EP0150456A2
Expired / Lapsed
EP
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Low temperature underaging of lithium bearing aluminum alloy
Assignee: Boeing Co
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Filing: 1984-12-20
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Granted: —
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Expires: 2004-12-20
Abstract
Abstract The combination of strength and fracture toughness, properties of aluminium-lithium alloys are significantly enhanced by underaging the alloys at temperatures ranging from 200°F to 300°F for relatively long periods of time.
Inventors
- 👤 R. Eugene Curtis
- 👤 G. Hari Narayanan
- 👤 William E. Quist
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 15:16
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/04; C22C; C22C21/00
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
52 words
A process for improving the relative strength and fracture toughness of an aluminum alloy containing lithium as an alloying element, said alloy first being formed into an article, solution heat treated and quenched, said process comprising the step of aging said alloy at a relatively low temperature for a relatively long time.
Claim 2
Dependent Claim
52 words
A process for improving the relative strength and fracture toughness of an aluminum alloy containing lithium as an alloying element, said alloy first being formed into an article, solution heat treated and quenched, said process comprising the step of aging said alloy at a relatively low temperature for a relatively long time.
Claim 3
Dependent Claim
21 words
The process of Claim 1 wherein said temperature is in the range of from about 200° F to about 300° F.
Claim 4
Dependent Claim
18 words
The process of Claim 2 wherein said alloy is aged for a period of at least 1 hour.
Claim 5
Dependent Claim
14 words
The process of Claim 2 wherein said temperature is less than about 275° F.
Claim 6
Dependent Claim
15 words
The process of Claim 4 wherein said alloy is aged at least about 2 hours.
Claim 7
Dependent Claim
14 words
The process of Claim 2 wherein said temperature is less than about 250° F.
Claim 8
Dependent Claim
16 words
The process of Claim 6 wherein said alloy is aged for at least about 4 hours.
Claim 9
Dependent Claim
11 words
The process of Claim 1 wherein said alloy consists essentially of:
Claim 10
Dependent Claim
11 words
The process of Claim 8 wherein said alloy consists essentially of:
Claim 11
Dependent Claim
11 words
The process of Claim 9 wherein said alloy consists essentially of:
Claim 12
Dependent Claim
34 words
The process of Claim 9 wherein magnesium is present in an amount ranging from 0 to 3.2 wt. % and wherein copper is present in an amount ranging from 0.5 to 3.0 wt. %.
Claim 13
Dependent Claim
9 words
The product produced by the process of Claim 1
Claim 14
Dependent Claim
9 words
The product produced by the process of Claim 2
Claim 15
Dependent Claim
9 words
The product produced by the process of Claim 5
Claim 16
Dependent Claim
9 words
The product produced by the process of Claim 7
Claim 17
Dependent Claim
9 words
The product produced by the process of Claim 9
Claim 18
Dependent Claim
9 words
The product produced by the process of Claim 10
Claim 19
Dependent Claim
9 words
The product produced by the process of Claim 11
Claim 20
Dependent Claim
11 words
The process of Claim 1 wherein said alloy consists essentially of:
Claim 21
Dependent Claim
5 words
The product of Claim 19.
References Cited (Backward Citations)
No citation records indexed.
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