Abstract
Due to their low density and high strength-to-weight-ratio magnesium alloys are very attractive for lightweight construction. Especially creep-resistant magnesium alloys can also be applied in the engine area of automobiles and therefore offer a high potential for weight reduction. For a safe and efficient use in such applications at elevated temperatures, a fundamental knowledge of the materials properties under cyclic loading is necessary. The aim of this study is the comparative investigation of the cyclic creep (ratcheting) behavior of magnesium alloys Mg-4Al-2Ba-2Ca and AE42 under different load ratios. Fatigue tests in tensile and compressive load ratios have been performed at room temperature. Fatigue strengths were estimated in load increase tests based on structure-sensitive material reactions. The results were correlated with fatigue lifetimes determined in constant amplitude tests. Furthermore, characteristic deterioration mechanisms were evaluated using a dedicated custom sensor system as well as by concomitant microstructural investigations.
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