METHOD FOR PRODUCING COMPLEX FORMED CASTINGS AND CASTING CONSISTING OF AN AICu ALLOY

A method for producing complex formed castings comprising the following working steps:

• a) melting an AlCu alloy which consists of (in % by weight)
• Cu:
• 6-8%,
• Mn:
• 0.3-0.55%,
• Zr:
• 0.15-0.25%,
• Fe:
• up to 0.25%,
• Si:
• up to 0.125%,
• Ti:
• 0.05-0.2%,
• V:
• up to 0.04%,
• remainder Al and unavoidable impurities;
• b) keeping the melt at a holding temperature of 730-810° C. for a holding period of 4-12 hours;
• c) mixing of the melt;
• d) removing a portion of melt from the melt;
• e) casting of the portion of melt removed from the melt into the casting;
• f) solution annealing of the casting at a solution annealing temperature of 475-545° C. for a solution annealing period of 1-16 hours;
• g) quenching of the casting from the solution annealing temperature to a maximum quenching stop temperature of 300° C., wherein the casting is quenched at least within a temperature range of 500 300° C. at a cooling rate of 0.75-15 K/s;
• h) artificial ageing of the casting, wherein during artificial ageing the casting is kept at an artificial ageing temperature of 150-300° C. for a period of 1-10 hours;
• i) cooling of the casting to room temperature.