Abstract
2524-T3 aluminum alloy sheets with different grain sizes (13μm, 59μm, 178μm, 355μm, 126μm, and 87μm) were prepared using methods such as rolling and annealing. The microstructures and mechanical properties of the 2524-T3 aluminum alloy sheets were studied using optical microscopy (OM), scanning electron microscopy (SEM), and tensile and fatigue crack growth (FCG) rate tests. The grain size had a significant effect on the fatigue crack growth (FCG) rate. Alloys with grain sizes between 50 and 100μm exhibited high fatigue crack propagation resistances and the lowest FCG rates (da/dN=1.05–1.45×10−3mm/cycle at ΔK=30MPam1/2). Microstructural observations revealed that fatigue cracks propagated more tortuously in the alloy with grain sizes within the range of 50–100μm. This result is attributed to the combined effects of grain boundaries, crack deflection, fracture surface roughness-induced crack closure, and plasticity-induced crack closure.
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