High-cycle fatigue failure behavior of nickel-based single crystal alloys with different deviation angles in a high-temperature environment

The high-cycle fatigue failure behavior of nickel-based single crystal alloys with different deviation angles (deviated [001] orientations of 0 & DEG;, 10 & DEG;, and 20 & DEG;) was assessed in this work. At 980 & DEG;C/600 MPa, the fatigue life decreases with increasing deviation angle from the [001] orientation.The dislocation motion is mainly Orowan deformation mechanism, and the fatigue mode is crystallographic fracture. At 980 & DEG;C/640 MPa, the fatigue life is the longest when the deviation angle is 0 & DEG;, and it is the shortest when the deviation angle is 10 & DEG;. The fatigue failure mode is the crystallographic fracture when the deviation angle is 0 & DEG; and 20 & DEG;, and it is the noncrystallographic fracture when the deviation angle is 10 & DEG;. The dislocation motion is mainly a single dislocation or paired dislocation shearing & gamma;' phase deformation mechanism.

Automated summary

The high-cycle fatigue failure behavior of nickel-based single crystal alloys with different deviation angles was investigated. The fatigue life decreases as the deviation angle from the [001] orientation increases at 980°C/600 MPa. The fatigue mode is crystallographic fracture, and the dislocation motion is mainly Orowan deformation mechanism. At 980°C/640 MPa, the fatigue life is the longest when the deviation angle is 0° and the shortest when it is 10°. The fatigue failure mode is crystallographic fracture at 0° and 20°, and noncrystallographic fracture at 10°. The dislocation motion is mainly a single dislocation or paired dislocation shearing γ' phase deformation mechanism.