Patent US4844750A successfully refreshed from Google Patents.
US4844750A
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Aluminum-lithium alloys
Assignee: Alcoa Corp
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Filing: 1985-10-31
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Granted: 1989-07-04
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Expires: 2005-10-31
Abstract
Abstract Disclosed is a method of making lithium containing aluminum base alloy products having improved properties in the short transverse direction. The method comprises the steps of providing a body of a lithium containing aluminum base alloy and heating the body to a temperature for initial hot working but at a temperature sufficiently low that a substantial amount of grain boundary precipitate is not dissolved. The method further includes hot working the heated body to provide an intermediate product, recrystallizing the intermediate product and then hot working the recrystallized product to a final shaped product. The final shaped product is solution heat treated, quenched and aged to provide a non-recrystallized final product having improved levels of short transverse properties.
Inventors
- 👤 Chul Won Cho
- 👤 Ralph R. Sawtell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:16
CPC Classifications
C; C22; C22C; C22C21/00; C22F; C22F1/00; C22F1/04
Claims Analysis
Total Claims: 45
Claim 1
Independent Claim
169 words
A method of making lithium containing aluminum base alloy products having improved properties in the short transverse direction, the method comprising the steps of: (a) providing a body of an aluminum base alloy consisting essentially of 0.5 to 4.0 wt. % Li, 0 to 5.0 wt. % Mg, up to 5.0 wt. % Cu, 0 to 2.0 wt. % Mn, 0 to 7.0 wt. % Zn, 0.5 wt. % max. Fe, 0.5 wt. % max. Si, and one of the elements selected from the group consisting of Zr, Cr, Ce and Sc, the balance aluminum and incidental elements and impurities; (b) heating the body to a temperature for initial hot working to put said body in a condition for recrystallization; (c) hot working the heated body to provide an intermediate product; (d) recrystallizing said intermediate product; (e) hot working the recrystallized product to a shaped product; and (f) solution heat treating, quenching and aging said shaped product to provide a non-recrystallized product having improved levels of short transverse properties.
Claim 2
Independent Claim
169 words
A method of making lithium containing aluminum base alloy products having improved properties in the short transverse direction, the method comprising the steps of: (a) providing a body of an aluminum base alloy consisting essentially of 0.5 to 4.0 wt. % Li, 0 to 5.0 wt. % Mg, up to 5.0 wt. % Cu, 0 to 2.0 wt. % Mn, 0 to 7.0 wt. % Zn, 0.5 wt. % max. Fe, 0.5 wt. % max. Si, and one of the elements selected from the group consisting of Zr, Cr, Ce and Sc, the balance aluminum and incidental elements and impurities; (b) heating the body to a temperature for initial hot working to put said body in a condition for recrystallization; (c) hot working the heated body to provide an intermediate product; (d) recrystallizing said intermediate product; (e) hot working the recrystallized product to a shaped product; and (f) solution heat treating, quenching and aging said shaped product to provide a non-recrystallized product having improved levels of short transverse properties.
Claim 3
Dependent Claim
28 words
The method in accordance with claim 1 wherein in step (b) thereof the heating is carried out at a temperature in the range of 600° to 900° F.
Claim 4
Dependent Claim
28 words
The method in accordance with claim 1 wherein in step (b) thereof the heating is carried out at a temperature in the range of 700° to 900° F.
Claim 5
Dependent Claim
28 words
The method in accordance with claim 1 wherein in step (b) thereof the heating is carried out at a temperature in the range of 800° to 870° F.
Claim 6
Dependent Claim
29 words
The method in accordance with claim 1 wherein the hot working of the heated body is carried out at a temperature in the range of 400° to 975° F.
Claim 7
Dependent Claim
29 words
The method in accordance with claim 1 wherein the hot working of the heated body is carried out at a temperature in the range of 700° to 870° F.
Claim 8
Dependent Claim
25 words
The method in accordance with claim 1 wherein the recrystallization step is carried out at a temperature in the range of 900° to 1040° F.
Claim 9
Dependent Claim
25 words
The method in accordance with claim 1 wherein the recrystallization step is carried out at a temperature in the range of 980° to 1020° F.
Claim 10
Dependent Claim
40 words
The method in accordance with claim 1, step (e) thereof, wherein the hot working of the recrystallized product is carried out at a temperature in the range of 700° to 1040° F. at the start of the hot working operation.
Claim 11
Dependent Claim
40 words
The method in accordance with claim 1, step (e) thereof, wherein the hot working of the recrystallized product is carried out at a temperature in the range of 750° to 950° F. at the start of the hot working operation.
Claim 12
Dependent Claim
40 words
The method in accordance with claim 1, step (e) thereof, wherein the hot working of the recrystallized product is carried out at a temperature in the range of 350° to 850° F. at the finish of the hot working operation.
Claim 13
Dependent Claim
40 words
The method in accordance with claim 1, step (e) thereof, wherein the hot working of the recrystallized product is carried out at a temperature in the range of 350° to 850° F. at the finish of the hot working operation.
Claim 14
Dependent Claim
26 words
The method in accordance with claim 1 wherein the solution heat treating is carried out at a temperature in the range of 900° to 1050° F.
Claim 15
Dependent Claim
15 words
The method in accordance with claim 1 wherein the quench is a cold water quench.
Claim 16
Dependent Claim
31 words
The method in accordance with claim 1 wherein after solution heat treating and quenching, the shaped product is artificially aged at a temperature in the range of 150° to 400° F.
Claim 17
Dependent Claim
15 words
The method in accordance with claim 1 wherein the product is a flat rolled product.
Claim 18
Dependent Claim
30 words
The method in accordance with claim 16 wherein the body is hot rolled to provide a flat rolled product having a thickness of 1.5 to 15 times the final product.
Claim 19
Dependent Claim
46 words
The method in accordance with claim 1 including imparting to said product prior to an aging step a working effect equivalent to stretching said product at room temperature in order that, after an aging step, said product can have improved combinations of strength and fracture toughness.
Claim 20
Dependent Claim
29 words
The method in accordance with claim 18 wherein said working effect equivalent to stretching the wrought product an amount greater than 3% of its original length at room temperature.
Claim 21
Dependent Claim
27 words
The method in accordance with claim 19 wherein said working effect equivalent to stretching the wrought product 4 to 10% of its original length at room temperature.
Claim 22
Dependent Claim
26 words
The method in accordance with claim 18 wherein said working effect is stretching the wrought product 3 to 10% of its original length at room temperature.
Claim 23
Dependent Claim
26 words
The method in accordance with claim 21 wherein said working effect is stretching the wrought product 4 to 10% of its original length at room temperature.
Claim 24
Dependent Claim
22 words
The method in accordance with claim 1 wherein the body is subjected to a homogenization treatment prior to heating in step (b).
Claim 25
Independent Claim
247 words
A method of making lithium containing aluminum base alloy products having improved properties in the short transverse direction, the method comprising the steps of: (a) providing a body of an aluminum base alloy consisting essentially of 0.5 to 4.0 wt. % Li, 0 to 5.0 wt. % Mg, up to 5.0 wt. % Cu, 0 to 2.0 wt. % Mn, 0 to 7.0 wt. % Zn, 0.5 wt. % max. Fe, 0.5 wt. % max. Si, and one of the elements selected from the group consisting of Zr, Cr, Ce and Sc, the balance aluminum and incidental elements and impurities; (b) heating the body to a temperature in the range of 700° to 900° F. for initial hot working to put said body in a condition for recrystallization; (c) hot working the heated body to a temperature in the range of 400° to 900° F. to provide an intermediate flat rolled product having a thickness 1.5 to 15 that of a final product; (d) recrystallizing said intermediate product at a temperature in the range of 900° to 1040° F.; (e) hot working the recrystallized product to a final thickness product, said hot working of the recrystallized product starting at a temperature in the range of 750° to 950° F.; and (f) solution heat treating the final product at a temperature in the range of 900° to 1050° F., quenching and aging said shaped product to provide a non-recrystallized final product having improved levels of short transverse properties.
Claim 26
Independent Claim
247 words
A method of making lithium containing aluminum base alloy products having improved properties in the short transverse direction, the method comprising the steps of: (a) providing a body of an aluminum base alloy consisting essentially of 0.5 to 4.0 wt. % Li, 0 to 5.0 wt. % Mg, up to 5.0 wt. % Cu, 0 to 2.0 wt. % Mn, 0 to 7.0 wt. % Zn, 0.5 wt. % max. Fe, 0.5 wt. % max. Si, and one of the elements selected from the group consisting of Zr, Cr, Ce and Sc, the balance aluminum and incidental elements and impurities; (b) heating the body to a temperature in the range of 700° to 900° F. for initial hot working to put said body in a condition for recrystallization; (c) hot working the heated body to a temperature in the range of 400° to 900° F. to provide an intermediate flat rolled product having a thickness 1.5 to 15 that of a final product; (d) recrystallizing said intermediate product at a temperature in the range of 900° to 1040° F.; (e) hot working the recrystallized product to a final thickness product, said hot working of the recrystallized product starting at a temperature in the range of 750° to 950° F.; and (f) solution heat treating the final product at a temperature in the range of 900° to 1050° F., quenching and aging said shaped product to provide a non-recrystallized final product having improved levels of short transverse properties.
Claim 27
Independent Claim
259 words
A method of making lithium containing aluminum base alloy products having improved properties in the short transverse direction, the method comprising the steps of: (a) providing a body of an aluminum base alloy consisting essentially of 0.5 to 4.0 wt. % Li, 0 to 5.0 wt. % Mg, up to 5.0 wt. % Cu, 0 to 2.0 wt. % Mn, 0 to 7.0 wt. % Zn, 0.5 wt. % max. Fe, 0.5 wt. % max. Si, and one of the elements selected from the group consisting of Zr, Cr, Ce and Sc, the balance aluminum and incidental elements and impurities; (b) heating the body to a temperature in the range of 700° to 900° F. for initial hot working to put said body in a condition for recrystallization; (c) hot working the heated body to a temperature in the range of 400° to 900° F. to provide an intermediate flat rolled product having a thickness 1.5 to 15 that of a final product; (d) recrystallizing said intermediate product at a temperature in the range of 900° to 1040° F.; (e) hot working the recrystallized product to a final thickness product, said hot working of the recrystallized product starting at a temperature in the range of 700° to 1040° F.; and (f) solution heat treating and quenching the final product; (g) imparting to said product prior to an aging step a working effect equivalent to stretching said product at room temperature; and (h) aging said shaped product to provide a non-recrystallized final product having improved levels of short transverse properties.
Claim 28
Independent Claim
259 words
A method of making lithium containing aluminum base alloy products having improved properties in the short transverse direction, the method comprising the steps of: (a) providing a body of an aluminum base alloy consisting essentially of 0.5 to 4.0 wt. % Li, 0 to 5.0 wt. % Mg, up to 5.0 wt. % Cu, 0 to 2.0 wt. % Mn, 0 to 7.0 wt. % Zn, 0.5 wt. % max. Fe, 0.5 wt. % max. Si, and one of the elements selected from the group consisting of Zr, Cr, Ce and Sc, the balance aluminum and incidental elements and impurities; (b) heating the body to a temperature in the range of 700° to 900° F. for initial hot working to put said body in a condition for recrystallization; (c) hot working the heated body to a temperature in the range of 400° to 900° F. to provide an intermediate flat rolled product having a thickness 1.5 to 15 that of a final product; (d) recrystallizing said intermediate product at a temperature in the range of 900° to 1040° F.; (e) hot working the recrystallized product to a final thickness product, said hot working of the recrystallized product starting at a temperature in the range of 700° to 1040° F.; and (f) solution heat treating and quenching the final product; (g) imparting to said product prior to an aging step a working effect equivalent to stretching said product at room temperature; and (h) aging said shaped product to provide a non-recrystallized final product having improved levels of short transverse properties.
Claim 29
Dependent Claim
31 words
The method in accordance with claim 25 wherein said working effect is equivalent to stretching the wrought product an amount greater than about 4% of its original length at room temperature.
Claim 30
Dependent Claim
26 words
The method in accordance with claim 25 wherein said working effect is stretching the wrought product 4 to 10% of its original length at room temperature.
Claim 31
Independent Claim
189 words
A method of making lithium containing aluminum base alloy products having improved properties in the short transverse direction, the method comprising the steps of: (a) providing a body of an aluminum base alloy consisting essentially of 0.5 to 4.0 wt. % Li, 0 to 5.0 wt. % Mg, up to 5.0 wt. % Cu, 0 to 2.0 wt. % Mn, 0 to 7.0 wt. % Zn, 0.5 wt. % max. Fe, 0.5 wt. % max. Si, and one of the elements selected from the group consisting of Zr, Cr, Ce and Sc, the balance aluminum and incidental elements and impurities; (b) heating the body to a temperature for initial hot working but at a temperature sufficiently low such that a substantial amount of grain boundary precipitate is not dissolved in order to provide nucleation sites for subsequent recrystallization; (c) hot working the heated body to provide an intermediate product; (d) recrystallizing said intermediate product; (e) hot working the recrystallized product to a final shaped product; and (f) solution heat treating, quenching and aging said shaped product to provide a non-recrystallized final product having improved levels of short transverse properties.
Claim 32
Independent Claim
189 words
A method of making lithium containing aluminum base alloy products having improved properties in the short transverse direction, the method comprising the steps of: (a) providing a body of an aluminum base alloy consisting essentially of 0.5 to 4.0 wt. % Li, 0 to 5.0 wt. % Mg, up to 5.0 wt. % Cu, 0 to 2.0 wt. % Mn, 0 to 7.0 wt. % Zn, 0.5 wt. % max. Fe, 0.5 wt. % max. Si, and one of the elements selected from the group consisting of Zr, Cr, Ce and Sc, the balance aluminum and incidental elements and impurities; (b) heating the body to a temperature for initial hot working but at a temperature sufficiently low such that a substantial amount of grain boundary precipitate is not dissolved in order to provide nucleation sites for subsequent recrystallization; (c) hot working the heated body to provide an intermediate product; (d) recrystallizing said intermediate product; (e) hot working the recrystallized product to a final shaped product; and (f) solution heat treating, quenching and aging said shaped product to provide a non-recrystallized final product having improved levels of short transverse properties.
Claim 33
Dependent Claim
27 words
The method in accordance with claim 1 wherein the non-recrystallized final product has an elongation in the range of 2 to 10% in the short transverse direction.
Claim 34
Independent Claim
177 words
A method of making lithium containing aluminum base alloy products having improved properties in the short transverse direction, the method comprising the steps of: (a) providing a body of an aluminum base alloy consisting essentially of 0.5 to 4.0 wt. % Li, 0 to 5.0 wt. % Mg, up to 5.0 wt. % Cu, 0 to 2.0 wt. % Mn, 0 to 7.0 wt. % Zn, 0.5 wt. % max. Fe, 0.5 wt. % max. Si, and one of the elements selected from the group consisting of Zr, Cr, Ce and Sc, the balance aluminum and incidental elements and impurities; (b) heating the body to a low temperature preheat for initial low temperature hot working to put said body in a condition for recrystallization; (c) low temperature hot working the heated body to provide an intermediate product; (d) recrystallizing said intermediate product; (e) hot working the recrystallized product to a final shaped product; and (f) solution heat treating, quenching and aging said shaped product to provide a non-recrystallized final product having improved levels of short transverse properties.
Claim 35
Independent Claim
177 words
A method of making lithium containing aluminum base alloy products having improved properties in the short transverse direction, the method comprising the steps of: (a) providing a body of an aluminum base alloy consisting essentially of 0.5 to 4.0 wt. % Li, 0 to 5.0 wt. % Mg, up to 5.0 wt. % Cu, 0 to 2.0 wt. % Mn, 0 to 7.0 wt. % Zn, 0.5 wt. % max. Fe, 0.5 wt. % max. Si, and one of the elements selected from the group consisting of Zr, Cr, Ce and Sc, the balance aluminum and incidental elements and impurities; (b) heating the body to a low temperature preheat for initial low temperature hot working to put said body in a condition for recrystallization; (c) low temperature hot working the heated body to provide an intermediate product; (d) recrystallizing said intermediate product; (e) hot working the recrystallized product to a final shaped product; and (f) solution heat treating, quenching and aging said shaped product to provide a non-recrystallized final product having improved levels of short transverse properties.
Claim 36
Dependent Claim
132 words
An unrecrystallized aluminum base alloy wrought product suitable for aging and having the ability to develop improved combinations of strength and fracture toughness in the short transverse direction in response to an aging treatment, the product consisting essentially of 0.5 to 4.0 wt. % Li, 0 to 5.0 wt. % Mg, up to 5.0 wt. % Cu, 0 to 2.0 wt. % Mn, 0 to 7.0 wt. % Zn, 0.5 wt. % max. Fe, 0.5 wt. % max. Si, and one of the elements selected from the group consisting of Zr, Cr, Ce and Sc, the balance aluminum and incidental elements and impurities, the product having imparted thereto a recrystallization effect prior to hot working and solution heat treating to provide an unrecrystallized product having improved properties in the short transverse direction.
Claim 37
Dependent Claim
132 words
An unrecrystallized aluminum base alloy wrought product suitable for aging and having the ability to develop improved combinations of strength and fracture toughness in the short transverse direction in response to an aging treatment, the product consisting essentially of 0.5 to 4.0 wt. % Li, 0 to 5.0 wt. % Mg, up to 5.0 wt. % Cu, 0 to 2.0 wt. % Mn, 0 to 7.0 wt. % Zn, 0.5 wt. % max. Fe, 0.5 wt. % max. Si, and one of the elements selected from the group consisting of Zr, Cr, Ce and Sc, the balance aluminum and incidental elements and impurities, the product having imparted thereto a recrystallization effect prior to hot working and solution heat treating to provide an unrecrystallized product having improved properties in the short transverse direction.
Claim 38
Dependent Claim
25 words
The product in accordance with claim 31 wherein in the short transverse direction the product has an elongation in the range of 1 to 10%.
Claim 39
Dependent Claim
50 words
The product in accordance with claim 31 wherein the product has imparted thereto prior to an aging step a working effect equivalent to stretching an amount greater than about 3% at room temperature in order that after an aging step, the product has improved properties in the short transverse direction.
Claim 40
Dependent Claim
30 words
The product in accordance with claim 31 wherein Li is in the range of 1.0 to 4.0 wt. % and Zr in the range of 0.03 to 0.15 wt. %.
Claim 41
Dependent Claim
19 words
The product in accordance with claim 31 wherein Cu is in the range of 1.0 to 5.0 wt. %.
Claim 42
Dependent Claim
64 words
The product in accordance with claim 31 wherein Li is in the range of 2.0 to 3.0 wt. %, Cu is in the range of 0.5 to 4.0 wt. %, Mg is in the range of 0 to 3.0 wt. %, Zr is in the range of 0.05 to 0.12 wt. % and Mn is in the range of 0 to 1.0 wt. %.
Claim 43
Dependent Claim
15 words
The product in accordance with claim 31 wherein the wrought product is flat rolled product.
Claim 44
Dependent Claim
135 words
An unrecrystallized aluminum base alloy wrought product having improved short transverse properties, the product comprising Li in the range of 2.0 to 3.0 wt. %, Cu in the range of 0.5 to 4.0 wt. %, Mg in the range of 0 to 3.0 wt. %, Zr in the range of 0.05 to 0.12 wt. % and Mn in the range of 0 to 1.0 wt. %, the product having imparted thereto a recrystallization effect prior to hot working and solution heat treating to provide an un-recrystallized product and having imparted thereto prior to an aging step a working effect equivalent to stretching a amount greater than about 3% at room temperature in order that after an aging step, the product having an elongation in the short transverse direction in the range of 2 to 10%.
Claim 45
Dependent Claim
135 words
An unrecrystallized aluminum base alloy wrought product having improved short transverse properties, the product comprising Li in the range of 2.0 to 3.0 wt. %, Cu in the range of 0.5 to 4.0 wt. %, Mg in the range of 0 to 3.0 wt. %, Zr in the range of 0.05 to 0.12 wt. % and Mn in the range of 0 to 1.0 wt. %, the product having imparted thereto a recrystallization effect prior to hot working and solution heat treating to provide an un-recrystallized product and having imparted thereto prior to an aging step a working effect equivalent to stretching a amount greater than about 3% at room temperature in order that after an aging step, the product having an elongation in the short transverse direction in the range of 2 to 10%.
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