In this study, the difference between in-phase (IP) and out-of-phase (OP) thermomechanical fatigue (TMF) cycling at 100-850°C of a single-crystal superalloy is investigated both from a mechanical response and resulting microstructure perspective. Results indicate that there is no significant difference in fatigue lives between IP and OP TMF when similar strain ranges and crystal orientations are considered. The deformation mechanisms occurring during IP and OP TMF are similar where the main deformation mechanism for this alloy is localized deformation bands and crack initiation is preferred to these bands. Other TMF mechanisms, such as recrystallization and oxidation, are also discussed.

在这项研究中，从机械响应和所产生的微观结构两方面研究了单晶高温合金在100-850°C时的同相（IP）和异相（OP）热机械疲劳（TMF）循环之间的差异。透视。结果表明，当考虑相似的应变范围和晶体取向时，IP和OP TMF之间的疲劳寿命没有显着差异。IP和OP TMF期间发生的变形机制相似，其中该合金的主要变形机制是局部变形带， 而裂纹萌生 优先于这些带。还讨论了其他TMF机制，例如重结晶和氧化。