Process for the thermal treatment of aluminium - copper - magnesium - silicon alloys
US4323399A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 1979 |
| Grant date | Apr 6, 1982 |
| Priority date | — |
| Expiry date | Aug 23, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22F1/057
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.