Low density, high strength Al-Li alloy having high toughness at elevated temperatures
US5389165A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 15, 1992 |
| Grant date | Feb 14, 1995 |
| Priority date | — |
| Expiry date | May 15, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22F1/057
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An aluminum-based alloy useful in aircraft and aerospace structures which has low density, high strength and high fracture toughness consists essentially of the following formula: EQU Cu.sub.a Li.sub.b Mg.sub.c Ag.sub.d Zr.sub.e Al.sub.bal wherein a, b, c, d, e and bal indicate the amount in wt. % of alloying components, and wherein 2.8<a<3.8, 0.80<b<1.3, 0.20<c<1.00, 0.20<d<1.00 and 0.08<e<0.40. Preferably, the copper and lithium components are controlled such that the combined copper and lithium content are kept below the solubility limit to avoid loss of fracture toughness during elevated temperature exposure. The relationship between the copper and lithium contents also should meet the following relationship: EQU Cu (wt. %)+1.5 Li (wt. %)<5.4.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.