In recent years, attempts have been made to improve the thermal efficiency of engines by applying an anodic oxide coating (anodized aluminium layer) to Aluminium (Al) alloy parts used in automobile engines. The Al alloy parts are subjected to a severe operating environment, where they are repeatedly exposed to thermal and mechanical loads. To ensure the strength reliability of such parts, it is necessary to evaluate the fatigue resistance of Al alloys considering the presence of an anodized Al layer. In this study, we attempted to evaluate the effect of an anodic oxide layer on the fatigue life of Al alloys by conducting low-cycle fatigue tests at high temperatures on Al alloy specimens with and without an anodized Al layer. As a result, it was confirmed that the anodic oxide layer extended the fatigue life of Al alloys in the temperature range above 673 K.
FUKUCHI et al. (Wed,) studied this question.