US2024287665A1PendingUtilityA1
Aluminum-copper-lithium alloy products
Est. expiryApr 10, 2037(~10.7 yrs left)· nominal 20-yr term from priority
Inventors:Juliette Chevy
C22C 21/18C22C 21/16C22F 1/057C22C 21/12
74
PatentIndex Score
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0
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Claims
Abstract
The invention relates to a product made of an aluminium-based alloy comprising, by wt. %, Cu: 2.5-3.4; Li: 1.6-2.2; Mg: 0.4-0.9; Mn: 0.2-0.6, Zr: 0.08-0.18; Zn: <0.4; Ag: <0.15; Fe+Si: S 0.20; at least one element selected from Ti, Se, Cr, Hf and V, the content of the element, if selected, being: Ti: 0.01-0.15; Se: 0.01-0.15; Cr: 0.01-0.3; Hf: 0.01-0.5; V: 0.01-0.3; other elements: S 0.05 each and: S 0.15 in total; the remainder being aluminium. The invention also relates to a method for manufacturing an aluminum alloy-based, extruded, rolled and/or forged product, and a structural element incorporating at least one product as described above.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A method for manufacturing an extruded, rolled and/or forged product containing aluminum alloy, comprising:
a) producing a bath of liquid metal comprising, in percentage by weight, Cu: 2.5-3.4; Li: 1.6-2.2; Mg: 0.4-0.9; Mn: 0.2-0.6; Zr: 0.08-0.18; Zn: <0.4; Ag: <0.15; Fe+Si≤0.20; at least one element selected from the group consisting of Ti, Sc, Cr, Hf and V, the concentration of said element, if chosen, being Ti: 0.01-0.15; Sc: 0.01-0.15; Cr: 0.01-0.3; Hf: 0.01-0.5; V: 0.01-0.3; other elements≤0.05 each and ≤0.15 in total, the rest aluminum; b) casting an unwrought product from said bath of liquid metal; c) homogenization said unwrought product; d) hot and, optionally, cold working of the unwrought product into an extruded, rolled and/or forged product; e) solution heat treatment and quenching of said product; f) stretching in a controlled manner of said product with a permanent set from 1 to 15%; g) aging of said extruded product by heating to 140 to 170° C. for 5 to 70 hours in such a way that said product has a conventional elastic limit measured at 0.2% of elongation in the direction L, R p0.2 (L), of at least 510 MPa and a toughness K Q (L−T), in the direction L−T, of at least 21 Mpa √{square root over (m)} and such that K Q (L−T)>−0.2667*R p0.2 (L)+169.
2 . The method according to claim 1 , wherein the temperature of homogenizing is between 520° C. and 530° C. and the treatment time is between 6 and 15 hours.
3 . The method according to claim 1 , wherein the aging is carried out at a temperature between 150 to 165° C. for a time with an equivalent t i at 160° C. between 15 and 28 h, t i being defined by the formula:
t
i
=
∫
exp
(
-
16400
/
T
)
dt
exp
(
-
1
6400
/
T
ref
)
where T (in Kelvin) is the instantaneous temperature of treatment of the metal, which changes over the time t (in hours), and T ref is a reference temperature set to 433K.
4 . The method according to claim 1 , wherein step f) comprises stretching in a controlled manner of said product with a permanent set from 2 to 4%.
5 . The method according to claim 1 , wherein the aging is carried out at a temperature between 150 to 165° C. for a time with an equivalent t i at 160° C. between 20 and 27 h, t i being defined by the formula:
t
i
=
∫
exp
(
-
16400
/
T
)
dt
exp
(
-
1
6400
/
T
ref
)
where T (in Kelvin) is the instantaneous temperature of treatment of the metal, which changes over the time t (in hours), and T ref is a reference temperature set to 433K.
6 . The method according to claim 1 , wherein the concentration of copper is from 2.9 to 3.1% by weight.
7 . The method according to claim 1 , wherein the concentration of lithium is from 1.65 to 1.75% by weight.
8 . The method according to claim 1 , wherein the concentration of manganese is from 0.4 to 0.6% by weight.
9 . The method according to claim 1 , wherein the concentration of zirconium is from 0.14 to 0.15% by weight.
10 . The method according to claim 1 , wherein the concentration of magnesium is from 0.5 to 0.8% by weight.
11 . The method according to claim 1 , wherein the concentration of zinc is from 0.05 to 0.35% by weight.
12 . The method according to claim 1 , wherein the concentration of silver is less than 0.10% by weight.
13 . The method according to claim 1 , wherein the concentrations of iron and silicon are each at most 0.08% by weight.
14 . The method according to claim 1 , wherein the concentration of the at least one element, if chosen, being Ti: 0.01-0.05; Sc: 0.02-0.1; Cr: 0.02-0.1; Hf: 0.02-0.1; V: 0.01-0.05.
15 . The method according to claim 1 , wherein the bath of liquid metal comprises, in % by weight,
Cu: 2.8-3.2; Li: 1.65-1.8; Mg: 0.5-0.8; Mn: 0.3-0.6; Zr: 0.12-0.16; Zn: 0.05-0.4; Ag: <0.1; Fe+Si≤0.20; At least one element selected from the group consisting of Ti, Sc, Cr, Hf and V, the concentration of the element, if chosen, being in weight %: Ti: 0.01-0.05; Sc: 0.02-0.1; Cr: 0.02-0.1; Hf: 0.02-0.1; V: 0.01-0.05; other elements≤0.05 each and ≤0.15 in total, the rest aluminum.
16 . The method according to claim 1 , wherein the solution heat treatment is carried out at a temperature between 490° C. and 550° C. for 15 min to 8 h.
17 . The method according to claim 1 , wherein the permanent set is from 2 to 4%.Cited by (0)
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