Aluminum-lithium alloy and method of investment casting an aluminum-lithium alloy
US4842822A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1986 |
| Grant date | Jun 27, 1989 |
| Priority date | — |
| Expiry date | Dec 19, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C21/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Aluminum-lithium alloy and method of investment casting an aluminum-lithium alloy including the steps of providing an aluminum-lithium alloy melt having a composition consisting essentially of about 2.0 to about 2.8 w/o lithium, about 1.2 to about 1.8 w/o copper provided that the combined lithium and copper content does not exceed 4.0 w/o, about 0.8 to about 1.0 w/o magnesium, the balance essentially aluminum, adding an effective amount of a grain refining agent to the aluminum-lithium alloy melt investment casting the melt, solution heat treating the aluminum-lithium alloy investment casting for up to 30 hours at continuously increasing temperatures to within approximately 30.degree. to 40.degree. F. of the solidus temperature of said aluminum-lithium alloy, and aging the aluminum-lithium alloy investment casting at a temperature and for a time sufficient to optimize the .delta.' precipitate size.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.