Cold rolling for aluminum-lithium alloys
US5374321A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1993 |
| Grant date | Dec 20, 1994 |
| Priority date | — |
| Expiry date | Dec 20, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22F1/057
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This invention relates to aluminium alloys containing lithium which are particularly suitable for aerospace construction in that they possess improved cold rolling characteristics optionally with improved damage tolerance. A method of producing sheet or strip material is described which comprises the steps of: (a) providing, in a condition suitable for hot rolling, a billet of an alloy of the composition in weight percent: lithium 1.9 to 2.6; magnesium 0.4 to 1.4; copper 1.0 to 2,2; manganese 9 to 0.09; zirconium 0 to 0.25; at least one other grain-controlling element 0 to 0.5; nickel 0 to 0.5; zinc 0 to 0.5; aluminium balance (except for incidental impurities), wherein the other grain-controlling elements are selected from hafanium, niobium, scandium, cerium, chromium, titanium and vanadium, and wherein at least one of (i) manganese, (ii) zirconium and (iii) one of the said other grain controlling elements is present, (b) hot rolling the billet to produce an intermediate shape suitable for annealing, (c) annealing the said intermediate shape at a temperature sufficiently high for the intermediate shape to be softened sufficiently to be subsequently rolled, and high enough for esse…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.