Al-base alloys containing lithium, copper and magnesium and method
US4752343A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 1985 |
| Grant date | Jun 21, 1988 |
| Priority date | — |
| Expiry date | Mar 11, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C21/16
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention relates to Al-base alloys essentially containing Li, Cu and Mg, and having high specific characteristics and a high degree of ductility. Their composition is as follows (% by weight): ______________________________________ Li 1.7 to 2.9 Cu 1.5 to 3.4 ##STR1## Mg 1.2 to 2.7 Fe .ltoreq. 0.20 Si .ltoreq. 0.06 Cr 0 to 0.3 Mn 0 to 1.0 Zr 0 to 0.2 Ti 0 to 0.1 Be 0 to 0.01 Other elements (impurities) each .ltoreq. 0.05 total .ltoreq. 0.15 balance: Al ______________________________________ The heat treatment comprises a homogenization step at about .theta.(.degree.C.)=535-5 (% Mg) which practically dissolves the compounds Al-Cu (Li-Mg); a solution treatment at between .theta.+10.degree. C.; a quenching step; and a tempering step at from 170.degree. to 220.degree. C. for a period ranging from 8 to 48 hours. The mechanical strength and ductility characteristics obtained are equivalent to those of conventional alloys 2000 or 7000.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.