5xxx aluminum alloys

Patent metadata

Field	Value
Publication number	US-2023272515-A1
Application number	US-202318134969-A
Country	US
Kind code	A1
Filing date	Apr 14, 2023
Priority date	Nov 24, 2020
Publication date	Aug 31, 2023
Grant date	—

Abstract

New 5xxx aluminum alloys and products made therefrom are disclosed. In one approach, a new 5xxx aluminum alloy may include from 3.5 to 4.6 wt. % Mg, from 0.5 to 1.3 wt. % Mn, from 0.08 to 0.15 wt. % Sc, from 0.05 to 0.15 wt. % Zr, up to 0.8 wt. % Zn, up to 0.20 wt. % Cr, up to 0.20 wt. % V, up to 0.20 wt. % Cu, up to 0.15 wt. % Ti, up to 0.10 wt. % Fe, up to 0.10 wt. % Si, the balance being aluminum, incidental elements and impurities. The 5xxx aluminum alloy sheet product may include, for instance, at least 0.5 vol. % of beta phase particles.

First claim

What is claimed is:

1 . A 5xxx aluminum alloy sheet product comprising:
from 3.5 to 4.6 wt. % Mg; from 0.5 to 1.3 wt. % Mn; from 0.08 to 0.15 wt. % Sc; from 0.05 to 0.15 wt. % Zr; up to 0.8 wt. % Zn; up to 0.20 wt. % Cr; up to 0.20 wt. % V; up to 0.20 wt. % Cu; up to 0.15 wt. % Ti; up to 0.10 wt. % Fe; up to 0.10 wt. % Si; the balance being aluminum, incidental elements and impurities; wherein the 5xxx aluminum alloy sheet product has a thickness of from 0.5 to 8.0 mm; wherein the 5xxx aluminum alloy sheet product comprises at least 0.5 vol. % of beta phase particles; wherein the beta phase particles define an aspect ratio distribution; wherein an AR99 of the aspect ratio distribution is not greater than 10.0; wherein the beta phase particles define a beta phase particle size distribution; wherein a D99 of the beta phase particle size distribution is not greater than 3.0 micrometers.

2 . The 5xxx aluminum alloy sheet product of claim 1 , wherein the 5xxx aluminum alloy sheet product includes at least 0.15 wt. % Zn.

3 . The 5xxx aluminum alloy sheet product of claim 2 , wherein the 5xxx aluminum alloy sheet product includes not greater than 0.75 wt. % Zn.

4 . The 5xxx aluminum alloy sheet product of claim 1 , wherein the 5xxx aluminum alloy sheet product includes not greater than 0.14 wt. % Sc.

5 . The 5xxx aluminum alloy sheet product of claim 4 , wherein the 5xxx aluminum alloy sheet product includes not greater than 0.14 wt. % Zr.

6 . The 5xxx aluminum alloy sheet product of claim 5 , wherein (wt. % Sc)+(wt. % Zr)≤0.20 wt. %.

7 . The 5xxx aluminum alloy sheet product of claim 1 , wherein the 5xxx aluminum alloy sheet product includes not greater than 0.15 wt. % Cu.

8 . The 5xxx aluminum alloy sheet product of claim 1 , wherein the 5xxx aluminum alloy sheet product comprises at least 0.75 vol. % of the beta phase particles.

9 . The 5xxx aluminum alloy sheet product of claim 8 , wherein the AR99 of the aspect ratio distribution is not greater than 9.0.

10 . The 5xxx aluminum alloy sheet product of claim 9 , wherein the D99 of the beta phase particle size distribution is not greater than 2.8 micrometer.

11 . The 5xxx aluminum sheet product of claim 1 , wherein the 5xxx aluminum alloy sheet product is unrecrystallized.

12 . The 5xxx aluminum sheet product of claim 11 , wherein the 5xxx aluminum sheet is strength retentive, wherein the 5xxx aluminum sheet product realizes a strength (TYS) of not greater than 50 MPa from a final annealed condition to a creep annealed condition.

13 . A method of making a 5xxx aluminum alloy sheet product, the method comprising:
casting an aluminum alloy ingot, wherein the aluminum alloy ingot comprises:
from 3.5 to 4.6 wt. % Mg;
from 0.5 to 1.3 wt. % Mn;
from 0.08 to 0.15 wt. % Sc;
from 0.05 to 0.15 wt. % Zr;
up to 0.8 wt. % Zn;
up to 0.20 wt. % Cr;
up to 0.20 wt. % V;
up to 0.20 wt. % Cu;
up to 0.15 wt. % Ti;
up to 0.10 wt. % Fe;
up to 0.10 wt. % Si;
the balance being aluminum, incidental elements and impurities;
homogenizing the ingot; hot rolling the ingot to an intermediate gauge material; cold rolling the intermediate gauge material to a final gauge sheet product, wherein the final gauge sheet product has a thickness of from 0.5 to 8.0 mm; and
annealing the final gauge sheet product at a final anneal temperature, wherein the final anneal temperature is not greater than T-anneal(max), and wherein the final anneal temperature is from 145-278° C. (293-532° F.).

14 . The method of claim 15 , wherein the final anneal temperature is not greater than 270° C. (518° F.).

15 . The method of claim 16 , wherein the final anneal temperature is at least 150° C. (302° F.).

16 . The method of claim 15 , wherein the final anneal hold time is from 5 minutes to 100 hours.

17 . The method of claim 15 , wherein the T-anneal(max), in degrees Fahrenheit, is not greater than the output of:
116.3+(97.7*(wt. % Mg))−(87*(wt. % Si))+(11.6*(wt. % Mn))+(105.8*(wt. % Zn))−(5.04*(wt. % Mg) 2 )−(41.7*(wt. % Zn) 2 ).

Assignees

• Arconic Tech Llc

Inventors

• Yanar Cagatay
• Venema Gregory B
• Wen Wei

Classifications

• C22F1/047 Primary

  of alloys with magnesium as the next major constituent · CPC title

• C22C21/08

  with silicon · CPC title

• C22C21/06 Primary

  with magnesium as the next major constituent · CPC title