EP3294917A1 - Verbesserte dicke knetlegierungen aus 7xxx-aluminium und verfahren zur herstellung davon - Google Patents

Verbesserte dicke knetlegierungen aus 7xxx-aluminium und verfahren zur herstellung davon

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Publication number
EP3294917A1
EP3294917A1 EP16793338.1A EP16793338A EP3294917A1 EP 3294917 A1 EP3294917 A1 EP 3294917A1 EP 16793338 A EP16793338 A EP 16793338A EP 3294917 A1 EP3294917 A1 EP 3294917A1
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EP
European Patent Office
Prior art keywords
aluminum alloy
max
alloy product
dev
7xxx aluminum
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP16793338.1A
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English (en)
French (fr)
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EP3294917A4 (de
EP3294917B1 (de
Inventor
Julien Boselli
Jen C. Lin
Mark A. James
Gary H. Bray
John R. Brockenbrough
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Arconic Technologies LLC
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Arconic Inc
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Priority to EP22158417.0A priority Critical patent/EP4074851A1/de
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/10—Alloys based on aluminium with zinc as the next major constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • B22D7/005—Casting ingots, e.g. from ferrous metals from non-ferrous metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/053—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with zinc as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon

Definitions

  • the present patent application relates to improved thick wrought 7xxx aluminum alloy products, and methods for producing the same.
  • the new thick wrought 7xxx aluminum alloy products may realize an improved combination of crack deviation resistance and at least one of strength, elongation, fracture toughness, and corrosion resistance, among other properties.
  • the new thick wrought 7xxx aluminum alloy products generally contain 0.080 - 0.250 wt. % Cr and have a nominal thickness of from 3.0 to 12.0 inches (7.62 - 30.48 cm).
  • the new thick wrought 7xxx aluminum alloys also generally contain 6.0 - 10.0 wt. % Zn, 1.3 - 2.3 wt. % Mg, and 1.2 - 2.6 wt. % Cu.
  • the new thick wrought 7xxx aluminum alloys may contain up to 0.50 wt. % Mn, up to 0.15 wt. % Zr, up to 0.15 wt. % Ti, up to 0.15 wt. % Si, and up to 0.15 wt.
  • a new wrought 7xxx aluminum alloy product includes 0.080 - 0.250 wt. % Cr and 0.07 - 0.15 wt. % Zr.
  • a new wrought 7xxx aluminum alloy product includes 0.080 - 0.250 wt. % Cr and 0.15 - 0.50 wt. % Mn.
  • a new wrought 7xxx aluminum alloy product includes 0.080 - 0.250 wt. % Cr, 0.15 - 0.50 wt. % Mn, and 0.07 - 0.15 wt. % Zr.
  • the new thick wrought 7xxx aluminum alloy products generally contain a sufficient amount of chromium to obtain improved crack deviation resistance properties as compared to an equivalent 7xxx aluminum alloy product having not greater than 0.01 wt. % Cr and not greater than 0.02 wt. % Mn.
  • an“equivalent 7xxx aluminum alloy product” is of an equivalent composition, form, thickness and temper as the new thick wrought 7xxx aluminum alloy product, but contains not greater than 0.01 wt. % Cr and not greater than 0.02 wt. % Mn.
  • an improved new thick wrought 7xxx aluminum alloy according to the invention would have an equivalent composition to the conventional 7085 aluminum alloy plate product, but would also include 0.080 - 0.250 wt. % Cr, optionally with 0.07 - 0.15 wt. % Zr and/or 0.15 - 0.50 wt. % Mn, as provided below.
  • Such an improved new thick wrought 7xxx aluminum alloy accordingly would also be a plate product, would have a nominal thickness of 5.00 inches, and would also be artificially aged to achieve a typical tensile yield strength (L) of about 70 ksi.
  • the improved new thick wrought 7xxx aluminum alloy would achieve at least 5% better (higher) typical L-S crack deviation resistance K max-dev at a strength of 70 ksi as compared to the conventional 7085 aluminum alloy plate product, and at least partially due to the use of chromium, optionally with manganese and/or zirconium.
  • Mn can partially substitute for Cr in E phase but will also likely form separate dispersoid phases (e.g., Al 6 Mn, Al 12 (Mn,Fe) 3 Si].
  • Such dispersoids are believed to help keep the fatigue crack stay in plane through void initiation and growth ahead of the crack-tip.
  • Zirconium forms Al 3 Zr, which, in combination with the E phase and/or Mn-containing dispersoids, may further facilitate improved crack deviation resistance.
  • a new thick wrought 7xxx aluminum alloy product realizes at least a 10% improvement in typical L-S crack deviation resistance K max-dev as compared to an equivalent 7xxx aluminum alloy product having not greater than 0.01 wt. % Cr and not greater than 0.02 wt. % Mn, at equivalent strength.
  • a new thick wrought 7xxx aluminum alloy product realizes at least a 12% improvement in typical L-S crack deviation resistance K max-dev as compared to an equivalent 7xxx aluminum alloy product having not greater than 0.01 wt. % Cr and not greater than 0.02 wt. % Mn, at equivalent strength.
  • a new thick wrought 7xxx aluminum alloy product realizes at least a 14% improvement in typical L-S crack deviation resistance K max-dev as compared to an equivalent 7xxx aluminum alloy product having not greater than 0.01 wt. % Cr and not greater than 0.02 wt. % Mn, at equivalent strength.
  • a new thick wrought 7xxx aluminum alloy product realizes at least a 16% improvement in typical L-S crack deviation resistance K max- dev as compared to an equivalent 7xxx aluminum alloy product having not greater than 0.01 wt. % Cr and not greater than 0.02 wt. % Mn, at equivalent strength.
  • a new thick wrought 7xxx aluminum alloy product realizes at least a 18% improvement in typical L-S crack deviation resistance K max-dev as compared to an equivalent 7xxx aluminum alloy product having not greater than 0.01 wt. % Cr and not greater than 0.02 wt. % Mn, at equivalent strength.
  • a new thick wrought 7xxx aluminum alloy product realizes at least a 20% improvement in typical L-S crack deviation resistance K max-dev as compared to an equivalent 7xxx aluminum alloy product having not greater than 0.01 wt. % Cr and not greater than 0.02 wt. % Mn, at equivalent strength.
  • a new thick wrought 7xxx aluminum alloy product realizes at least a 22% improvement in typical L-S crack deviation resistance K max- dev as compared to an equivalent 7xxx aluminum alloy product having not greater than 0.01 wt. % Cr and not greater than 0.02 wt. % Mn, at equivalent strength.
  • a new thick wrought 7xxx aluminum alloy product realizes at least a 24% improvement in typical L-S crack deviation resistance K max-dev as compared to an equivalent 7xxx aluminum alloy product having not greater than 0.01 wt. % Cr and not greater than 0.02 wt. % Mn, at equivalent strength.
  • a new thick wrought 7xxx aluminum alloy product realizes at least a 26% improvement in typical L-S crack deviation resistance K max-dev as compared to an equivalent 7xxx aluminum alloy product having not greater than 0.01 wt. % Cr and not greater than 0.02 wt. % Mn, at equivalent strength.
  • a new thick wrought 7xxx aluminum alloy product realizes at least a 28% improvement in typical L-S crack deviation resistance K max- dev as compared to an equivalent 7xxx aluminum alloy product having not greater than 0.01 wt. % Cr and not greater than 0.02 wt. % Mn, at equivalent strength.
  • a new thick wrought 7xxx aluminum alloy product realizes at least a 30% improvement in typical L-S crack deviation resistance K max-dev as compared to an equivalent 7xxx aluminum alloy product having not greater than 0.01 wt. % Cr and not greater than 0.02 wt. % Mn, at equivalent strength.
  • a new thick wrought 7xxx aluminum alloy product may realize at least equivalent L-T plane strain fracture toughness to the equivalent 7xxx aluminum alloy product having not greater than 0.01 wt. % Cr and not greater than 0.02 wt. % Mn, at equivalent strength.
  • a new thick wrought 7xxx aluminum alloy product may realize at least equivalent corrosion resistance (e.g., stress corrosion cracking resistance, exfoliation corrosion resistance) to the equivalent 7xxx aluminum alloy product having not greater than 0.01 wt. % Cr and not greater than 0.02 wt. % Mn, at equivalent strength.
  • equivalent corrosion resistance e.g., stress corrosion cracking resistance, exfoliation corrosion resistance
  • chromium may facilitate improved crack deviation resistance properties.
  • too much chromium may result in unnecessary degradation of strength and/or fracture toughness.
  • the amount of chromium in the new thick wrought 7xxx aluminum alloy products may be limited to facilitate achievement of the improved combination of properties described herein.
  • the amount of chromium required to achieve the improved combination of properties may vary over the different types of 7xxx alloys described herein (e.g., due to magnesium content), but the amount of chromium required generally falls within the range of 0.080 to 0.250 wt. % Cr, keeping in mind to limit the amount of chromium so as to avoid coarse chromium particles.
  • the new thick wrought 7xxx aluminum alloy product includes an amount of chromium (in weight percent) falling within the scope of the following equations:
  • the wrought 7xxx aluminum alloy product may include up to 0.15 wt. % Zr (e.g., 0.07 - 0.15 wt. % Zr).
  • a new thick wrought 7xxx aluminum alloy product includes from 0.09 to 0.13 wt. % Zr.
  • a new thick wrought 7xxx aluminum alloy product includes from 0.09 to 0.11 wt. % Zr.
  • a new thick wrought 7xxx aluminum alloy product includes from 0.10 to 0.12 wt. % Zr.
  • a new thick wrought 7xxx aluminum alloy product includes from 0.07 to 0.09 wt. % Zr.
  • a new thick wrought 7xxx aluminum alloy product includes from 0.11 to 0.13 wt. % Zr.
  • the new thick wrought 7xxx aluminum alloy products are essentially free of zirconium, containing not greater than 0.03 wt. % Zr, or not greater than 0.01 wt. % Zr, or not greater than 0.005 wt. % Zr, or not greater than 0.001 wt. % Zr.
  • the new thick wrought 7xxx aluminum alloy product may include up to 0.50 wt. % Mn.
  • the amount of Mn should be limited so as to avoid detrimentally impacting the combination of strength, fracture toughness and crack deviation resistance.
  • some manganese may be included in the new thick wrought 7xxx aluminum alloy product.
  • a new thick wrought 7xxx aluminum alloy product includes from 0.15 to 0.50 wt. % Mn.
  • a new thick wrought 7xxx aluminum alloy product includes from 0.20 to 0.50 wt. % Mn.
  • a new thick wrought 7xxx aluminum alloy product includes from 0.25 to 0.45 wt. % Mn.
  • the new thick wrought 7xxx aluminum alloy product includes not greater than 0.15 wt. % Mn, such as not greater than 0.10 wt. % Mn, or not greater than 0.05 wt. % Mn, or not greater than 0.02 wt. % Mn.
  • the new thick wrought 7xxx aluminum alloy products generally contain an amount of chromium sufficient to obtain a typical L-S crack deviation resistance K max-dev of at least 34 ksi ⁇ in. as measured on a rolled 5.00 inch version of the wrought 7xxx aluminum alloy product in the T7451 or T7651 temper, and at least equivalent strength to that of an equivalent 7xxx aluminum alloy product having not greater than 0.01 wt. % Cr and not greater than 0.02 wt. % Mn.
  • the new thick wrought 7xxx aluminum alloy products contain an amount of the chromium sufficient to obtain a typical L-S crack deviation resistance K max-dev of at least 35 ksi ⁇ in.
  • the new thick wrought 7xxx aluminum alloy products contain an amount of the chromium sufficient to obtain a typical L-S crack deviation resistance K max-dev of at least 36 ksi ⁇ in. as measured on a rolled 5.00 inch version of the wrought 7xxx aluminum alloy product in the T7451 or T7651 temper, and at least equivalent strength to that of an equivalent 7xxx aluminum alloy product having not greater than 0.01 wt.
  • the new thick wrought 7xxx aluminum alloy products contain an amount of the chromium sufficient to obtain a typical L-S crack deviation resistance K max-dev of at least 37 ksi ⁇ in. as measured on a rolled 5.00 inch version of the wrought 7xxx aluminum alloy product in the T7451 or T7651 temper, and at least equivalent strength to that of an equivalent 7xxx aluminum alloy product having not greater than 0.01 wt. % Cr and not greater than 0.02 wt. % Mn.
  • the new thick wrought 7xxx aluminum alloy products contain an amount of the chromium sufficient to obtain a typical L-S crack deviation resistance K max-dev of at least 38 ksi ⁇ in. as measured on a rolled 5.00 inch version of the wrought 7xxx aluminum alloy product in the T7451 or T7651 temper, and at least equivalent strength to that of an equivalent 7xxx aluminum alloy product having not greater than 0.01 wt. % Cr and not greater than 0.02 wt. % Mn.
  • the new thick wrought 7xxx aluminum alloy products contain an amount of the chromium sufficient to obtain a typical L-S crack deviation resistance K max-dev of at least 39 ksi ⁇ in.
  • the new thick wrought 7xxx aluminum alloy products contain an amount of the chromium sufficient to obtain a typical L-S crack deviation resistance K max-dev of at least 40 ksi ⁇ in. as measured on a rolled 5.00 inch version of the wrought 7xxx aluminum alloy product in the T7451 or T7651 temper, and at least equivalent strength to that of an equivalent 7xxx aluminum alloy product having not greater than 0.01 wt.
  • the new thick wrought 7xxx aluminum alloy products contain an amount of the chromium sufficient to obtain a typical L-S crack deviation resistance K max-dev of at least 41 ksi ⁇ in. as measured on a rolled 5.00 inch version of the wrought 7xxx aluminum alloy product in the T7451 or T7651 temper, and at least equivalent strength to that of an equivalent 7xxx aluminum alloy product having not greater than 0.01 wt. % Cr and not greater than 0.02 wt. % Mn.
  • the new thick wrought 7xxx aluminum alloy products contain an amount of the chromium sufficient to obtain a typical L-S crack deviation resistance K max-dev of at least 42 ksi ⁇ in. as measured on a rolled 5.00 inch version of the wrought 7xxx aluminum alloy product in the T7451 or T7651 temper, and at least equivalent strength to that of an equivalent 7xxx aluminum alloy product having not greater than 0.01 wt. % Cr and not greater than 0.02 wt. % Mn.
  • a new thick wrought 7xxx aluminum alloy product contains an amount of the chromium sufficient to obtain a typical L-S crack deviation resistance K max-dev of at least 43 ksi ⁇ in.
  • a new thick wrought 7xxx aluminum alloy product contains an amount of the chromium sufficient to obtain a typical L-S crack deviation resistance K max-dev of at least 44 ksi ⁇ in. as measured on a rolled 5.00 inch version of the wrought 7xxx aluminum alloy product in the T7451 or T7651 temper, and at least equivalent strength to that of an equivalent 7xxx aluminum alloy product having not greater than 0.01 wt.
  • a new thick wrought 7xxx aluminum alloy product contains an amount of the chromium sufficient to obtain a typical L-S crack deviation resistance K max-dev of at least 45 ksi ⁇ in. as measured on a rolled 5.00 inch version of the wrought 7xxx aluminum alloy product in the T7451 or T7651 temper, and at least equivalent strength to that of an equivalent 7xxx aluminum alloy product having not greater than 0.01 wt. % Cr and not greater than 0.02 wt. % Mn.
  • a new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize all of (a) a typical L-S crack deviation resistance K max-dev (L-S K max-dev ) of at least 34 ksi ⁇ in, (b) a typical L tensile yield strength (TYS(L)) of at least 60 ksi, and (c) a typical L-T plane strain K IC fracture toughness of at least 19 ksi ⁇ in. relative to (as measured on) a rolled 5.00 inch version of the wrought 7xxx aluminum alloy product in the T7451 or T7651 temper.
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 92.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 93.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 93.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 94.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 94.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 95.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 95.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 96.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 96.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 97.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 97.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 98.11, where x is the TYS(L) and y is the L-S K K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 98.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 99.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 99.61, where x is the TYS(L) and y is the L-S K max-dev .
  • TYS(L) typical L tensile yield strength
  • IC fracture toughness of at least 19 ksi ⁇ in.
  • the amount of Zn, Mg and Cu in the new thick wrought 7xxx aluminum alloy product is 6.0 - 10.0 wt. % Zn, 1.3 - 2.3 wt. % Mg, and 1.2 - 2.6 wt. % Cu, and further the amount of Zn, Mg and Cu in the new thick wrought 7xxx aluminum alloy product is selected to comply with (and does contain / comply with) the boundaries of equations (3) and (4), below.
  • Equation (3) Equation (3) is:
  • Zn, Mg, and Cu are the amount of the Zn, the Mg and the Cu contained in the new thick wrought 7xxx aluminum alloy product, and wherein the equation (3) coefficients are:
  • Equation (4) is:
  • the new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize all of (a) a typical L-S crack deviation resistance K max-dev of at least 34 ksi ⁇ in, (b) a typical L tensile yield strength of at least 63 ksi, and (c) a typical L-T plane strain K IC fracture toughness of at least 21 ksi ⁇ in. relative to (as measured on) a rolled 5.00 inch version of the wrought 7xxx aluminum alloy product in the T7451 or T7651 temper.
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 92.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 93.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 93.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 94.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 94.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 95.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 95.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 96.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 96.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 97.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 97.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 98.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 98.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 99.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 99.61, where x is the TYS(L) and y is the L-S K max-dev .
  • TYS(L) typical L tensile yield strength
  • IC fracture toughness of at least 21 ksi ⁇ in.
  • the amount of Zn, Mg and Cu in the new thick wrought 7xxx aluminum alloy product is 6.0 - 10.0 wt. % Zn, 1.3 - 2.3 wt. % Mg, and 1.2 - 2.6 wt. % Cu, and further the amount of Zn, Mg and Cu in the new thick wrought 7xxx aluminum alloy product is selected to comply with (and does contain / comply with) the boundaries of equations (5) and (6), below.
  • Equation (5) is:
  • Zn, Mg, and Cu are the amount of the Zn, the Mg and the Cu contained in the new thick wrought 7xxx aluminum alloy product, and wherein the equation (5) coefficients are:
  • Equation (6) is:
  • the new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize all of (a) a typical L-S crack deviation resistance K max-dev of at least 34 ksi ⁇ in, (b) a typical L tensile yield strength of at least 66 ksi, and (c) a typical L-T plane strain K IC fracture toughness of at least 21 ksi ⁇ in. relative to a rolled 5.00 inch version of the wrought 7xxx aluminum alloy product in the T7451 or T7651 temper.
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 92.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 93.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 93.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 94.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 94.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 95.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 95.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 96.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 96.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 97.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 97.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 98.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 98.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 99.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 99.61, where x is the TYS(L) and y is the L-S K max-dev .
  • TYS(L) typical L tensile yield strength
  • IC fracture toughness of at least 21 ksi ⁇ in.
  • the amount of Zn, Mg and Cu in the new thick wrought 7xxx aluminum alloy product is 6.0 - 10.0 wt. % Zn, 1.3 - 2.3 wt. % Mg, and 1.2 - 2.6 wt. % Cu, and further the amount of Zn, Mg and Cu in the new thick wrought 7xxx aluminum alloy product is selected to comply with (and does contain / comply with) the boundaries of equations (7) and (8), below.
  • Equation (7) is:
  • Zn, Mg, and Cu are the amount of the Zn, the Mg and the Cu contained in the new thick wrought 7xxx aluminum alloy product, and wherein the equation (7) coefficients are:
  • Equation (8) is:
  • the new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize all of (a) a typical L-S crack deviation resistance K max-dev of at least 34 ksi ⁇ in, (b) a typical L tensile yield strength of at least 66 ksi, and (c) a typical L-T plane strain K IC fracture toughness of at least 24 ksi ⁇ in. relative to a rolled 5.00 inch version of the wrought 7xxx aluminum alloy product in the T7451 or T7651 temper.
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 92.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 93.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 93.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 94.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 94.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 95.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 95.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 96.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 96.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 97.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 97.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 98.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 98.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 99.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 99.61, where x is the TYS(L) and y is the L-S K max-dev .
  • TYS(L) typical L tensile yield strength
  • IC fracture toughness of at least 24 ksi ⁇ in.
  • the amount of Zn, Mg and Cu in the new thick wrought 7xxx aluminum alloy product is 6.0 - 10.0 wt. % Zn, 1.3 - 2.3 wt. % Mg, and 1.2 - 2.6 wt. % Cu, and further the amount of Zn, Mg and Cu in the new thick wrought 7xxx aluminum alloy product is selected to comply with (and does contain / comply with) the boundaries of equations (9) and (10), below.
  • Equation (9) is:
  • Zn, Mg, and Cu are the amount of the Zn, the Mg and the Cu contained in the new thick wrought 7xxx aluminum alloy product, and wherein the equation (9) coefficients are:
  • Equation (10) is:
  • the new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize all of (a) a typical L-S crack deviation resistance K max-dev of at least 34 ksi ⁇ in, (b) a typical L tensile yield strength of at least 68 ksi, and (c) a typical L-T plane strain K IC fracture toughness of at least 27 ksi ⁇ in. relative to a rolled 5.00 inch version of the wrought 7xxx aluminum alloy product in the T7451 or T7651 temper.
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 92.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 93.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 93.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 94.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 94.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 95.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 95.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 96.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 96.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 97.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 97.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 98.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 98.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 99.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 99.61, where x is the TYS(L) and y is the L-S K max-dev .
  • TYS(L) typical L tensile yield strength
  • IC fracture toughness of at least 27 ksi ⁇ in.
  • the amount of Zn, Mg and Cu in the new thick wrought 7xxx aluminum alloy product is 6.0 - 10.0 wt. % Zn, 1.3 - 2.3 wt. % Mg, and 1.2 - 2.6 wt. % Cu, and further the amount of Zn, Mg and Cu in the new thick wrought 7xxx aluminum alloy product is selected to comply with (and does contain / comply with) the boundaries of equations (11) and (12), below.
  • Equation (11) is:
  • Equation (12) is:
  • the new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize all of (a) a typical L-S crack deviation resistance K max-dev of at least 34 ksi ⁇ in, (b) a typical L tensile yield strength of at least 70 ksi, and (c) a typical L-T plane strain K IC fracture toughness of at least 29 ksi ⁇ in. relative to a rolled 5.00 inch version of the wrought 7xxx aluminum alloy product in the T7451 or T7651 temper.
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 92.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 93.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 93.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 94.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 94.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 95.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 95.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 96.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 96.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 97.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 97.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 98.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 98.61, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 99.11, where x is the TYS(L) and y is the L-S K max-dev .
  • this new thick wrought 7xxx aluminum alloy product contains an amount of the Zn, Mg, Cu and Cr sufficient to realize the above strength and crack deviation properties and such that the realized L-S K max-dev and TYS(L) satisfy the expression y ⁇ -0.8184x + 99.61, where x is the TYS(L) and y is the L-S K max-dev .
  • TYS(L) typical L tensile yield strength
  • IC fracture toughness of at least 29 ksi ⁇ in.
  • the amount of Zn, Mg and Cu in the new thick wrought 7xxx aluminum alloy product is 6.0 - 10.0 wt. % Zn, 1.3 - 2.3 wt. % Mg, and 1.2 - 2.6 wt. % Cu, and further the amount of Zn, Mg and Cu in the new thick wrought 7xxx aluminum alloy product is selected to comply with (and does contain / comply with) the boundaries of equations (13) and (14), below.
  • Equation (13) is:
  • Zn, Mg, and Cu are the amount of the Zn, the Mg and the Cu contained in the new thick wrought 7xxx aluminum alloy product, and wherein the equation (13) coefficients are:
  • Equation (14) is:
  • the new thick wrought 7xxx aluminum alloy product may include up to 0.15 wt. % Ti. Titanium may be used to facilitate grain refining during casting, such as by using TiB 2 or TiC. Elemental titanium may also or alternatively be used. In one embodiment, the new thick wrought 7xxx aluminum alloy product includes from 0.005 to 0.025 wt. % Ti.
  • the new thick wrought 7xxx aluminum alloy product may include up to 0.15 wt. % Si and up to 0.15 wt. % Fe as impurities.
  • the amount of silicon and iron may be limited so as to avoid detrimentally impacting the combination of strength, fracture toughness and crack deviation resistance.
  • the new thick wrought 7xxx aluminum alloy product may include up to 0.10 wt. % Si and up to 0.12 wt. % Fe as impurities.
  • the new thick wrought 7xxx aluminum alloy product may include up to 0.08 wt. % Si and up to 0.10 wt. % Fe as impurities.
  • the new thick wrought 7xxx aluminum alloy product may include up to 0.06 wt. % Si and up to 0.08 wt. % Fe as impurities. In yet another embodiment, the new thick wrought 7xxx aluminum alloy product may include up to 0.04 wt. % Si and up to 0.06 wt. % Fe as impurities. In another embodiment, the new thick wrought 7xxx aluminum alloy product may include up to 0.03 wt. % Si and up to 0.05 wt. % Fe as impurities.
  • the new thick wrought 7xxx aluminum alloy product has a thickness of from 3.0 to 12.0 inches (7.62 - 30.48 cm). In one embodiment, the new thick wrought 7xxx aluminum alloy product has a thickness of from 3.0 to 10.0 inches (7.62 - 25.4 cm). In another embodiment, the new thick wrought 7xxx aluminum alloy product has a thickness of from 3.0 to 8.0 inches (7.62 - 20.3 cm). In yet another embodiment, the new thick wrought 7xxx aluminum alloy product has a thickness of from 3.0 to 6.0 inches (7.62 - 15.24 cm). In another embodiment, the new thick wrought 7xxx aluminum alloy product has a thickness of from 3.0 to 5.0 inches (7.62 - 12.7 cm).
  • the new thick wrought 7xxx aluminum alloy product has a thickness of from 4.0 to 12.0 inches (10.16 - 30.48 cm). In one embodiment, the new thick wrought 7xxx aluminum alloy product has a thickness of from 4.0 to 10.0 inches (10.16 - 25.4 cm). In another embodiment, the new thick wrought 7xxx aluminum alloy product has a thickness of from 4.0 to 8.0 inches (10.16 - 20.3 cm). In yet another embodiment, the new thick wrought 7xxx aluminum alloy product has a thickness of from 4.0 to 6.0 inches (10.16 - 15.24 cm). In another embodiment, the new thick wrought 7xxx aluminum alloy product has a thickness of from 4.0 to 5.0 inches (10.16 - 12.7 cm).
  • the new thick wrought 7xxx aluminum alloy product has a thickness of from 5.0 to 12.0 inches (12.7 - 30.48 cm). In one embodiment, the new thick wrought 7xxx aluminum alloy product has a thickness of from 5.0 to 10.0 inches (12.7 - 25.4 cm). In another embodiment, the new thick wrought 7xxx aluminum alloy product has a thickness of from 5.0 to 8.0 inches (12.7 - 20.3 cm). In yet another embodiment, the new thick wrought 7xxx aluminum alloy product has a thickness of from 5.0 to 6.0 inches (12.7 - 15.24 cm).
  • a new thick wrought 7xxx aluminum alloy product is a rolled product.
  • a new thick wrought 7xxx aluminum alloy product is an extruded product.
  • a new thick wrought 7xxx aluminum alloy product is a forged product (e.g., a hand forged product, a die forged product).
  • the new 7xxx aluminum alloy is a 7085 alloy (as defined by the Aluminum Association Teal Sheets document, described below) modified to include 0.080 to 0.250 wt. % Cr.
  • the chromium is a substitute for (in whole or in part) the 0.08 - 0.15 wt. % Zr specified in alloy 7085.
  • the new 7085 alloy includes chromium within the Cr (min) and Cr (max) limits, described above.
  • the new 7085 alloy includes 0.104 - 0.250 wt. % Cr and at least one of (a) 0.07 - 0.15 wt. % Zr and (b) 0.15 - 0.50 wt. % Mn.
  • the new 7085 alloy includes all of 0.104 - 0.250 wt. % Cr, 0.07 - 0.15 wt. % Zr and 0.15 - 0.50 wt. % Mn. In one embodiment, the new 7085 alloy includes from 1.40 to 1.60 wt. % Mg, and thus includes from 0.120 to 0.236 wt. % Cr. The teachings of this paragraph also apply to other 7x85 alloys, such as 7185.
  • the new 7xxx aluminum alloy is a 7065 alloy (as defined by the Aluminum Association Teal Sheets document, described below) modified to include 0.080 to 0.250 wt. % Cr.
  • the chromium is a substitute for (in whole or in part) the 0.05 - 0.15 wt. % Zr specified in alloy 7065.
  • the new 7065 alloy includes chromium within the Cr (min) and Cr (max) limits, described above.
  • the new 7065 alloy includes 0.104 - 0.228 wt. % Cr and at least one of (a) 0.07 - 0.15 wt. % Zr and (b) 0.15 - 0.50 wt. % Mn.
  • the new 7065 alloy includes all of 0.104 - 0.228 wt. % Cr, 0.07 - 0.15 wt. % Zr and 0.15 - 0.50 wt. % Mn. In one embodiment, the 7065 alloy includes from 1.55 to 1.75 wt. % Mg, and thus includes from 0.107 to 0.224 wt. % Cr. The teachings of this paragraph also apply to other 7x65 alloys.
  • the new 7xxx aluminum alloy is a 7040 alloy (as defined by the Aluminum Association Teal Sheets document, described below) modified to include 0.080 to 0.250 wt. % Cr.
  • the chromium is a substitute for (in whole or in part) the 0.05 - 0.12 wt. % Zr specified in alloy 7040.
  • the new 7040 alloy includes 0.08 - 0.228 wt. % Cr and at least one of (a) 0.07 - 0.15 wt. % Zr and (b) 0.15 - 0.50 wt. % Mn.
  • the new 7040 alloy includes all of 0.08 - 0.228 wt.
  • the new 7040 alloy includes chromium within the Cr (min) and Cr (max) limits, described above.
  • the teachings of this paragraph also apply to other 7x40 alloys, such as 7140.
  • the new 7xxx aluminum alloy is a 7050 alloy (as defined by the Aluminum Association Teal Sheets document, described below) modified to include 0.080 to 0.250 wt. % Cr.
  • the chromium is a substitute for (in whole or in part) the 0.08 - 0.15 wt. % Zr specified in alloy 7050.
  • the new 7050 alloy includes chromium within the Cr (min) and Cr (max) limits, described above.
  • the new 7050 alloy includes 0.08 - 0.193 wt. % Cr and at least one of (a) 0.07 - 0.15 wt. % Zr and (b) 0.15 - 0.50 wt. % Mn.
  • the new 7050 alloy includes all of 0.08 - 0.193 wt. % Cr, 0.07 - 0.15 wt. % Zr and 0.15 - 0.50 wt. % Mn. In one embodiment, the 7050 alloy includes from 1.95 to 2.30 wt. % Mg, and thus includes from 0.080 to 0.191 wt. % Cr. The teachings of this paragraph also apply to other 7x50 alloys, such as 7150 and 7250.
  • the new 7xxx aluminum alloy is a 7055 alloy (as defined by the Aluminum Association Teal Sheets document, described below) modified to include 0.080 to 0.250 wt. % Cr.
  • the chromium is a substitute for (in whole or in part) the 0.08 - 0.25 wt. % Zr specified in alloy 7055.
  • the new 7055 alloy includes chromium within the Cr (min) and Cr (max) limits, described above.
  • the new 7055 alloy includes 0.08 - 0.203 wt. % Cr and at least one of (a) 0.07 - 0.15 wt. % Zr and (b) 0.15 - 0.50 wt. % Mn.
  • the new 7055 alloy includes all of 0.08 - 0.203 wt. % Cr, 0.07 - 0.15 wt. % Zr and 0.15 - 0.50 wt. % Mn. In one embodiment, the 7055 alloy includes from 1.85 to 2.05 wt. % Mg, and thus includes from 0.083 to 0.200 wt. % Cr. The teachings of this paragraph also apply to other 7x50 alloys, such as 7150 and 7250.
  • the new 7xxx aluminum alloy is a 7136 alloy (as defined by the Aluminum Association Teal Sheets document, described below) modified to include 0.080 to 0.250 wt. % Cr.
  • the chromium is a substitute for (in whole or in part) the 0.10 - 0.20 wt. % Zr specified in alloy 7136.
  • the new 7136 alloy includes chromium within the Cr (min) and Cr (max) limits, described above.
  • the new 7136 alloy includes 0.08 - 0.203 wt. % Cr and at least one of (a) 0.07 - 0.15 wt. % Zr and (b) 0.15 - 0.50 wt. % Mn.
  • the new 7136 alloy includes all of 0.08 - 0.203 wt. % Cr, 0.07 - 0.15 wt. % Zr and 0.15 - 0.50 wt. % Mn.
  • the teachings of this paragraph also apply to other 7x36 alloys, such as 7036.
  • the new 7xxx aluminum alloy is a 7010 alloy (as defined by the Aluminum Association Teal Sheets document, described below) modified to include 0.080 to 0.250 wt. % Cr.
  • the chromium is a substitute for (in whole or in part) the 0.10 - 0.16 wt. % Zr specified in alloy 7010.
  • the new 7010 alloy includes chromium within the Cr (min) and Cr (max) limits, described above.
  • the new 7010 alloy includes 0.08 - 0.179 wt. % Cr and at least one of (a) 0.07 - 0.15 wt. % Zr and (b) 0.15 - 0.50 wt. % Mn.
  • the new 7010 alloy includes all of 0.08 - 0.179 wt. % Cr, 0.07 - 0.15 wt. % Zr and 0.15 - 0.50 wt. % Mn.
  • the teachings of this paragraph also apply to other 7x10 alloys.
  • the new 7xxx aluminum alloy is a 7081 alloy (as defined by the Aluminum Association Teal Sheets document, described below) modified to include 0.080 to 0.250 wt. % Cr.
  • the chromium is a substitute for (in whole or in part) the 0.06 - 0.15 wt. % Zr specified in alloy 7081.
  • the new 7081 alloy includes chromium within the Cr (min) and Cr (max) limits, described above.
  • the new 7081 alloy includes 0.08 - 0.203 wt. % Cr and at least one of (a) 0.07 - 0.15 wt. % Zr and (b) 0.15 - 0.50 wt. % Mn.
  • the new 7081 alloy includes all of 0.08 - 0.203 wt. % Cr, 0.07 - 0.15 wt. % Zr and 0.15 - 0.50 wt. % Mn.
  • the teachings of this paragraph also apply to other 7x81 alloys, such as 7181.
  • the new 7xxx aluminum alloy is a 7099 alloy (as defined by the Aluminum Association Teal Sheets document, described below) modified to include 0.080 to 0.250 wt. % Cr.
  • the chromium is a substitute for (in whole or in part) the 0.05 - 0.15 wt. % Zr specified in alloy 7099.
  • the new 7099 alloy includes chromium within the Cr (min) and Cr (max) limits, described above.
  • the new 7099 alloy includes 0.08 - 0.220 wt. % Cr and at least one of (a) 0.07 - 0.15 wt. % Zr and (b) 0.15 - 0.50 wt. % Mn.
  • the new 7099 alloy includes all of 0.08 - 0.220 wt. % Cr, 0.07 - 0.15 wt. % Zr and 0.15 - 0.50 wt. % Mn.
  • the teachings of this paragraph also apply to other 7x99 alloys, such as 7199.
  • the new 7xxx aluminum alloy is a 7449 alloy (as defined by the Aluminum Association Teal Sheets document, described below) modified to include 0.080 to 0.250 wt. % Cr.
  • the new 7449 alloy includes chromium within the Cr (min) and Cr (max) limits, described above.
  • the new 7449 alloy includes 0.08 - 0.203 wt. % Cr and at least one of (a) 0.07 - 0.15 wt. % Zr and (b) 0.15 - 0.50 wt. % Mn.
  • the new 7449 alloy includes all of 0.08 - 0.203 wt. % Cr, 0.07 - 0.15 wt. % Zr and 0.15 - 0.50 wt. % Mn.
  • the teachings of this paragraph also apply to other 7x49 alloys, such as 7049, 7149, 7249, and 7349.
  • the new 7xxx aluminum alloy is a 7075 alloy (as defined by the Aluminum Association Teal Sheets document, described below) modified to include 0.080 to 0.250 wt. % Cr.
  • the new 7075 alloy includes chromium within the Cr (min) and Cr (max) limits, described above.
  • the new 7075 alloy includes 0.08 - 0.179 wt. % Cr and at least one of (a) 0.07 - 0.15 wt. % Zr and (b) 0.15 - 0.50 wt. % Mn.
  • the new 7075 alloy includes all of 0.08 - 0.179 wt. % Cr, 0.07 - 0.15 wt. % Zr and 0.15 - 0.50 wt. % Mn.
  • the teachings of this paragraph also apply to other 7x75 alloys, such as 7175 and 7475.
  • the new 7xxx aluminum alloy is a 7097 alloy (as defined by the Aluminum Association Teal Sheets document, described below) modified to include 0.080 to 0.250 wt. % Cr.
  • the chromium is a substitute for (in whole or in part) the 0.08 - 0.15 wt. % Zr specified in alloy 7097.
  • the new 7097 alloy includes chromium within the Cr (min) and Cr (max) limits, described above.
  • the new 7075 alloy includes 0.08 - 0.220 wt. % Cr and at least one of (a) 0.07 - 0.15 wt. % Zr and (b) 0.15 - 0.50 wt. % Mn.
  • the new 7097 alloy includes all of 0.08 - 0.220 wt. % Cr, 0.07 - 0.15 wt. % Zr and 0.15 - 0.50 wt. % Mn.
  • the teachings of this paragraph also apply to other 7x97 alloys.
  • TYS(L) typically longitudinal (L) tensile yield strength” or TYS(L) is determined in accordance with ASTM B557-10 and by measuring the tensile yield strength (TYS) in the longitudinal direction (L) at the T/4 location from at least three different lots of material, and with at least duplicate specimens being tested for each lot, for a total of at least 6 different measured specimen values, with the typical TYS(L) being the average of the at least 6 different measured specimen values.
  • typical plane strain fracture toughness (K IC ) (L-T)” or L-T K IC is determined in accordance with ASTM E399-12, by measuring the plane strain fracture toughness in the L-T direction at the T/4 location from at least three different lots of material using a C(T) specimen, where“W” is 4.0 inches and“B” is 2.0 inches, with at least duplicate specimens being tested for each lot, for a total of at least 6 different measured specimen values, and with the typical plane strain fracture toughness (K IC ) (L-T) being the average of the at least 6 different valid K IC measured specimen values.
  • “typical L-S crack deviation resistance K max-dev ” is determined by preparing at least triplicate C(T) specimens in accordance with ASTM E647-13e01, entitled “Standard Test Method for Measurement of Fatigue Crack Growth Rates” (“ASTM E647”).
  • the at least triplicate C(T) specimens are taken in the L-S direction from between width/3 and 2width/3 of the material, where the“B” dimension of the specimen is 0.25 inch (6.35 mm) and the“W” dimension of the specimen is 3.0 inches (7.62 cm), and with the notch tip at T/2.
  • the pre-crack must meet all validity requirements of ASTM E647, and the pre-cracking must be performed at the same loading conditions as the test.
  • the test is started using a K max > 10 ksi ⁇ in. (11.1 MPa ⁇ m), and the starting force must be large enough that crack deviation occurs before the ASTM E647 C(T) specimen validity requirement ((W-a) ⁇ (4/ ⁇ ⁇ ⁇ (K max-dev /TYS) 2 ) is no longer met for the test.
  • the typical TYS(L), the typical L-T K IC , and/or the typical L- S K max-dev are generally required to be determined on a rolled 5.00 inch version of the 7xxx aluminum alloy product in the T7451 and the T7651 tempers.
  • a“rolled 5.00 inch version of the 7xxx aluminum alloy product” means a 7xxx aluminum alloy product, having a composition within the scope of the Zn, Mg and Cu limits described herein, that has been conventionally rolled to a nominal thickness of 5.00 inches, within thickness tolerance limits per ANSI H35.2-2001, table 7.7b.
  • All references to specific aluminum alloys e.g., 7085, 7050, 7040
  • “T76 temper” means the T76 temper described in ANSI H35.1-2009, and further requiring SCC resistance (stress corrosion cracking resistance), wherein the SCC resistance is tested in accordance with ASTM G47(2011) using three specimens, wherein all three specimens survive the alternate immersion test for a period of 20 days at a net stress of 25 ksi in the short-transverse (ST) direction.
  • the“T7651” temper means the T76 temper where the plate is stress-relieved 1.5 - 3.0% by stretching prior to artificial aging.
  • “T74 temper” means the T74 temper described in ANSI H35.1-2009, and further requiring SCC resistance (stress corrosion cracking resistance), wherein the SCC resistance is tested in accordance with ASTM G47(2011) using three specimens, wherein all three specimens survive the alternate immersion test for a period of 20 days at a net stress of 35 ksi in the short-transverse (ST) direction.
  • the“T7451” temper means the T74 temper where the plate is stress-relieved 1.5 - 3.0% by stretching prior to artificial aging.
  • FIGS.1-3 are graphs illustrating properties of Example 1 alloys.
  • FIG.4 is a graph illustrating one embodiment of a property boundary requirement for tensile yield strength (L) and crack deviation resistance L-S K max-dev .
  • FIGS. 5-6 are graphs illustrating properties of plant produced 5.3 inch (approx.) gauge plate.
  • FIGS. 7-8 are graphs illustrating properties of plant produced 6.5 inch (approx.) gauge plate.
  • FIGS.9-10 are graphs illustrating properties of the alloys of Example 3.
  • FIGS.11-12 are graphs illustrating properties of the alloys of Example 4.
  • FIG.13 is a photograph showing a C(T) specimen having a crack deviating from the intended crack plane.
  • Alloy 1 is a conventional aluminum alloy, registered with the Aluminum Association as aluminum alloy 7085.
  • the registered version of the 7085 alloy requires, among other things, 0.08 - 0.15 wt. % Zr, not greater than 0.04 wt. % Mn and not greater than 0.04 wt. % Cr, as shown by the document“International Alloy Designations and Chemical Composition Limits for Wrought Aluminum and Wrought Aluminum Alloys”, The Aluminum Association (2009), page 12.
  • Commonly-owned U.S. Patent No. 6,972,110 also relates to the 7085 alloy.
  • Alloys 2-3 are new variants of the 7085 alloy having manganese (Mn) and/or low or no zirconium (Zr).
  • each alloy was aluminum and unavoidable impurities ( ⁇ 0.03 wt. % each, ⁇ 0.10 wt. % total).
  • the ingots were stress-relieved, sawed into multiple sections, scalped, homogenized, and then hot rolled to plate having a final gauge of about 1.75 inches (4.445 cm).
  • the alloy plates were then solution heat treated and then hot water quenched in 190oF water (87.8oC) to simulate cooling conditions at T/2 (mid-thickness) for 5 inch plate relative to cold water (ambient) quenching.
  • the plates were then stretched about 2.25% and then artificially aged in accordance with a standard T7651-type aging practice (see, ANSI H35.1 and AMS 4329A).
  • Tables 2-3 The test results are shown in Tables 2-3, below.
  • Table 2 provides the measured values in standard metric units, and Table 3 provides the measured values in English units.
  • the shown strength and elongation values are averages of duplicate specimens.
  • the fracture toughness values are taken from a single specimen.
  • the crack deviation values are averages of triplicate specimens.
  • Alloy 4 is a conventional 7085-style plate product rolled to a final gauge of 5.4 inches (137.2 mm).
  • Alloy 5 is a conventional 7085-style plate product rolled to a final gauge of 5.2 inches (132.1 mm). Alloy 4 was aged to a T7651-style temper.
  • Alloy 5 was aged to two different aging conditions, (a) a T7451-style temper (see, ANSI H35.1 and AMS 4470A) and (b) an aging condition overaged relative to the T7451-style temper.
  • a T7451-style temper see, ANSI H35.1 and AMS 4470A
  • an aging condition overaged relative to the T7451-style temper After artificial aging, the mechanical properties of Alloys 4-5 were tested as per the testing of the lab-scale materials, except the strength and elongation properties were measured at T/4, the L-S K max-dev C(T) specimen“W” dimension was 3.0 inches, and the tests were started using a K max of approximately 10 ksi ⁇ in.
  • Tables 5-6 below. Table 5 provides the measured values in standard metric units, and Table 6 provides the measured values in English units.
  • FIGS.1-3 are graphs illustrating the properties of the alloys based on the above data.
  • the plant and lab-scale 7085 T7651-style materials have generally similar properties, indicating that the slow quench conditions for the lab-scale materials appropriately model the behavior of the plant produced thick gauge products.
  • the addition of manganese in alloys 2-3 appears to have a limited impact on improving the combination of crack deviation resistance and tensile yield strength.
  • each alloy was aluminum and unavoidable impurities ( ⁇ 0.03 wt. % each, ⁇ 0.10 wt. % total).
  • the plant-scale ingots were scalped, homogenized, and then hot rolled to final gauge.
  • the alloy plates were then solution heat treated and then cold water quenched.
  • the plates were then stretched about 2.25% and then artificially aged in accordance with a T7651-type aging practice (see, ANSI H35.1 and AMS 4329A).
  • Alloy 6 is a conventional 7085-style plate product rolled to a final gauge of 6.5 inches (165.1 mm). Alloys 7-9 are new variants of the 7085 alloy having manganese (Mn), chromium (Cr), and/or low zirconium (Zr). Alloys 7-8 were rolled to a final gauge of 5.4 inches (137.2 mm). Alloy 9 was rolled to a final gauge of 6.5 inches (165.1 mm).
  • K max-dev The typical L-S crack deviation resistance properties (K max-dev ) were determined per the test procedure described above, except the“W” dimension of the specimen was 2.0 inches (5.08 cm). The test is started using a K max of approximately 15 ksi ⁇ in. The test results are shown in Tables 8-9, below. Table 8 provides the measured values in standard metric units, and Table 9 provides the measured values in English units.
  • FIGS. 5-8 are graphs illustrating the properties of the plant based materials. As shown, the new materials having chromium, manganese, and zirconium realize a large improvement in crack deviation resistance relative to the conventional material. The new materials also realize a similar or improved strength-toughness trade-off.
  • FIG. 4 illustrates one embodiment of a property requirement boundary for the new thick wrought 7xxx alloys based on data herein.
  • Alloy 10 is a conventional 7085-style alloy. Alloys 11-26 are new alloys having varying amounts of zinc (Zn), magnesium (Mg), copper (Cu), manganese (Mn), chromium (Cr), and/or zirconium (Zr).
  • the lab-scale ingot were stress-relieved, sawed into multiple sections, scalped, homogenized, and then hot rolled to plate having a final gauge of about 1.75 inches (4.445 cm).
  • the alloy plates were then solution heat treated and then hot water quenched in 180oF water (82.2oC) to simulate cooling conditions at T/2 (mid-thickness) for 3 inch plate relative to cold water (ambient) quenching.
  • the plates were then stretched about 2.25% and then artificially aged in accordance with a standard T7X51-type aging practice, expected to fall between T7651 and T7451.
  • FIGS.9-10 are graphs illustrating properties of the Example 3 alloys. As shown, the materials respond differently to additions of Cr as a function of Zn, Mg and Cu levels. For a 7085-type alloy (alloys 10-13), the presence of Cr, Mn and Zr facilitates a K max-dev improvement over the conventional 7085 material (alloy 10). For alloys with increased Mg content (alloys 14- 17), the addition of Cr in and of itself without the need for Zr facilitates significant increases in K max-dev at equivalent strength levels over an alloy with Zr but no Cr (alloy 14).
  • FIG.10 shows that a similar trade-off between fracture toughness and tensile yield strength is achieved for a 7085-type alloy containing Cr, Mn and Zr (alloy 13) over the conventional 7085 material (alloy 10).
  • alloys with increased Mg, reduced or increased Zn content with additions of Cr realize similar or improved trade-offs between fracture toughness and tensile yield strength over their Cr-free and Zr-containing base alloys.
  • Alloys 31-32 are conventional 7085-style alloy. Alloys 27-30 are new alloys having varying amounts of manganese (Mn), chromium (Cr), and/or zirconium (Zr).
  • the lab-scale ingots were stress-relieved, sawed into multiple sections, scalped, homogenized, and then hot rolled to plate having a final gauge of about 1.75 inches (4.445 cm).
  • the alloy plates were then solution heat treated and then hot water quenched in 190oF water (87.8oC) to simulate cooling conditions at T/2 (mid-thickness) for 5 inch plate relative to cold water (ambient) quenching.
  • the plates were then stretched about 2.25% and then artificially aged in accordance with a standard T7651-type or T7451-type aging practice.
  • FIGS.11-12 are graphs illustrating properties of the Example 4 alloys. As shown, the addition of manganese in alloys 27 & 28 appears to have a limited impact on improving the trade-off between crack deviation resistance and tensile yield strength. Furthermore, the addition of only low levels of Cr (0.12-0.13) in alloys 29 & 30 appears to be insufficient to provide a significant impact on K max-dev relative to conventional 7085 materials (alloys 31 & 32).

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CA2982482C (en) 2023-06-13
RU2017142718A (ru) 2019-06-11
KR20180004736A (ko) 2018-01-12
CA2982482A1 (en) 2016-11-17
EP4074851A1 (de) 2022-10-19
CN107592887A (zh) 2018-01-16
CN107592887B (zh) 2020-12-08
RU2017142718A3 (de) 2019-10-17
EP3294917B1 (de) 2022-03-02
KR102610549B1 (ko) 2023-12-05

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