Nemak, S.a.b. De C.v.

Nemak Linz Gmbh

Michael Rafetzeder

A method for the practice-oriented, operationally reliable production of castings of an AlCu alloy which consists of Cu:, Mn:, Zr:, Fe:, Si:, Ti:, V:, remainder Al and unavoidable impurities. A melt which has been melted according to this alloy formula is kept at temperature for several hours and then mixed vigorously at least once. Thereafter, the melt is cast in portions into the respective casting which is then solution annealed at temperature for several hours. The casting is quenched from the solution anneal temperature to a maximum temperature of 300&#xb0; C., at a specified cooling rate which the casting passes through during quenching. The casting is then artificially aged for several hours at 150-300&#xb0; C. Finally, the casting is cooled to room temperature.

Method for producing complex formed castings and casting consisting of an AlCu alloy

The present invention relates to an aluminium casting alloy having (in % by weight) Cu: 6.0-8.0%, Mn: 0.3-0.055%, Zr: 0.18-0.25%, Si: 3.0-7.0%, Ti: 0.05-0.2%. Sr: up to 0.03%, V: up to 0.04%, Fe: up to 0.25%, remainder aluminium and unavoidable impurities, and a casting for a combustion engine. The aluminium casting alloy according to the invention has high mechanical properties after a longer operating duration at high temperatures and at the same time can be cast without any problems. Furthermore, the casting according to the invention has optimised mechanical properties during operation at high temperatures and at the same time can be produced in an operationally reliable manner in terms of casting technology.

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Rohr im Kremstal, Austria

Michael Rafetzeder