Abstract
Nano-precipitates at the two-stage hardening peaks of an Al-5.0Cu-0.4 Mg (wt%) alloy under isothermal aging at 210 °C were thoroughly characterized using aberration-corrected scanning transmission electron microscopy and first-principles energetics calculations. It was observed, for the first time, that individual one-dimensional GPB1 units can form with a high number density in the matrix, due to the stabilization of substitutional defects. The GPII zones at the early-stage peak aging, as well as the θ′ nano-precipitates at the second-stage peak aging, are also frequently found to be defective in structure. Further analyses suggest that the high-temperature age hardening involves a complex association and evolution of the defective GP-zones.
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