US5151136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low aspect ratio lithium-containing aluminum extrusions
Assignee: Alcoa Corp
•
Filing: 1990-12-27
•
Granted: 1992-09-29
•
Expires: 2010-12-27
Abstract
Abstract Disclosed is a method of making lithium-containing aluminum base alloy extrusion having at least a section thereof having a low aspect ratio, the extrusions having improved properties in sections thereof having the low aspect ratio. The method comprises providing a body of a lithium-containing aluminum alloy, extruding a low aspect ratio extrusion section, the aspect ratio being in the range of 1 to 2.5, and maintaining the body in a temperature range of 400 DEG to 1000 DEG F. and at least a 4:1 extrusion reduction during said extrusion step, the extrusion section having tensile yield strength of at least 60 ksi and having an ultimate yield strength of at least 4.5 ksi greater than the tensile yield strength.
Inventors
- 👤 Jeffrey J. Witters
- 👤 Brian A. Cheney
- 👤 Roberto J. Rioja
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 21:35
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/04; C22F1/047; C22F1/053; C22F1/057
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
141 words
A method of making lithium-containing aluminum base alloy extrusion having at least a section thereof having a low aspect ratio, the extrusions having improved properties in sections thereof having the low aspect ratio, the method comprising: (a) providing a body of a lithium-containing aluminum alloy having about 0.05 to 1 wt. % Zn; (b) extruding said body into an extrusion including a low aspect ratio section, the aspect ratio being in the range of 1 to 2.5; and (c) maintaining said body in a temperature range of 400° to 1000° F. and including for said low aspect ratio section at least a 4:1 extrusion reduction during said extrusion step, the low aspect ratio extrusion section having tensile yield strength of at least 60 ksi and having an ultimate yield strength of at least 4.5 ksi greater than the tensile yield strength.
Claim 2
Independent Claim
141 words
A method of making lithium-containing aluminum base alloy extrusion having at least a section thereof having a low aspect ratio, the extrusions having improved properties in sections thereof having the low aspect ratio, the method comprising: (a) providing a body of a lithium-containing aluminum alloy having about 0.05 to 1 wt. % Zn; (b) extruding said body into an extrusion including a low aspect ratio section, the aspect ratio being in the range of 1 to 2.5; and (c) maintaining said body in a temperature range of 400° to 1000° F. and including for said low aspect ratio section at least a 4:1 extrusion reduction during said extrusion step, the low aspect ratio extrusion section having tensile yield strength of at least 60 ksi and having an ultimate yield strength of at least 4.5 ksi greater than the tensile yield strength.
Claim 3
Dependent Claim
19 words
The method in accordance with claim 1 wherein the extrusion has sections thereof having aspect ratios greater than 2.5.
Claim 4
Dependent Claim
21 words
The method in accordance with claim 1 wherein the body is maintained in a temperature range of 500° to 800° F.
Claim 5
Dependent Claim
72 words
The method in accordance with claim 1 wherein the alloy contains about 0.2 to 5.0 wt. % Li, 0 to 5.0 wt. % Mg, up to 6.5 wt. % Cu, 0 to 1.0 wt. % Zr, 0 to 2.0 wt. % Mn, 0.05 to 12.0 wt. % Zn, up to 2 wt. % Ag, 0.5 wt. % max. Fe, 0.5 wt. % max. Si, the balance aluminum and incidental elements and impurities.
Claim 6
Dependent Claim
62 words
The method in accordance with claim 1 wherein the alloy contains about 0.2 to 5.0 wt. % Li, at least 2.45 wt. % Cu, 0 to 1 wt. % Ag, 0.05 to 5.0 wt. % Mg, 0.05 to 0.16 wt. % Zr, 0.05 to 12.0 wt. % Zn, 0 to 1 wt. % Mn, the balance aluminum and incidental elements and impurities.
Claim 7
Dependent Claim
59 words
The method in accordance with claim 1 wherein the alloy contains about 1.5 to 3.0 wt. % Li, 2.55 to 2.90 wt. % Cu, 0.2 to 2.5 wt. % Mg, 0.2 to 11.0 wt. % Zn, 0.08 to 0.12 wt. % Zr, 0 to 1.0 wt. % Mn and max. 0.1 wt. % of each of Fe and Si.
Claim 8
Dependent Claim
50 words
The method in accordance with claim 1 wherein the alloy contains at least one of Cr, V, Sc and Ti in the range of about 0.05 to 0.2 wt. % or at least one of Hf, Fe, Ni, Ag and Mn in the range of 0.05 to 0.6 wt. %.
Claim 9
Dependent Claim
24 words
The method in accordance with claim 1 wherein the alloy is selected from AA2090, 2091, 2094, 2095, 8090, 8091, 8190, 1420, 1421 and 2020.
Claim 10
Dependent Claim
32 words
The method in accordance with claim 1 wherein the body is subjected to a preliminary shaping step to provide a preliminarily shaped body followed by further extruding operation to an extruded shape.
Claim 11
Dependent Claim
27 words
The method in accordance with claim 9 wherein the preliminarily shaped body is subjected to a thermal treatment in a temperature range of 400° to 1020° F.
Claim 12
Dependent Claim
22 words
The method in accordance with claim 10 wherein the thermal treatment is carried out in a time of 1 to 50 hours.
Claim 13
Dependent Claim
25 words
The method in accordance with claim 9 wherein in the preliminary shaping step, the body has a reduction in cross section of at least 30%.
Claim 14
Independent Claim
213 words
A method of making lithium-containing aluminum base alloy extrusion having at least a section thereof having a low aspect ratio, the extrusion having improved properties in sections thereof having the low aspect ratio, the method comprising: (a) providing a body of a lithium-containing aluminum alloy comprised of about 0.2 to 5.0 wt. % Li, 0 to 5.0 wt. % Mg, up to 6.0 wt. % Cu, 0 to 1.0 wt. % Zr, 0 to 2.0 wt. % Mn, 0.05 to 12.0 wt. % Zn, up to 2 wt. % Ag, 0.5 wt. % max. Fe, 0.5 wt. % max. Si, the balance aluminum and incidental elements and impurities; (b) extruding said body to provide an extrusion having a section thereof having a low aspect ratio in the range of 1 to 2.5 and having a section having an aspect ratio of greater than 2.5; and (c) maintaining said body in a temperature range of 500° to 800° F. and providing at least a 4:1 extrusion reduction during said extrusion step in the section having the low aspect ratio, the extrusion section having the low aspect ratio having a tensile yield strength of at least 70 ksi and having an ultimate yield strength of at least 4.5 ksi greater than the tensile yield strength.
Claim 15
Independent Claim
213 words
A method of making lithium-containing aluminum base alloy extrusion having at least a section thereof having a low aspect ratio, the extrusion having improved properties in sections thereof having the low aspect ratio, the method comprising: (a) providing a body of a lithium-containing aluminum alloy comprised of about 0.2 to 5.0 wt. % Li, 0 to 5.0 wt. % Mg, up to 6.0 wt. % Cu, 0 to 1.0 wt. % Zr, 0 to 2.0 wt. % Mn, 0.05 to 12.0 wt. % Zn, up to 2 wt. % Ag, 0.5 wt. % max. Fe, 0.5 wt. % max. Si, the balance aluminum and incidental elements and impurities; (b) extruding said body to provide an extrusion having a section thereof having a low aspect ratio in the range of 1 to 2.5 and having a section having an aspect ratio of greater than 2.5; and (c) maintaining said body in a temperature range of 500° to 800° F. and providing at least a 4:1 extrusion reduction during said extrusion step in the section having the low aspect ratio, the extrusion section having the low aspect ratio having a tensile yield strength of at least 70 ksi and having an ultimate yield strength of at least 4.5 ksi greater than the tensile yield strength.
Claim 16
Independent Claim
167 words
A method of making lithium-containing aluminum base alloy extrusion having at least a section thereof having a low aspect ratio, the extrusions having improved properties in sections thereof having the low aspect ratio, the method comprising: (a) providing a body of a lithium-containing aluminum alloy; (b) subjecting said body to a preliminary working operation to provide a preliminarily worked body; (c) extruding said body to provide an extrusion having a section thereof having a low aspect ratio in the range of 1 to 2.5 and having a section having an aspect ratio of greater than 2.5; and (d) maintaining said preliminarily worked body in a temperature range of 500° to 800° F. and providing at least a 4:1 extrusion reduction during said extrusion step in the section having the low aspect ratio, the extrusion section having the low aspect ratio having a tensile yield strength of at least 70 ksi and having an ultimate yield strength of at least 4.5 ksi greater than the tensile yield strength.
Claim 17
Independent Claim
167 words
A method of making lithium-containing aluminum base alloy extrusion having at least a section thereof having a low aspect ratio, the extrusions having improved properties in sections thereof having the low aspect ratio, the method comprising: (a) providing a body of a lithium-containing aluminum alloy; (b) subjecting said body to a preliminary working operation to provide a preliminarily worked body; (c) extruding said body to provide an extrusion having a section thereof having a low aspect ratio in the range of 1 to 2.5 and having a section having an aspect ratio of greater than 2.5; and (d) maintaining said preliminarily worked body in a temperature range of 500° to 800° F. and providing at least a 4:1 extrusion reduction during said extrusion step in the section having the low aspect ratio, the extrusion section having the low aspect ratio having a tensile yield strength of at least 70 ksi and having an ultimate yield strength of at least 4.5 ksi greater than the tensile yield strength.
Claim 18
Dependent Claim
25 words
The method in accordance with claim 14 wherein said worked body is subjected to a thermal treatment in the range of 500° to 1000° F.
Claim 19
Independent Claim
247 words
A method of making lithium-containing aluminum base alloy extrusion having at least a section thereof having a low aspect ratio, the extrusions having improved properties in sections thereof having the low aspect ratio, the method comprising: (a) providing a body of a lithium-containing aluminum alloy comprised of about 0.2 to 5.0 wt. % Li, 0 to 5.0 wt. % Mg, up to 6.0 wt. % Cu, 0 to 1.0 wt. % Zr, 0 to 2.0 wt. % Mn, 0.05 to 12.0 wt. % Zn, up to 2 wt. % Ag, 0.5 wt. % max. Fe, 0.5 wt. % max. Si, the balance aluminum and incidental elements and impurities; (b) subjecting said body to a first extruding operation to provide a preliminarily worked body; (c) annealing said preliminarily worked body in a temperature range of 500° to 1000° F.; (d) further extruding said worked body to provide an extrusion having a section thereof having a low aspect ratio in the range of 1 to 2.5 and having a section having an aspect ratio of greater than 2.5; and (e) maintaining said preliminarily worked body in a temperature range of 400° to 1000° F. and providing at least a 4:1 extrusion reduction during said extrusion step in the section having the low aspect ratio, the extrusion section having the low aspect ratio having a tensile yield strength of at least 70 ksi and having an ultimate yield strength of at least 4.5 ksi greater than the tensile yield strength.
Claim 20
Independent Claim
247 words
A method of making lithium-containing aluminum base alloy extrusion having at least a section thereof having a low aspect ratio, the extrusions having improved properties in sections thereof having the low aspect ratio, the method comprising: (a) providing a body of a lithium-containing aluminum alloy comprised of about 0.2 to 5.0 wt. % Li, 0 to 5.0 wt. % Mg, up to 6.0 wt. % Cu, 0 to 1.0 wt. % Zr, 0 to 2.0 wt. % Mn, 0.05 to 12.0 wt. % Zn, up to 2 wt. % Ag, 0.5 wt. % max. Fe, 0.5 wt. % max. Si, the balance aluminum and incidental elements and impurities; (b) subjecting said body to a first extruding operation to provide a preliminarily worked body; (c) annealing said preliminarily worked body in a temperature range of 500° to 1000° F.; (d) further extruding said worked body to provide an extrusion having a section thereof having a low aspect ratio in the range of 1 to 2.5 and having a section having an aspect ratio of greater than 2.5; and (e) maintaining said preliminarily worked body in a temperature range of 400° to 1000° F. and providing at least a 4:1 extrusion reduction during said extrusion step in the section having the low aspect ratio, the extrusion section having the low aspect ratio having a tensile yield strength of at least 70 ksi and having an ultimate yield strength of at least 4.5 ksi greater than the tensile yield strength.
Claim 21
Dependent Claim
55 words
The method in accordance with claim 16 wherein the alloy contains 0.2 to 5.0 wt. % Li, at least 2.45 wt. % Cu, 0.05 to 5.0 wt. % Mg, 0.05 to 0.16 wt. % Zr, 0.05 to 12.0 wt. % Zn, 0 to 1 wt. % Mn, the balance aluminum and incidental elements and impurities.
Claim 22
Dependent Claim
58 words
The method in accordance with claim 16 wherein the alloy contains 1.5 to 3.0 wt. % Li, 2.55 to 2.90 wt. % Cu, 0.2 to 2.5 wt. % Mg, 0.2 to 11.0 wt. % Zn, 0.08 to 0.12 wt. % Zr, 0 to 1.0 wt. % Mn and max. 0.1 wt. % of each of Fe and Si.
Claim 23
Dependent Claim
92 words
A lithium-containing aluminum alloy extrusion having a section thereof having a low aspect ratio and another section thereof having a high aspect ratio, the extrusion having improved properties in the low aspect ratio section, the extrusion comprised of a lithium-containing alloy having 0.05 to 1 wt. % Zn, the low aspect ratio being in the range of 1 to 2.5, the extrusion having the low aspect ratio having a tensile yield strength of at least 60 ksi and having an ultimate yield strength of 4.5 ksi greater than the tensile yield strength.
Claim 24
Dependent Claim
92 words
A lithium-containing aluminum alloy extrusion having a section thereof having a low aspect ratio and another section thereof having a high aspect ratio, the extrusion having improved properties in the low aspect ratio section, the extrusion comprised of a lithium-containing alloy having 0.05 to 1 wt. % Zn, the low aspect ratio being in the range of 1 to 2.5, the extrusion having the low aspect ratio having a tensile yield strength of at least 60 ksi and having an ultimate yield strength of 4.5 ksi greater than the tensile yield strength.
References Cited (Backward Citations)
JPS6023189A
Cited
US4869870A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-29 | 1996-03-30 | 1996-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-29 | 2000-03-30 | 2000-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-29 | 2004-03-30 | 2004-09-29 | $7700.00 | Window Closed / Lapsed |