Effect of temperature and stress on high temperature creep behavior of Ni3Al-based single crystal superalloy

The creep behavior and dislocations mechanism of the Ni3Al-based single crystal alloy IC6SX with [001] orientation were investigated under the testing conditions of 1100 ​°C/137 ​MPa, 1100 ​°C/120 ​MPa and 1070 ​°C/137 ​MPa. It was observed that the temperature and stress had a significant effect on the high temperature creep life of the single crystal alloy. As the temperature was reduced from 1100 ​°C to 1070 ​°C, the creep life increased from 65.07 ​h to 313.8 ​h. As the stress was reduced to 120 ​MPa, the creep life increased to 243.3 ​h. Under the high temperature and low stress condition the dislocations entered the γ′ phase by climbing caused by the atomic diffusion, instead of slipping.