Abstract
The thermal cycle fatigue behaviors of a single crystal Ni3Al base alloy named as IC6SX have been investigated under the test condition of 1000←→15°C. The experimental results showed that the thermal fatigue resistance of the transversal specimens of the alloy was superior to that of the longitudinal specimens. The cracks of the specimens propagated along the interdendritic region more easily than the dendrite, and might pass through the dendrite due to the accumulation of the thermal strain. Optical Microscopy (OM) and Electron Probe X-ray Microanalysis (EPXM) were adopted to observe the crack growth and the microstructural evolution, and composition near the fatigue crack, respectively. The mechanism of the thermal fatigue damage of the alloy was discussed.
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