Process for the thermal treatment of aluminium - copper - magnes

Details Process for the thermal treatment of aluminium - copper - magnes Process for the thermal treatment of aluminium - copper - magnes

1979-08-23

1982-04-06

Dean, R.

Metal treatment

Compositions

Heat treating

148159, C22F 104

Patent

active

043233996

ABSTRACT:
A process for the thermal treatment of wrought products made of an aluminum alloy of the 2000 series comprising by weight from 3.5 to 5% copper, from 0.2 to 1% magnesium, from 0.25 to 1.2% silicon, with a Si to Mg ratio greater than 0.8 comprising solution heat treatment, quenching treatment, ageing and tempering wherein the tempering treatment comprises at least two stages: (1) a main tempering treatment at a temperature higher than 225.degree. C. and lower than 280.degree. C. lasting between 6 seconds and 60 minutes and (2) a complementary tempering treatment at a temperature between 120.degree. and 175.degree. C. lasting between 4 and 192 hours. This process allows the compromise between the mechanical tensile characteristics and the resistance to intercrystalline and stress corrosion to be improved.

REFERENCES:
patent: 3305410 (1967-02-01), Sublett et al.

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