Comparison of low-cycle fatigue behaviors between two nickel-based single-crystal superalloys

The deformation mechanisms of nickel-base single-crystal superalloys containing 3 wt.% Re (3Re) and without Re (0Re) were systematically investigated in the temperature range from room temperature to 900 °C. At all testing temperatures, the alloy 3Re showed higher stress amplitudes and longer fatigue lives. With increasing temperature, slip mode gradually changes from planar to wavy slip. Dislocation climb and cross-slip, even by-passing became...