Process for thermal treatment of thin 7000 series aluminum alloys and products obtained
US4189334A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 1978 |
| Grant date | Feb 19, 1980 |
| Priority date | — |
| Expiry date | Oct 26, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22F1/053
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for the thermal treatment of thin products made of 7000 series aluminum alloys comprising a solution heat treatment, quenching treatment and a tempering treatment in three stages: PA1 pretempering between 100.degree. and 150.degree. C. for 5 minutes to 24 hours; PA1 intermediate tempering; and, PA1 final tempering between 100.degree. and 160.degree. C. for 2 to 48 hours. Intermediate tempering comprises a rapid rise in temperature to 190.degree. C. followed by a treatment at a temperature .theta.(t) between 190.degree. and 250.degree. C. for a total duration T in such a way that the function: ##EQU1## is comprised between 0.5 and 1.5; and T and t being expressed in seconds and .theta.(t) in .degree.K. This tempering treatment imparts to the products treated both high mechanical characteristics and a high resistance to stress corrosion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.