the slippage of dislocations in the crystal but also by the diffusion of atoms. Therefore, the creep mechanism of single crystal alloy IC6SX at this temperature is a mixed mechanism of dislocation glide and diffusion.

中文翻译：

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应力对单晶合金 IC6SX 在 980°C 蠕变行为的影响

采用晶种法制备Ni3Al基单晶合金IC6SX。研究了不同应力条件对该合金在 980°C 下蠕变行为的影响。结果表明，该合金在980℃时的蠕变寿命随着应力的增加而显着降低。当应力从 180 MPa 增加到 230 MPa 时，蠕变寿命从 245.5 h 下降到 69.3 h，稳态蠕变速率略有增加，但不显着。同时，研究了蠕变后γ相和位错的形貌。结果表明，随着应力的增加，γ相中的位错密度逐渐增加，该合金的强度逐渐降低，蠕变寿命显着降低。随着蠕变寿命的减少，从γ相分解的Y-NiMo相逐渐减少。合金的蠕变实验在 980°C 下进行。由于温度较高，该合金中原子的扩散变得更快。变形不仅是由晶体中位错的滑移引起的，而且是由原子的扩散引起的。因此，该温度下单晶合金IC6SX的蠕变机制是位错滑移和扩散的混合机制。