Abstract
This study investigates the effects of multi-scale second phases on micro-crack initiation and propagation in an Al–Zn–Mg–Cu alloy through in-situ observations using transmission electron microscopy (TEM) and a coupled in-situ stretching device. The results demonstrate that the fracture modes of the alloy are mainly intergranular with a minor amount of transcrystalline fracture. Furthermore, the size and location of the second phase significantly influence the micro-crack initiation and propagation. Submicron-sized MgZn2 particles located along the grain boundaries mostly induce micro-crack initiation through interface debonding or self-rupture, while those in the grain interior improve fracture strength and reduce the crack propagation rate of the alloy. In addition, the nano-sized Al3Zr, η′, and η phases are cut by dislocations and enhance crack propagation resistance, although their effect on the propagation path is limited. These findings provide theoretical implications for optimizing the chemical composition, mechanical properties, and fatigue resistance of Al–Zn–Mg–Cu alloys.
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