Abstract
Secondary cracks were frequently reported in fatigue failure of aviation aluminum alloy. In present study, scanning electron microscope observation of fracture morphology was carried out on an Al-Zn-Mg-Cu alloy extrusion plate with high zinc content. Secondary cracks penetrated continuous dimples formed via a chain of discontinuously distributed Fe-rich particles. Secondary cracks showed deflections inside or between dimples and could branch and then coalesce in neighbor dimples, or the branch just arrested without further growth, which were beneficial to energy release during fatigue crack propagation.
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