US5133931A
Expired / Lapsed
US
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Lithium aluminum alloy system
Assignee: Constellium Rolled Products Ravenswood LLC
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Filing: 1990-08-28
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Granted: 1992-07-28
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Expires: 2010-08-28
Abstract
Abstract An aluminum based alloy useful in aircraft and airframe structures which has low density and consists essentially of the following formula: Mg.sub.a Li.sub.b Zn.sub.c Ag.sub.d Al.sub.bal wherein a ranges from 0.5 to 10%, b ranges from 0.5 to 3.0%, c ranges from 0.1 to 5.0%, d ranges from 0.1 to 2.0%, and bal indicates the balance of the alloy is aluminum, with the proviso that the total amount of alloying elements cannot exceed 12.0%, with the further proviso that when a ranges from 7.0 to 10.0%, b cannot exceed 2.5% and c cannot exceed 2.0%.
Inventors
- 👤 Alex Cho
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:23
CPC Classifications
C; C22; C22C; C22C21/00; C22C21/06; C22F; C22F1/00; C22F1/04; C22F1/047
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
90 words
A low density aluminum based alloy consisting essentially of the formula Mg.sub.a Li.sub.b Zn.sub.c Ag.sub.d Al.sub.bal wherein a ranges from 0.5 to 10.0%, b ranges from 0.5 to 3.0%, c ranges from 0.1 to 5.0%, d ranges from 0.10 to 2.0%, and bal indicates that the balance of the composition is aluminum, with the proviso that the total amount of alloying elements may not exceed 12.0 wt. %, and with the further proviso that when a ranges from 7.0 to 10.0%, b cannot exceed 2.5% and c cannot exceed 2.0%.
Claim 2
Dependent Claim
90 words
A low density aluminum based alloy consisting essentially of the formula Mg.sub.a Li.sub.b Zn.sub.c Ag.sub.d Al.sub.bal wherein a ranges from 0.5 to 10.0%, b ranges from 0.5 to 3.0%, c ranges from 0.1 to 5.0%, d ranges from 0.10 to 2.0%, and bal indicates that the balance of the composition is aluminum, with the proviso that the total amount of alloying elements may not exceed 12.0 wt. %, and with the further proviso that when a ranges from 7.0 to 10.0%, b cannot exceed 2.5% and c cannot exceed 2.0%.
Claim 3
Dependent Claim
19 words
An aluminum based alloy according to claim 1 which also contains zirconium in an amount of up to 1.0%.
Claim 4
Dependent Claim
18 words
An aluminum based alloy according to claim 1 which has a density of about 0.091 lbs/in. 3 .
Claim 5
Dependent Claim
30 words
An aluminum based alloy according to claim 1 wherein a is 7.0 to 10.0%, b is 1.0 to 1.5%, c is 0.3 to 1.0% and d is 0.3 to 1.0%.
Claim 6
Dependent Claim
30 words
An aluminum based alloy according to claim 1 wherein a is 3.0 to 5.5%, b is 2.2 to 3.0%, c is 0.3 to 1.0% and d is 0.3 to 1.0%.
Claim 7
Dependent Claim
34 words
An aluminum based alloy according to claim 1 wherein a is 2.0 to 3.0%, b is 1.0 to 2.0%, c is 4.0 to 6.0%, and d is 0.3 to 1.0% with the balance aluminum.
Claim 8
Dependent Claim
40 words
A low density aluminum alloy consisting essentially of the formula Mg.sub.a Li.sub.b Zn.sub.c Ag.sub.d Zr.sub.e Al.sub.bal wherein a is 4.4, b is 1.8, c is 0.5, d is 0.3 and e is 0.14 and bal indicates the balance is aluminum.
Claim 9
Dependent Claim
40 words
A low density aluminum alloy consisting essentially of the formula Mg.sub.a Li.sub.b Zn.sub.c Ag.sub.d Zr.sub.e Al.sub.bal wherein a is 4.4, b is 1.8, c is 0.5, d is 0.3 and e is 0.14 and bal indicates the balance is aluminum.
Claim 10
Independent Claim
148 words
A method for the preparation of an aluminum alloy which comprises the following steps: a) casting an alloy ingot of the following composition: Mg.sub.a Li.sub.b Zn.sub.c Ag.sub.d Al.sub.bal wherein a ranges from 0.5 to 10.0%, b ranges from 0.5 to 3.0%, c ranges from 0.1 to 5.0%, d ranges from 0.1 to 2.0%, and bal indicates that the balance of the alloy is aluminum, with the proviso that the total amount of alloying elements cannot exceed 12.0%, with the further proviso that when a ranges from 7.0 to 10.0%, b cannot exceed 2.5% and c cannot exceed 2.0%; b) forming an ingot of said alloy; c) relieving stress in said ingot by heating; d) homogenizing by heating, soaking at an elevated temperature and cooling; e) hot rolling to final gauge; f) heat treating by soaking and then quenching; g) stretching 5 to 8%; and h) aging by heating.
Claim 11
Independent Claim
148 words
A method for the preparation of an aluminum alloy which comprises the following steps: a) casting an alloy ingot of the following composition: Mg.sub.a Li.sub.b Zn.sub.c Ag.sub.d Al.sub.bal wherein a ranges from 0.5 to 10.0%, b ranges from 0.5 to 3.0%, c ranges from 0.1 to 5.0%, d ranges from 0.1 to 2.0%, and bal indicates that the balance of the alloy is aluminum, with the proviso that the total amount of alloying elements cannot exceed 12.0%, with the further proviso that when a ranges from 7.0 to 10.0%, b cannot exceed 2.5% and c cannot exceed 2.0%; b) forming an ingot of said alloy; c) relieving stress in said ingot by heating; d) homogenizing by heating, soaking at an elevated temperature and cooling; e) hot rolling to final gauge; f) heat treating by soaking and then quenching; g) stretching 5 to 8%; and h) aging by heating.
Claim 12
Dependent Claim
12 words
An aerospace airframe structure produced from an aluminum alloy of claim 1.
Claim 13
Dependent Claim
12 words
An aerospace airframe structure produced by an aluminum alloy of claim 7.
Claim 14
Dependent Claim
12 words
An aerospace airframe structure produced from an aluminum alloy of claim 1.
Claim 15
Dependent Claim
12 words
An aerospace airframe structure produced from an aluminum alloy of claim 7.
References Cited (Backward Citations)
US2293864A
Cited
US3081534A
Cited
US3306717A
Cited
US3346370A
Cited
GB1172736A
Cited
US3773502A
Cited
US3876474A
Cited
US3984260A
Cited
US3765877A
Cited
US4094705A
Cited
US4297976A
Cited
US4409038A
Cited
US4532106A
Cited
US4434014A
Cited
US4588553A
Cited
US4594222A
Cited
GB2121822A
Cited
US4526630A
Cited
US4571272A
Cited
US4636357A
Cited
DE3346882A1
Cited
GB2134925A
Cited
US4626409A
Cited
US4582544A
Cited
US4624717A
Cited
US4584173A
Cited
US4758286A
Cited
US4603029A
Cited
US4840682A
Cited
US4735774A
Cited
US4661172A
Cited
US4752343A
Cited
US4652314A
Cited
FR2561261A1
Cited
EP0158571A1
Cited
US4897126A
Cited
US4648913A
Cited
US4844750A
Cited
US4806174A
Cited
US4690840A
Cited
US4681736A
Cited
US4635842A
Cited
US4816087A
Cited
US4915747A
Cited
US4921548A
Cited
EP0227563A1
Cited
US4832910A
Cited
US4795502A
Cited
US4790884A
Cited
US4861391A
Cited
US4869870A
Cited
US4889569A
Cited
WO1990002211A1
Cited
US4923532A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-28 | 1996-01-27 | 1996-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-28 | 2000-01-27 | 2000-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-28 | 2004-01-27 | 2004-07-28 | $7700.00 | Window Closed / Lapsed |