Abstract
The coarsening behavior of strengthening particles has been studied in a peak-aged Al–Cu–Mg–Ag alloy during creep at 150 °C and 165 °C. The average {111}Al Ω plate thickness and diameter were observed to strongly depend on creep time and less on the applied stress levels and total plastic strain accommodated during creep. The volume fraction (FV) of Ω particles increased during long-term creep up to values exceeding that after peak-aging. The S-phase (Al2CuMg, Cmcm) fragments independently nucleate along dislocations and then intergrowth each other to form precipitate complexes together with the θ′-phase (Al2Cu, I4‾m2). The complex particle size including the θ′ plate thickness and the S rod diameter are sensitive to the total plastic strain level achieved at different applied stresses during creep.
Published Version
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