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In this study, intermittent creep‐fatigue tests were applied on Ni‐based Alloy 617 and Alloy 625. Scanning electron microscope (SEM) observation and electron back‐scatter diffraction (EBSD) analysis were employed to the evaluation of the degradation of the crystallinity under the creep‐fatigue loads. It was found that the initial damage under creep‐fatigue load basically appeared as intergranular...