US4603029A
Expired / Lapsed
US
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Aluminum-lithium alloy
Assignee: Boeing Co
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Filing: 1985-03-13
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Granted: 1986-07-29
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Expires: 2005-03-13
Abstract
Abstract An aluminum-lithium alloy exhibiting good fracture toughness and relatively high strength has a nominal composition of 2.5 percent lithium, 0.6 percent magnesium, 1.8 percent copper, 0.12 percent zirconium with the balance being aluminum and trace elements.
Inventors
- 👤 William E. Quist
- 👤 R. Eugene Curtis
- 👤 G. Hari Narayanan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:04
CPC Classifications
C; C22; C22C; C22C21/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
46 words
An aluminum-lithium alloy exhibiting good fracture toughness consisting essentially of ______________________________________
Element Amount (wt. %)
______________________________________
Li 2.2 to 2.8
Mg 0.3 to 0.9
Cu 1.55 to 2.1
Zr 0.08 to 0.15
Fe 0.15 max
Si 0.12 max
Other trace 0.25 max
elements
Al Balance.
______________________________________
Claim 2
Dependent Claim
46 words
An aluminum-lithium alloy exhibiting good fracture toughness consisting essentially of ______________________________________
Element Amount (wt. %)
______________________________________
Li 2.2 to 2.8
Mg 0.3 to 0.9
Cu 1.55 to 2.1
Zr 0.08 to 0.15
Fe 0.15 max
Si 0.12 max
Other trace 0.25 max
elements
Al Balance.
______________________________________
Claim 3
Dependent Claim
19 words
The alloy of claim 1 wherein said zirconium is present in amounts from about 0.10 to about 0.14 percent.
Claim 4
Dependent Claim
19 words
The alloy of claim 1 wherein said magnesium is present in amounts from about 0.4 to about 0.8 percent.
Claim 5
Dependent Claim
23 words
The alloy of claim 1 having a nominal composition of 2.5 percent lithium, 0.6 percent magnesium, 1.8 percent copper, and 0.12 percent zirconium.
Claim 6
Dependent Claim
21 words
The alloy of claim 1 wherein said alloy has been aged at a relatively low temperature for a relatively long time.
Claim 7
Dependent Claim
24 words
The alloy of claim 1 wherein said alloy has been aged at a temperature in the range of from 200° F. to 300° F.
Claim 8
Dependent Claim
19 words
The alloy of claim 6 wherein said alloy has been aged for a period of at least one hour.
Claim 9
Dependent Claim
19 words
The alloy of claim 1 wherein said alloy has been aged at a temperature of less than 275° F.
Claim 10
Dependent Claim
16 words
The alloy of claim 8 wherein said alloy has been aged for at least two hours.
Claim 11
Dependent Claim
20 words
The alloy of claim 1 wherein said alloy has been aged at a temperature of 250° F. to 275° F.
Claim 12
Dependent Claim
16 words
The alloy of claim 10 wherein said alloy has been aged for at least four hours.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-28 | 1990-01-27 | 1990-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-28 | 1994-01-27 | 1994-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-28 | 1998-01-27 | 1998-07-29 | $7700.00 | Window Closed / Lapsed |