Management the structure and properties of cast aluminum alloy AM4.5Kd (VAL10) by modification with fine crystalline ligatures

To management the structure, mechanical and operational properties of high-strength cast aluminum alloy АМ4.5Кд (ВАЛ10), work uses a modification method based on principle structural inheritance, using rapidly cooled (Vcool. ≥ 10^5 °С/s) fine-crystal ligatures AlTi5 AlZr10, as well chemical composition base with nanoscale size intermetallics Alα crystals. Studies have shown that introduction fine-crystalline additives into melt leads to transition from dendritic non-dendritic significant decrease in crystals solid solution, an increase its degree supersaturation. The microstructure becomes more uniform - difference between maximum minimum grains decreases. most effective reduction grain structure solution at increased cooling rates occurs when alloying ligature introduced terms pure titanium 0.05-0.15 wt. %. We must think main factor by is large number additional crystallization centers melt. After T6 heat treatment, highest strength AM4.5Kd (VAL10) achieved modified AlZr10 ligature, particular, mass fraction zirconium 0.25%. Probably, this mainly due expansion region copper during high-speed subsequent disintegration treatment release strengthening nano-sized CuAl2 Al3Zr phases. Tribological studies were carried out. fine crystal amount 12 wt.% has wear resistance. Keywords: ligatures, (VAL10), modification, microstructure, strength,