Structures and properties of DIN661 alloy with fine-crystalline additives

The structures and properties of DIN661 alloy with the addition of 1 wt.% of 40% La-60% Ce and with 0.3-0.4 wt.% of Al-based rapidly solidified additives together with SHS Al-Ti mater alloy were compared. Experiments were carried out under industrial conditions. The treatment with the rare earth additives resulted in considerable grain refinement but with worse mechanical properties because of the presence of large crystals of intermetallic phases, primary silicon, α-Al dendrites and greater gas porosity. Less quantities of rapidly solidified additives and SHS Al-Ti mater alloy provided refinement of these phases and better mechanical properties.