Abstract
The association between small Sc addition and different precipitates in an AlCuMgAg alloy is investigated in the present work to explain the Sc-dependent microstructural evolution during extended aging at 180 °C. The age-hardening capacity and the strength properties of AlCuMgAg alloy are found to be degraded by 0.32 wt% Sc addition. This negative effect of Sc is directly associated with the formation of Al8Cu4Sc intermetallics, which consumes the available Cu solutes for Ω precipitation and hence contributes to the slower Ω nucleation and resultant lower plate number density. Addition of 0.32 wt% Sc to the studied AlCuMgAg alloy also facilitates the rapid growth of S precipitates and induces a rapid lengthening of Ω phase during extended aging. In addition, no distinct grain refinement can be observed with 0.32 wt% Sc addition.
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