US2017002448A1PendingUtilityA1
Aluminum alloy combining high strength and extrudability, and low quench sensitivity
Est. expiryNov 27, 2033(~7.4 yrs left)· nominal 20-yr term from priority
C22C 21/08B21C 23/002C22F 1/047C22C 21/02C22F 1/05
50
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Claims
Abstract
An aluminum alloy includes, in weight percent, 0.70-0.85 Si, 0.14-0.25 Fe, 0.25-0.35 Cu, 0.02-0.08 Mn, 0.75-0.90 Mg, 0.04-0.08 Cr, 0.05 max Zn, and 0.04 max Ti, the balance being aluminum and unavoidable impurities. The minimum Mn content may be 0.03 wt. %, and/or the maximum Mn content may be 0.06 wt. %, in various configurations. The alloy may be suitable for extruding, and may be formed into an extruded alloy product.
Claims
exact text as granted — not AI-modified1 . An aluminum alloy comprising, in weight percent:
Si:
0.70-0.85
Fe:
0.14-0.25
Cu:
0.25-0.35
Mn:
0.02-0.08
Mg:
0.75-0.90
Cr:
0.04-0.08
Zn:
0.05 max
Ti:
0.04 max
the balance being aluminum and unavoidable impurities.
2 . The alloy of claim 1 , wherein the Si content of the alloy is 0.74-0.82 weight percent.
3 . The alloy of claim 1 , wherein the Fe content of the alloy is 0.14-0.20 weight percent.
4 . The alloy of claim 1 , wherein the Cu content of the alloy is 0.25-0.30 weight percent.
5 . The alloy of claim 1 , wherein the Mg content of the alloy is 0.78-0.86 weight percent.
6 . The alloy of claim 1 , wherein the Ti content of the alloy is 0.003-0.04 weight percent.
7 . The alloy of claim 1 , wherein the unavoidable impurities may each be present at a maximum weight percent of 0.05, and the maximum total weight percent of the unavoidable impurities is 0.15.
8 . The alloy of claim 1 , wherein the Mn content of the alloy is 0.03-0.08 weight percent.
9 . The alloy of claim 1 , wherein the Mn content of the alloy is 0.03-0.06 weight percent.
10 . (canceled)
11 . An extruded aluminum alloy product formed of the alloy of claim 1 .
12 .- 16 . (canceled)
17 . A method of forming an extruded product, comprising:
extruding a billet of an aluminum alloy to form the extruded product, the alloy comprising, in weight percent:
Si:
0.70-0.85
Fe:
0.14-0.25
Cu:
0.25-0.35
Mn:
0.02-0.08
Mg:
0.75-0.90
Cr:
0.04-0.08
Zn:
0.05 max
Ti:
0.04 max
the balance being aluminum and unavoidable impurities; and
quenching the extruded product after extrusion at a rate of 10° C./sec or less.
18 . The method of claim 17 , wherein at least 90% of the extruded product undergoes recrystallization after the extrusion.
19 . The method of claim 18 , wherein the extruded product has a tensile yield strength of at least about 260 MPa and a tensile elongation of at least about 8%.
20 . The method of claim 19 , wherein 100% of the extruded product undergoes recrystallization after the extrusion.
21 . The method of claim 17 , wherein the extrusion is performed to create a smallest cross-sectional thickness of up to 6.3 mm in the extruded product.
22 . The method of claim 17 , further comprising homogenizing the alloy prior to extruding.
23 . The method of claim 22 , wherein the homogenizing is performed at 540-580° C. for 2-8 hours, and the alloy is then cooled at a rate of 150-800° C./hr after homogenization.
24 . The method of claim 17 , wherein the quenching comprises forced air cooling or forced air quenching.
25 . The method of claim 17 , further comprising artificially aging the alloy after quenching.
26 . The method of claim 17 , wherein the rate of quenching is 5° C./sec or less, wherein at least 90% of the extruded product undergoes recrystallization after the extrusion, and wherein the extruded product has a tensile yield strength of at least about 260 MPa and a tensile elongation of at least about 8%.Join the waitlist — get patent alerts
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