Abstract
The fatigue properties of the Al-alloys 6013 T6 and Al-Mg-Sc were compared under constant amplitude loading conditions. The fatigue strength as well as the nucleation and propagation behavior of self-initiated microcracks was determined at R = -1 in air and NaCI solution. Variations of the test frequency on the fatigue macrocrack propagation behavior were studied at R = 0.1 in NaCl solution. The results can be explained mainly with the microstructural differences between both alloys. The extremely fine grained AlMgSc alloy exhibited a higher resistance against fatigue crack nucleation despite the lower yield stress in comparison to the coarse grained alloy 6013 T6. The microcrack propagation resistance was also higher for AlMgSc, while the macrocrack propagation resistance in the low ΔK regime was inferior as compared to 6013.
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