AL-ZN-CU-MG ALLOYS AND THEIR MANUFACTURING PROCESS
First Claim
1. An extruded, rolled and/or forged aluminum-based alloy product having a thickness of at least 25 mm comprising, or advantageously consisting of (in weight %):
- Zn 6.70-7.40Mg 1.50-1.80Cu 2.20-2.60, wherein the Cu to Mg ratio is at least 1.30Zr 0.04-0.14Mn 0-0.5Ti 0-0.15V 0-0.15Cr 0-0.25Fe 0-0.15Si 0-0.15impurities ≤
0.05 each and ≤
0.15 total.
1 Assignment
0 Petitions
Accused Products
Abstract
The invention concerns an extruded, rolled and/or forged aluminum-based alloy product having a thickness of at least 25 mm comprising (in weight %): Zn 6.70-7.40; Mg 1.50-1.80; Cu 2.20-2.60, with a Cu to Mg ratio of at least 1.30; Zr 0.04-0.14; Mn 0-0.5; Ti 0-0.15; V 0-0.15; Cr 0-0.25; Fe 0-0.15; Si 0-0.15; impurities ≤0.05 each and ≤0.15 total. The invention also concerns a method of making such a product. Products according to the invention are particularly advantageous because they exhibit simultaneously a low sensitivity to environmentally assisted cracking under conditions of high stress and humid environment, high strength and high toughness properties.
4 Citations
16 Claims
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1. An extruded, rolled and/or forged aluminum-based alloy product having a thickness of at least 25 mm comprising, or advantageously consisting of (in weight %):
-
Zn 6.70-7.40 Mg 1.50-1.80 Cu 2.20-2.60, wherein the Cu to Mg ratio is at least 1.30 Zr 0.04-0.14 Mn 0-0.5 Ti 0-0.15 V 0-0.15 Cr 0-0.25 Fe 0-0.15 Si 0-0.15 impurities ≤
0.05 each and ≤
0.15 total. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 16)
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12. A process for manufacture of an extruded, rolled and/or forged aluminum-based alloy product comprising:
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a) casting an ingot comprising, or advantageously consisting essentially of (in weight-%) Zn 6.70-7.40 Mg 1.50-1.80 Cu 2.20-2.60, wherein the Cu to Mg ratio is at least 1.30 Zr 0.04-0.14 Mn 0-0.5 Ti 0-0.15 V 0-0.15 Cr 0-0.25 Fe 0-0.15 Si 0-0.15 impurities ≤
0.05 each and ≤
0.15 totalb) homogenizing the ingot or billet c) hot working said homogenized ingot or billet to an extruded, rolled and/or forged product with a final thickness of at least 25 mm; d) solution heat treating and quenching the product; e) stretching the product; f) artificial aging. - View Dependent Claims (13, 14, 15)
where T is the instantaneous temperature in °
K during annealing and Tref is a reference temperature selected at 155°
C. (428°
K). t(eq) is expressed in hours.
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-
14. The process according to claim 12 wherein a hot working entry temperature is comprised from about 380 to about 460°
- C. and optionally between about 400 and about 450°
C.
- C. and optionally between about 400 and about 450°
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15. The process according claim 12 wherein solution heat treatment temperature is from 460 to about 510°
- C. or optionally from about 470 to about 500°
C.
- C. or optionally from about 470 to about 500°
Specification