Aluminum-lithium, aluminum-magnesium and magnesuim-lithium alloys of high toughness
US5676773A · kind A · utility
1Cited by
1References
18Claims
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Key dates
| Filing date | Jun 7, 1995 |
| Grant date | Oct 14, 1997 |
| Priority date | — |
| Expiry date | Jun 7, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C21/06
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Aluminum-based products are disclosed which contain 0.5 to 4.5 wt % lithium and which further contain no more than 1 ppm of each of the alkali metal impurity elements sodium, potassium, rubidium, and cesium. The products are capable of being aged to a peak-aged condition at which they have a grain boundary region substantially free of liquid phase eutectics comprised of sodium and potassium that form embrittlement phases at room temperature, and have a higher fracture toughness than a similar product containing more than 5 ppm in total of the alkali metal impurity elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.