US2015354045A1PendingUtilityA1
7XXX Series Alloy with Cu Having High Yield Strength and Improved Extrudability
Est. expiryJun 10, 2034(~7.9 yrs left)· nominal 20-yr term from priority
C22F 1/002C22F 1/053C22C 21/10
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Claims
Abstract
7000 series aluminum alloys containing copper are provided. The aluminum alloys have high yield strength, and in some aspects allow press quenchability and/or have extrusion speeds more rapid than conventional 7000 series Al alloys.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . An alloy comprising Fe from 0 to 0.08 wt %, Si from 0 to 0.05 wt %, Mg from 1.85 to 3.0 wt %, Zn from 5.0 to 6.3 wt %, and Cu from 0.9 to 2.15 wt %, the remaining wt % being Al and incidental impurities.
2 . The alloy of claim 1 , comprising Mg from 1.95 to 2.9 wt %, Zn from 5.1 to 6.3 wt %, and Cu from 1.0 to 2.05 wt %.
3 . The alloy of claim 1 , comprising at least 0.01 wt % Fe and at least 0.01 wt % Si.
4 . The alloy of claim 1 , wherein the tensile yield strength of the alloy is greater than 450 MPa.
5 . The alloy of claim 1 , wherein the thermal conductivity of the alloy is less than 150 W/mK.
6 . The alloy of claim 1 , comprising Mg from 1.90 to 2.00 wt %, Zn from 5.4 to 5.6 wt %, and Cu from 0.75 to 1.25 wt %.
7 . The alloy of claim 6 , comprising at least 0.01 wt % Fe and at least 0.01 wt % Si.
8 . The alloy of claim 6 , wherein the tensile yield strength is greater than 450 MPa.
9 . The alloy of claim 10 , wherein the tensile yield strength of the alloy is greater than 500 MPa.
10 . The alloy of claim 10 , wherein the tensile yield strength of the alloy is greater than 525 MPa.
11 . The alloy of claim 1 , comprising Mg from 2.25 to 2.35 wt %, Zn from 6.2 to 6.4 wt %, and Cu from 1.80 to 2.30 wt %.
12 . The alloy of claim 10 , comprising at least 0.01 wt % Fe and at least 0.01 wt % Si.
13 . An alloy comprising Fe from 0 to 0.50 wt %, Si from 0 to 0.40 wt %, Mg from 2.0 to 3.0 wt %, Zn from 5.0 to 6.2 wt %, and Cu from 1.0 to 2.25 wt %, the remaining wt % being Al and incidental impurities.
14 . The alloy of claim 15 , comprising Fe from 0 to 0.50 wt %, Si from 0 to 0.40 wt %, Mg from 2.1 to 2.9 wt %, Zn from 5.1 to 6.1 wt %, and Cu from 1.2 to 2.0 wt %.
15 . The alloy of claim 10 , comprising at least 0.01 wt % Fe and at least 0.01 wt % Si.
16 . A method of making an aluminum alloy of claim 1 , comprising:
homogenizing the alloy to form a homogeneous alloy; extruding the homogenized alloy to form an extruded alloy at an extrusion temperature; and press quenching the extruded alloy before the temperature of the extruded alloy changes by 100 degrees ° C. to form the aluminum alloy having a tensile yield strength greater than 450 MPa.
17 . The method of claim 16 , wherein the alloy comprises Mg from 1.90 to 2.00 wt %, Zn from 5.4 to 5.6 wt %, and Cu from 0.75 to 1.25 wt %, the remaining wt % being Al and incidental impurities.
18 . The method of claim 17 , wherein the alloy comprises at least 0.01 wt % Fe and at least 0.01 wt % Si.
19 . The method of claim 16 , wherein the extrusion speed is less than 5 m/min.
20 . The method of claim 16 , wherein the extrusion speed is less than 2 m/min.Join the waitlist — get patent alerts
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