The effect of zirconium on the microstructure, phase composition, and mechanical properties AlCuYb AlCuGd alloys was studied. microstructure as-cast did not consist new intermetallic phases with other elements, so fully dissolved in aluminum matrix. AlCuYbZr/AlCuGdZr demonstrated higher hardness values compared to AlCuYb/AlCuGd due precipitation Al3(Zr,Yb) Al3(Zr,Gd) phases, which were formed d...