Abstract
In the present study, a textbook binary model alloy Al-3Cu (wt.%) was chosen as base alloy and micro-alloying effect with different Er and Zr contents was examined. A two-steps homogenization regime was optimized as 450°C/3 h + 490°C/20 h. The precipitation and recrystallization behaviors are characterized using transmission electron microscopy (TEM) and electron backscattered diffraction (EBSD) techniques. It is found that recrystallization behavior at 500°C was fully inhibited with co-additions of Er and Zr. Heterogeneous nucleation of refined θ′ phases on core-shell Al3(Er,Zr) dispersoids was firstly observed. In addition, strengthening contribution from the L12 dispersoids and precipitates were detailed discussed. The refinement of θ′ to 96.6 nm (average diameter) in Al-Cu-Er-Zr can compensate the reduction of nucleation driving force due to the loss of Cu solute atoms resulted from Al8Cu4Er primary phase.
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