Effect of temperature and stress on high temperature creep behavior of Ni3Al-based single crystal superalloy
Cheng Chang, Liwu Jiang, Meiling Wu, Shusuo Li, Yafang Han
Abstract
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.