US4832910A
Expired / Lapsed
US
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Aluminum-lithium alloys
Assignee: Alcoa Corp
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Filing: 1985-12-23
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Granted: 1989-05-23
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Expires: 2005-12-23
Abstract
Abstract Disclosed is an aluminum-lithium alloy containing a predetermined amount of lanthanides which provides the alloy with an improved combination of strength and fracture toughness relative to a baseline alloy not containing lanthanides but otherwise having the alloy's composition.
Inventors
- 👤 Roberto J. Rioja
- 👤 Philip E. Bretz
- 👤 John E. Jacoby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:43
CPC Classifications
C; C22; C22C; C22C21/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
53 words
An aluminum base alloy consisting essentially of 0.5 to 5.0 wt.% Li and less than 0.3 wt.% lanthanides, said lanthanides being present in an amount effective to provide said alloy with an improved combination of strength and fracture toughness relative to a baseline alloy not containing lanthanides but otherwise having said alloy's composition.
Claim 2
Dependent Claim
53 words
An aluminum base alloy consisting essentially of 0.5 to 5.0 wt.% Li and less than 0.3 wt.% lanthanides, said lanthanides being present in an amount effective to provide said alloy with an improved combination of strength and fracture toughness relative to a baseline alloy not containing lanthanides but otherwise having said alloy's composition.
Claim 3
Dependent Claim
17 words
An alloy as recited in claim 1 wherein the lanthanide content is from 0.01 to 0.2 wt.%.
Claim 4
Dependent Claim
17 words
An alloy as recited in claim 1 wherein the lanthanide content is from 0.01 to 0.12 wt.%.
Claim 5
Dependent Claim
17 words
An alloy as recited in claim 1 wherein the lanthanide content is from 0.01 to 0.05 wt.%.
Claim 6
Dependent Claim
89 words
An aluminum base alloy consisting essentially of from 0.5 to 5.0 wt.% Li, 0.01 to less than 0.3 wt.% lanthanides, 0 to 5.0 wt.% Mg, 0 to 5.0 wt.% Cu, 0 to 1.0 wt.% Zr, 0 to 2.0 wt.% Mn, 0 to 7.0 wt.% Zn, 0.5 wt.% max. Fe and 0.5 wt.% max. Si, said lanthanides being present in an amount effective to provide said alloy with an improved combination of strength and fracture toughness relative to a baseline alloy not containing lanthanides but otherwise having said alloy's composition.
Claim 7
Dependent Claim
89 words
An aluminum base alloy consisting essentially of from 0.5 to 5.0 wt.% Li, 0.01 to less than 0.3 wt.% lanthanides, 0 to 5.0 wt.% Mg, 0 to 5.0 wt.% Cu, 0 to 1.0 wt.% Zr, 0 to 2.0 wt.% Mn, 0 to 7.0 wt.% Zn, 0.5 wt.% max. Fe and 0.5 wt.% max. Si, said lanthanides being present in an amount effective to provide said alloy with an improved combination of strength and fracture toughness relative to a baseline alloy not containing lanthanides but otherwise having said alloy's composition.
Claim 8
Dependent Claim
17 words
An alloy as recited in claim 5 wherein the lithium content is from 1.0 to 4.0 wt.%.
Claim 9
Dependent Claim
17 words
An alloy as recited in claim 5 wherein the lithium content is from 2.0 to 3.0 wt.%.
Claim 10
Dependent Claim
17 words
An alloy as recited in claim 5 wherein the copper content is from 0.1 to 5.0 wt.%.
Claim 11
Dependent Claim
17 words
An alloy as recited in claim 5 wherein the copper content is from 0.5 to 4.0 wt.%.
Claim 12
Dependent Claim
18 words
An alloy as recited in claim 5 wherein iron and silicon contain a maximum of 0.1 wt.% each.
Claim 13
Dependent Claim
49 words
An alloy as recited in claim 5 containing 2.0 to 3.0 wt.% lithium, 0.01 to 0.12 wt.% lanthanides, 0.5 to 4.0 wt.% copper, 0 to 3.0 wt.% magnesium, 0 to 0.2 wt.% zirconium, 0 to 1.0 wt. manganese, and max. 0 to 0.1 wt.% each of iron and silicon.
References Cited (Backward Citations)
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