# US 2021/0340656 A1 · 7xxx aluminum alloys

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- Number: US 2021/0340656 A1
- Document ID: US20210340656A1
- Status: Published application
- Kind: A1
- Application number: 17/308,794
- Filed: 2021-05-05
- Published: 2021-11-04
- Earliest claimed: 2018-11-14
- Assignees: Arconic Technologies LLC
- Applicants: Arconic Technologies LLC
- Inventors: Julien Boselli; Jen C. Lin; Lynette M. Karabin; Severine Cambier; Francine S. Bovard; Wenping Zhang
- Web page: https://patentgrep.com/patent/US20210340656A1

## CPC

- C22F 1/053: of alloys with zinc as the next major constituent
- C22C 21/10: with zinc as the next major constituent
- C22F: CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass, C23F17/00)
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

New 7xxx aluminum alloys are disclosed. The new 7xxx aluminum alloys generally include from 0.05 to 1.0 wt. % Ag. In one approach, a new 7xxx aluminum alloy includes from 0.05 to 1.0 wt. % Ag, from 5.5 to 9.0 wt. % Zn, from 1.2 to 2.6 wt. % Cu, from 1.3 to 2.5 wt. % Mg, up to 0.60 wt. % Mn, up to 1.0 wt. % of at least one grain structure control material, wherein the at least one grain structure control material is selected from the group consisting of Zr, Cr, V, Hf, other rare earth elements, and combinations thereof, up to 0.30 wt. % Fe, up to 0.30 wt. % Si, up to 0.15 wt. % Ti, not greater than 0.08 wt. % Sc, and not greater than 0.05 wt. % Li, the balance being aluminum, optional incidental elements and impurities.

## Claims

### Claim 1

A wrought 7xxx aluminum alloy product, wherein the wrought 7xxx aluminum alloy product comprises:
from 0.05 to 1.0 wt. % Ag;
from 1.2 to 2.6 wt. % Cu;
from 1.3 to 2.5 wt. % Mg;
from 5.5 to 9.0 wt. % Zn;
up to 0.60 wt. % Mn;
up to 1.0 wt. % of at least one grain structure control material, wherein the at least one grain structure control material is selected from the group consisting of Zr, Cr, V, Hf, other rare earth elements, and combinations thereof,
up to 0.30 wt. % Fe;
up to 0.30 wt. % Si;
up to 0.15 wt. % Ti;
not greater than 0.08 wt. % Sc;
not greater than 0.05 wt. % Li;
the balance being aluminum, optional incidental elements and impurities;
wherein the wrought 7xxx aluminum alloy product has a thickness of from 12.7 to 305 mm.

### Claim 2 (depends on 1)

The wrought 7xxx aluminum alloy product of claim 1, wherein the 7xxx aluminum alloy comprises from 6.0 to 8.5 wt. % Zn.

### Claim 3 (depends on 2)

The wrought 7xxx aluminum alloy product of claim 2, wherein the 7xxx aluminum alloy comprises from 1.5 to 2.0 wt. % Cu.

### Claim 4 (depends on 3)

The wrought 7xxx aluminum alloy product of claim 3, wherein the 7xxx aluminum alloy comprises from 1.4 to 2.0 wt. % Mg.

### Claim 5 (depends on 1)

The wrought 7xxx aluminum alloy product of claim 1, wherein (wt. % Cu)+(wt. % Mg)≥3.0 wt. %.

### Claim 6 (depends on 1)

The wrought 7xxx aluminum alloy product of claim 1, wherein the 7xxx aluminum alloy comprises at least 0.10 wt. % Ag.

### Claim 7 (depends on 1)

The wrought 7xxx aluminum alloy product of claim 1, wherein the 7xxx aluminum alloy comprises not greater than 0.7 wt. % Ag.

### Claim 8 (depends on 1)

The wrought 7xxx aluminum alloy product of claim 1, wherein the 7xxx aluminum alloy comprises from 0.10 to 0.50 wt. % Mn.

### Claim 9 (depends on 1)

The wrought 7xxx aluminum alloy product of claim 1, wherein the 7xxx aluminum alloy comprises not greater than 0.01 wt. % Mn.

### Claim 10 (depends on 1)

The wrought 7xxx aluminum alloy product of claim 1, wherein the at least one grain structure control material is at least chromium, and wherein the 7xxx aluminum alloy comprises from 0.05 to 0.24 wt. % Cr.

### Claim 11 (depends on 1)

The wrought 7xxx aluminum alloy product of claim 1, wherein the 7xxx aluminum alloy comprises not greater than 0.01 wt. % Cr.

### Claim 12 (depends on 1)

The wrought 7xxx aluminum alloy product of claim 1, wherein the 7xxx aluminum alloy includes from 0.010 to 0.10 wt. % Ti.

### Claim 13 (depends on 1)

The wrought 7xxx aluminum alloy product of claim 1, wherein the grain structure control material is at least Zr, and wherein the alloy includes 0.05 to 0.20 wt. % Zr.

### Claim 14 (depends on 1)

The wrought 7xxx aluminum alloy product of claim 1, wherein the wrought aluminum alloy product realizes a typical tensile yield strength (ST) of at least 400 MPa in a T7 temper.

### Claim 15 (depends on 14)

The wrought 7xxx aluminum alloy product of claim 14, wherein the wrought aluminum alloy product realizes a plane-strain (KIC) fracture toughness (S-L) of at least 20 MPa-sqrt-m in a T7 temper.

### Claim 16 (depends on 15)

The wrought 7xxx aluminum alloy product of claim 15, wherein the wrought aluminum alloy product realizes an elongation (ST) of at least 2.0% in a T7 temper.

### Claim 17 (depends on 16)

The wrought 7xxx aluminum alloy product of claim 16, wherein the wrought aluminum alloy product passes HHSCC-G49 testing at 70° C. at 100 days or at 90° C. for 10 days.

### Claim 18 (depends on 17)

The wrought 7xxx aluminum alloy product of claim 17, wherein the wrought aluminum alloy product passes SCC alternate immersion testing at 20 days and a net stress (ST) of 172 MPa.

### Claim 19 (depends on 18)

The wrought 7xxx aluminum alloy product of claim 18, wherein the wrought aluminum alloy product passes HHSCC-G168, wherein the stress intensity factor gives a crack growth rate of not greater than 10−7 mm/s, and wherein the realized K value is at least 13 MPa-sqrt-m (MPa√m).