Influence of the Al–Zr–Y master alloy composition on modification effect of Al–4% Cu alloy

E. A. Popova, P. V. Kotenkov


Results of Al–4% Cu alloy modifying by experimental master alloys Al–1.04% Zr–0.70% Y and Al–1.23% Zr–0.39% Y are presented. The relation of Zr and Y atomic percents in these master alloys was 1.41 and 3.08, respectively.  The grain refinement of Al–4% Cu alloy by small (0.1–0.3%) additive compound Zr and/or Y with experimental master alloys or commercial binary one was studied. The structure of an initial alloy is characterized by the directional crystallization α-phase. With increasing the additive compounds (Zr + Y) the columnar zone decreases and  the equiaxed zone as well. When additive compounds are 0.326% (Zr + Y) only the equiaxed zone (~200 μm) takes place. But when the additive compounds Zr and Y are introduced into Al–4% Cu alloy with commercial binary master alloys, only columnar zone takes place.


 aluminum alloys, primary and secondary aluminides, cubic and tetragonal lattices, structural type, transition metals, ternary master alloys, refining grain, dispersion hardening