Process for the manufacture of aluminum sheets

US5292386A · kind A · utility

Assignees

• Hoogovens Aluminium N.V. · NL
• Duetsche Forschungsanstalt fur Luft und Raumfahrt DLR · DE

Inventors

• Werner Schelb · Remchingen, DE
• Manfred Peters · Bad Schwartau, DE
• Karl Welpmann · Neunburg vorm Wald, DE

Key dates

• Filing date: Apr 22, 1992
• Grant date: Mar 8, 1994
• Expiry date: Apr 22, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22F1/04
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

In order to achieve damage-tolerant properties and sufficient isotropy of aluminum alloys, particularly of type AlLi 8090, subsequent especially to hot-forming of a bar of said aluminum alloy there is interposed a solution heat treatment and quenching, followed by working and subsequent intermediate annealing within a temperature range of from 250.degree. to 475.degree. C. for a period of from 1 to 85 hours. The intermediate annealing is followed by cold forming and subsequent solution heat treatment with the additional purpose of recrystallization, whereupon the recrystallized material is especially cold-formed to a degree of deformation of only up to 8%. Thereafter the sheets having a sheet thickness of from 0.5 to 10 mm are subjected to artificial aging.