Abstract
The effects of yttrium(Y) additions (0, 0.05, and 0.1wt. %) and partial remelting treatment on microstructure, grain size, phase composition of Al-5wt. %Cu based alloy were investigated in the present work. The microstructure and phase composition of samples were examined by optical microscopy (OM), scanning electron microscopy (SEM), and transmission electron microscope (TEM). We demonstrate that the AlCuY phase which had hexagonal lattice structure was precipitated by adding Y. Especially, Y+ returns refines the grain size, decreases the quantity of eutectic on grain boundaries, and narrows the crystallization range. Quantitative metallography shows that the grain size is reduced to about 25μm for alloys with 0.1 wt. %Y+20wt. %R.
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