2xxx aluminum lithium alloys

Patent metadata

Field	Value
Publication number	US-2021404038-A1
Application number	US-202117307453-A
Country	US
Kind code	A1
Filing date	May 4, 2021
Priority date	Nov 7, 2018
Publication date	Dec 30, 2021
Grant date	—

Abstract

New 2xxx aluminum alloys having are disclosed. The new 2xxx aluminum alloys generally include 2.5-3.9 wt. % Cu, 0.82-1.20 wt. % Li, 0.5-2.0 wt. % Zn, 0.10-0.60 wt. % Mn, 0.05-0.35 wt. % Mg, from 0.05 to 0.50 wt. % of at least one grain structure control element, wherein the at least one grain structure control element is selected from the group consisting of Zr, Sc, Cr, V, Hf, other rare earth elements, and combinations thereof, up to 0.22 wt. % Ag, up to 0.15 wt. % Fe, up to 0.12 wt. % Si, and up to 0.15 wt. % Ti, the balance being aluminum, incidental elements and impurities. The new 2xxx aluminum alloys may realize an improved combination of two or more of strength, fracture toughness, elongation, and corrosion resistance.

First claim

What is claimed is:

1 . A 2xxx aluminum alloy comprising:
3.1-3.8 wt. % Cu; 0.82-1.20 wt. % Li; 0.5-1.4 wt. % Zn; 0.10-0.60 wt. % Mn; 0.05-0.35 wt. % Mg; from 0.05 to 0.50 wt. % of at least one grain structure control element, wherein the at least one grain structure control element is selected from the group consisting of Zr, Sc, Cr, V, Hf, other rare earth elements, and combinations thereof, up to 0.05 wt. % Ag; up to 0.15 wt. % Fe; up to 0.12 wt. % Si; and up to 0.15 wt. % Ti; the balance being aluminum, incidental elements and impurities.

2 . The 2xxx aluminum alloy of claim 1 , wherein the 2xxx aluminum alloy includes not greater than 0.01 wt. % Ag.

3 . The 2xxx aluminum alloy of claim 1 , wherein the 2xxx aluminum alloy includes at least 0.7 wt. % Zn.

4 . The 2xxx aluminum alloy of claim 1 , wherein the 2xxx aluminum alloy includes at least 0.10 wt. % Mg.

5 . The 2xxx aluminum alloy of claim 1 , wherein (wt. % Cu)/(wt. % Zn) is not greater than 4.10.

6 . The 2xxx aluminum alloy of claim 1 , wherein the 2xxx aluminum alloy is in the form of a wrought product having a thickness of at least 101.6 mm; and
wherein the wrought product realizes at least one of:
(i) a tensile yield strength (ST) of at least 440 MPa in the T8 temper;
(ii) a plane-strain (K IC ) fracture toughness (S-L) of at least 20 MPa-sqrt-m in the T8 temper;
(iii) an elongation (ST) of at least 1.5% in the T8 temper; or
(iv) wherein the wrought product is stress corrosion cracking resistant in the T8 temper.

7 . A 2xxx aluminum alloy comprising:
2.5-3.4 wt. % Cu; 0.82-1.20 wt. % Li; 1.1-2.0 wt. % Zn; 0.10-0.60 wt. % Mn; 0.05-0.35 wt. % Mg; from 0.05 to 0.50 wt. % of at least one grain structure control element, wherein the at least one grain structure control element is selected from the group consisting of Zr, Sc, Cr, V, Hf, other rare earth elements, and combinations thereof, up to 0.05 wt. % Ag; up to 0.15 wt. % Fe; up to 0.12 wt. % Si; and up to 0.15 wt. % Ti; the balance being aluminum, incidental elements and impurities.

8 . The 2xxx aluminum alloy of claim 7 , wherein the 2xxx aluminum alloy includes not greater than 0.01 wt. % Ag.

9 . The 2xxx aluminum alloy of claim 7 , wherein the 2xxx aluminum alloy includes at least 1.3 wt. % Zn.

10 . The 2xxx aluminum alloy of claim 7 , wherein the 2xxx aluminum alloy includes not greater than 3.2 wt. % Cu.

11 . The 2xxx aluminum alloy of claim 7 , wherein the 2xxx aluminum alloy includes at least 0.10 wt. % Mg.

12 . The 2xxx aluminum alloy of claim 7 , wherein (wt. % Cu)/(wt. % Zn) is not greater than 3.5.

13 . The 2xxx aluminum alloy of claim 7 , wherein the 2xxx aluminum alloy is in the form of a wrought product having a thickness of at least 101.6 mm; and
wherein the wrought product realizes at least one of:
(i) a tensile yield strength (ST) of at least 440 MPa in the T8 temper;
(ii) a plane-strain (K IC ) fracture toughness (S-L) of at least 20 MPa-sqrt-m in the T8 temper;
(iii) an elongation (ST) of at least 1.5% in the T8 temper; or
(iv) wherein the wrought product is stress corrosion cracking resistant in the T8 temper.

Assignees

• Arconic Tech Llc

Inventors

• Boselli Julien
• Lin Jen C
• Karabin Lynette M
• Wen Wei

Classifications

• B22D21/007 Primary

  with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C · CPC title

• B22F10/28

  Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM] · CPC title

• C22C21/18 Primary

  with zinc · CPC title

• C22C21/16

  with magnesium · CPC title

• C22C21/14

  with silicon · CPC title