Abstract
The microstructures and fatigue crack propagation (FCP) behavior of an Al-Zn-Mg-Cu alloy in T761 and retrogression and reaging (RRA) conditions were characterized by employing differential scanning calorimetry, optical microscopy, scanning electron microscopy, transmission electron microscopy, and electron backscatter diffraction. The results suggested that coarse η′ precipitates were present in T761-treated sample, while fine dispersed η′ precipitates and GP zones were uniformly distributed in RRA-treated ones. Besides, the width of precipitate-free zones (PFZs) in T761-treated sample was found to be much greater than that in RRA-treated ones. Compared with T761-treated sample, the enhanced FCP resistance of RRA-treated sample was attributed to the shearable particles in matrix and narrow PFZs.
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