METHOD OF STRAIN-THERMAL TREATMENT OF ALUMINUM ALLOYS Russian patent published in 2005 - IPC

FIELD: methods of reinforcing treatment of aluminum alloys.

SUBSTANCE: the invention is pertaining to the methods of reinforcing treatment of aluminum alloys, in particular, to the methods of is strain-thermal treatment. The offered method provides for processes of a hot straining and aging of an aluminum alloy of Al-Zn-Mg system containing the following alloying additives: manganese, titanium, chrome, zirconium introduced either separately or in a complex in any combinations. At that after a thermal straining conduct either a straining at the temperature of 20-200°C with an extent of 25-50 % and a recrystallization annealing - at the temperature of 500-550°C within 4-8 hours with the following quenching, or a straining at the temperature of 480-520°C with a preliminary seasoning at this temperature for 30-90 minutes with an extent of straining of 20-50 % and the following chilling in water. Before the thermal straining they conduct homogenization. The thermal straining is realized at the temperature of 400-450 °C, and the seasoning process is conducted in one - or two stages. The technical result of the invention is development of a method of the combined strain-thermal treatment ensuring improvement of the plastic performances and resistance to destruction of mainly high-strength aluminum alloys at preservation of the level of their mechanical properties.

EFFECT: the invention presents a developed method of the combined strain-thermal treatment ensuring improvement of the plastic performances and resistance to destruction of mainly high-strength aluminum alloys at preservation of the level of their mechanical properties.