The creep behavior and dislocation mechanism of Ni₃Al-based single crystal alloys IC6SX with crystal orientation [001] which was prepared by seed crystal method under the testing conditions of 760 ​°C/500 ​MPa,760 ​°C/540 ​MPa and 760 ​°C/580 ​MPa were investigated. The experimental results showed that the creep properties, dislocation morphology and mechanism of this alloy were different under different stress conditions. With the stress increasing from 500 ​MPa to 580 ​MPa, the creep life decreased from more than 1000h to 32.64h. The cubic degree of γ′ phase in single crystal alloy decreased obviously and the size of γ′ phase increased. The mechanism of dislocation movement also changed with the increasing stress. It was found that after the specimen was tested under the condition of 760 ​°C/500 ​MPa the dislocation network prevented the movement of dislocations and it was difficult for dislocations to enter the γ′ phase from the γ/γ′ interface. When the stress was 540 ​MPa, the dislocations cut into the γ′ phase by stacking fault. Furthermore, with the stress increasing to 580 ​MPa, the dislocation entered the γ′ phase in the form of extended dislocation and Lomer-Cottrell dislocation.

Ni ₃的蠕变行为和位错机制在760℃/500MPa、760℃/540MPa和760℃/580MPa测试条件下采用晶种法制备的具有晶体取向[001]的铝基单晶合金IC6SX MPa 进行了研究。实验结果表明，该合金在不同应力条件下的蠕变性能、位错形貌和机理不同。随着应力从500 MPa增加到580 MPa，蠕变寿命从1000多h下降到32.64h。单晶合金中γ′相的立方度明显降低，γ′相尺寸增大。位错运动的机制也随着应力的增加而改变。试件在760℃/500MPa条件下测试后发现，位错网络阻止了位错的运动，位错很难从γ/γ′界面进入γ′相。当应力为 540 MPa 时，位错通过堆垛层错切入 γ' 相。此外，随着应力增加到 580 MPa，位错以扩展位错和 Lomer-Cottrell 位错的形式进入 γ' 相。