METHOD FOR PRODUCING CASTINGS OF COMPLEX SHAPE AND CASTING FROM ALCU ALLOY Russian patent published in 2018 - IPC C22C21/12 

FIELD: technological processes.

SUBSTANCE: invention relates to the foundry. Method includes making castings from an aluminum-copper alloy containing 6–8 % Cu, 0.3–0.55 % Mn, 0.15–0.25 % Zr, up to 0.25 % Fe, up to 0.125 % Si, 0.05–0.2 % Ti, up to 0.04 % V, balance is aluminium and unavoidable impurities. Melt, prepared in accordance with the instruction on fusion, is kept at 730–810 °C for 4–12 hours and then intensively mixed at least once. After that, the melt is poured portionwise to obtain a suitable casting, which is then subjected to diffusion annealing at 475–545 °C for 1–16 hours. From the diffusion annealing temperature, the casting is cooled to a temperature not exceeding 300 °C, and in the temperature range from 500 to 300 °C, which is traversed during cooling, the cooling rate is 0.75–15 K/s. Casting is then kept in a hot state for 1 to 10 hours at 150–300 °C. and cooled to room temperature.

EFFECT: method for obtaining castings of complex shapes is proposed.

14 cl, 3 tbl