US20170121795A1 - Wrought 7xxx aluminum alloys, and methods for making the same - Google Patents

Wrought 7xxx aluminum alloys, and methods for making the same Download PDF

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US20170121795A1
US20170121795A1 US15/336,443 US201615336443A US2017121795A1 US 20170121795 A1 US20170121795 A1 US 20170121795A1 US 201615336443 A US201615336443 A US 201615336443A US 2017121795 A1 US2017121795 A1 US 2017121795A1
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7xxx aluminum
aluminum alloy
wrought 7xxx
another embodiment
new wrought
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Xinyan Yan
James Daniel Bryant
Jen C. Lin
Wenping Zhang
Eider Simielli
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Howmet Aerospace Inc
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Arconic Inc
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Priority claimed from US14/694,109 external-priority patent/US11103919B2/en
Application filed by Arconic Inc filed Critical Arconic Inc
Priority to US15/336,443 priority Critical patent/US20170121795A1/en
Assigned to ARCONIC INC. reassignment ARCONIC INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: ALCOA INC.
Assigned to ARCONIC INC. reassignment ARCONIC INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BRYANT, JAMES DANIEL, LIN, JEN C., YAN, XINYAN, ZHANG, WENPING
Assigned to ALCOA INC. reassignment ALCOA INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SIMIELLI, Eider
Publication of US20170121795A1 publication Critical patent/US20170121795A1/en
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    • 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
    • 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

Definitions

  • Aluminum alloys are useful in a variety of applications. However, improving one property of an aluminum alloy without degrading another property is elusive. For example, it is difficult to increase the strength or corrosion resistance of a wrought 7xxx aluminum alloy without affecting other properties.
  • the present patent application relates to improved wrought 7xxx aluminum alloys, and methods for producing the same.
  • the new wrought 7xxx aluminum alloys may realize, for instance, an improved combination of at least two of strength, corrosion resistance, fatigue failure resistance, and quench insensitivity, among other properties.
  • the new wrought 7xxx aluminum alloys generally comprise (and in some instance consist essentially of, or consist of), zinc (Zn), magnesium (Mg), copper (Cu), vanadium (V), zirconium (Zr), and titanium (Ti), as primary alloying elements, optionally with manganese (Mn) and/or chromium (Cr), the balance being aluminum (Al), iron (Fe), silicon (Si), and unavoidable impurities, as defined below.
  • Some embodiments of new wrought 7xxx aluminum alloy compositions are shown in FIG. 1 .
  • the new wrought 7xxx aluminum alloys generally include from 3.75 to 8.0 wt. % Zn.
  • a new wrought 7xxx aluminum alloy includes not greater than 7.5 wt. % Zn.
  • a new wrought 7xxx aluminum alloy includes not greater than 7.0 wt. % Zn.
  • a new wrought 7xxx aluminum alloy includes not greater than 6.5 wt. % Zn.
  • a new wrought 7xxx aluminum alloy includes not greater than 6.0 wt. % Zn.
  • a new wrought 7xxx aluminum alloy includes not greater than 5.5 wt. % Zn.
  • a new wrought 7xxx aluminum alloy includes not greater than 5.0 wt. % Zn. In another embodiment, a new wrought 7xxx aluminum alloy includes not greater than 4.75 wt. % Zn. In one embodiment, a new wrought 7xxx aluminum alloy includes at least 4.0 wt. % Zn. In another embodiment, a new wrought 7xxx aluminum alloy includes at least 4.25 wt. % Zn. In yet another embodiment, a new wrought 7xxx aluminum alloy includes at least 4.35 wt. % Zn.
  • the new wrought 7xxx aluminum alloys generally include magnesium in the range of from 1.25 to 3.0 wt. % Mg. In one embodiment, a new wrought 7xxx aluminum alloy includes not greater than 2.75 wt. % Mg. In another embodiment, a new wrought 7xxx aluminum alloy includes not greater than 2.5 wt. % Mg. In yet another embodiment, a new wrought 7xxx aluminum alloy includes not greater than 2.25 wt. % Mg. In another embodiment, a new wrought 7xxx aluminum alloy includes not greater than 2.0 wt. % Mg. In yet another embodiment, a new wrought 7xxx aluminum alloy includes not greater than 1.8 wt. % Mg.
  • a new wrought 7xxx aluminum alloy includes at least 1.35 wt. % Mg. In another embodiment, a new wrought 7xxx aluminum alloy includes at least 1.40 wt. % Mg. In yet another embodiment, a new wrought 7xxx aluminum alloy includes at least 1.45 wt. % Mg. In another embodiment, a new wrought 7xxx aluminum alloy includes at least 1.50 wt. % Mg.
  • the amount of zinc and magnesium may be limited (e.g., to improve corrosion resistance).
  • the combined amount of zinc and magnesium in a new wrought 7xxx aluminum alloy may be not greater than 7.0 wt. % (i.e., wt. % Zn+wt. % Mg ⁇ 7.0 wt. %).
  • the combined amount of zinc and magnesium in a new wrought 7xxx aluminum alloy is not greater than 6.75 wt. % (i.e., wt. % Zn+wt. % Mg ⁇ 6.75 wt. %).
  • the combined amount of zinc and magnesium in a new wrought 7xxx aluminum alloy is not greater than 6.50 wt.
  • the combined amount of zinc and magnesium in a new wrought 7xxx aluminum alloy is not greater than 6.25 wt. % (i.e., wt. % Zn+wt. % Mg ⁇ 6.25 wt. %). In yet another embodiment, the combined amount of zinc and magnesium in a new wrought 7xxx aluminum alloy is not greater than 6.00 wt. % (i.e., wt. % Zn+wt. % Mg ⁇ 6.00 wt. %).
  • the new wrought 7xxx aluminum alloys generally include copper and in the range of from 0.35 to 1.35 wt. % Cu, and where the amount of magnesium exceeds the amount of copper. As shown below, copper may facilitate, for example, improved corrosion resistance (e.g., improved SCC resistance) and/or strength.
  • a new wrought 7xxx aluminum alloy includes not greater than 1.15 wt. % Cu.
  • a new wrought 7xxx aluminum alloy includes not greater than 1.00 wt. % Cu.
  • a new wrought 7xxx aluminum alloy includes not greater than 0.95 wt. % Cu.
  • a new wrought 7xxx aluminum alloy includes not greater than 0.90 wt. % Cu.
  • a new wrought 7xxx aluminum alloy includes not greater than 0.85 wt. % Cu. In another embodiment, a new wrought 7xxx aluminum alloy includes not greater than 0.80 wt. % Cu. In one embodiment, a new wrought 7xxx aluminum alloy includes at least 0.40 wt. % Cu. In another embodiment, a new wrought 7xxx aluminum alloy includes at least 0.45 wt. % Cu. In yet another embodiment, a new wrought 7xxx aluminum alloy includes at least 0.50 wt. % Cu. In another embodiment, a new wrought 7xxx aluminum alloy includes at least 0.55 wt. % Cu. In yet another embodiment, a new wrought 7xxx aluminum alloy includes at least 0.60 wt. % Cu.
  • the new wrought 7xxx aluminum alloys generally include from 0.04 to 0.20 wt. % V. As shown below, vanadium may facilitate, for example, improved corrosion resistance and/or quench insensitivity.
  • a new wrought 7xxx aluminum alloy includes not greater than 0.18 wt. % V.
  • a new wrought 7xxx aluminum alloy includes not greater than 0.16 wt. % V.
  • a new wrought 7xxx aluminum alloy includes not greater than 0.15 wt. % V.
  • a new wrought 7xxx aluminum alloy includes not greater than 0.14 wt. % V.
  • a new wrought 7xxx aluminum alloy includes not greater than 0.13 wt. % V.
  • a new wrought 7xxx aluminum alloy includes not greater than 0.12 wt. % V. In yet another embodiment, a new wrought 7xxx aluminum alloy includes not greater than 0.11 wt. % V. In one embodiment, a new wrought 7xxx aluminum alloy includes at least 0.05 wt. % V. In another embodiment, a new wrought 7xxx aluminum alloy includes at least 0.06 wt. % V. In yet another embodiment, a new wrought 7xxx aluminum alloy includes at least 0.07 wt. % V. In another embodiment, a new wrought 7xxx aluminum alloy includes at least 0.08 wt. % V.
  • the new wrought 7xxx aluminum alloys generally include from 0.06 to 0.20 wt. % Zr. As shown by the below data, the combination of vanadium and zirconium may facilitate, for instance, improved fatigue failure resistance properties.
  • a new wrought 7xxx aluminum alloy includes not greater than 0.18 wt. % Zr.
  • a new wrought 7xxx aluminum alloy includes not greater than 0.16 wt. % Zr.
  • a new wrought 7xxx aluminum alloy includes not greater than 0.15 wt. % Zr.
  • a new wrought 7xxx aluminum alloy includes not greater than 0.14 wt. % Zr.
  • a new wrought 7xxx aluminum alloy includes not greater than 0.13 wt. % Zr. In one embodiment, a new wrought 7xxx aluminum alloy includes at least 0.07 wt. % Zr. In another embodiment, a new wrought 7xxx aluminum alloy includes at least 0.08 wt. % Zr.
  • the total amount of vanadium plus zirconium should be controlled to restrict formation of a high volume fraction of constituent particles (e.g., a high volume fraction of Al 3 Zr, Al 23 V 4 , Al 7 V and/or Al 10 V constituent particles).
  • the total amount of vanadium plus zirconium does not exceed 0.23 wt. % V+Zr.
  • the total amount of vanadium plus zirconium does not exceed 0.22 wt. % V+Zr.
  • the total amount of vanadium plus zirconium does not exceed 0.21 wt. % V+Zr.
  • the total amount of vanadium plus zirconium does not exceed 0.20 wt. % V+Zr.
  • the total volume fraction of Al 3 Zr, Al 23 V 4 , Al 7 V and Al 10 V constituent particles does not exceed 0.07%.
  • the total volume fraction of these constituent particles may be determined, for instance, by PandatTM software and the PanAluminum thermodynamic database (CompuTherm LLC, 437 S. Yellowstone Dr. Suite 217, Madison, Wis., USA).
  • the total volume fraction of Al 3 Zr, Al 23 V 4 , Al 7 V and Al 10 V constituent particles does not exceed 0.06%.
  • the total volume fraction of Al 3 Zr, Al 23 V 4 , Al 7 V and Al 10 V constituent particles does not exceed 0.05%.
  • the total volume fraction of Al 3 Zr, Al 23 V 4 , Al 7 V and Al 10 V constituent particles does not exceed 0.04%. In another embodiment, the total volume fraction of Al 3 Zr, Al 23 V 4 , Al 7 V and Al 10 V constituent particles does not exceed 0.03%. In yet another embodiment, the total volume fraction of Al 3 Zr, Al 23 V 4 , Al 7 V and Al 10 V constituent particles does not exceed 0.02%. In another embodiment, the total volume fraction of Al 3 Zr, Al 23 V 4 , Al 7 V and Al 10 V constituent particles does not exceed 0.01%. In yet another embodiment, the total volume fraction of Al 3 Zr, Al 23 V 4 , Al 7 V and Al 10 V constituent particles does not exceed 0.005%.
  • the new wrought 7xxx aluminum alloys generally include from 0.01 to 0.25 wt. % Ti. In one embodiment, a new wrought 7xxx aluminum alloy includes from 0.01 to 0.15 wt. % Ti. In another embodiment, a new wrought 7xxx aluminum alloy includes from 0.01 to 0.10 wt. % Ti. In yet another embodiment, a new wrought 7xxx aluminum alloy includes from 0.01 to 0.08 wt. % Ti. In another embodiment, a new wrought 7xxx aluminum alloy includes from 0.02 to 0.05 wt. % Ti. The titanium may be present (e.g., at least partially present) in the form of TiB 2 or TiC.
  • the new wrought 7xxx aluminum alloys may include up to 0.50 wt. % Mn. In embodiments where manganese is utilized, the new wrought 7xxx aluminum alloys generally include from 0.10 to 0.50 wt. % Mn. In one embodiment, a new wrought 7xxx aluminum alloy includes from 0.10 to 0.25 wt. % Mn. In some embodiments, the new wrought 7xxx aluminum alloys are substantially free of manganese, and, in these embodiments, contain less than 0.10 wt. %. Mn (i.e., ⁇ 0.09 wt. % Mn), such as ⁇ 0.05 wt. % Mn, or ⁇ 0.04 wt. % Mn, or ⁇ 0.03 wt. % Mn.
  • Mn i.e., ⁇ 0.09 wt. % Mn
  • the new wrought 7xxx aluminum alloys may include up to 0.40 wt. % Cr.
  • the new wrought 7xxx aluminum alloys generally include from 0.10 to 0.40 wt. % Cr.
  • a new wrought 7xxx aluminum alloy includes from 0.10 to 0.35 wt. % Cr.
  • a new wrought 7xxx aluminum alloy includes from 0.10 to 0.25 wt. % Cr.
  • the new wrought 7xxx aluminum alloys are substantially free of chromium, and, in these embodiments, contain less than 0.10 wt. %. Cr (i.e., ⁇ 0.09 wt. % Cr), such as ⁇ 0.05 wt. % Cr, or ⁇ 0.04 wt. % Cr, or ⁇ 0.03 wt. % Cr.
  • the new wrought 7xxx aluminum alloys may include iron, up to 0.35 wt. % Fe.
  • a new wrought 7xxx aluminum alloy includes not greater than 0.25 wt. % Fe.
  • a new wrought 7xxx aluminum alloy includes not greater than 0.20 wt. % Fe.
  • a new wrought 7xxx aluminum alloy includes not greater than 0.15 wt. % Fe.
  • a new wrought 7xxx aluminum alloy includes not greater than 0.12 wt. % Fe.
  • a new wrought 7xxx aluminum alloy includes not greater than 0.10 wt. % Fe.
  • a new wrought 7xxx aluminum alloy includes not greater than 0.08 wt. % Fe.
  • a new wrought 7xxx aluminum alloy includes at least 0.01 wt. % Fe.
  • the new wrought 7xxx aluminum alloys may include silicon, up to 0.25 wt. % Si.
  • a new wrought 7xxx aluminum alloy includes not greater than 0.20 wt. % Si.
  • a new wrought 7xxx aluminum alloy includes not greater than 0.15 wt. % Si.
  • a new wrought 7xxx aluminum alloy includes not greater than 0.10 wt. % Si.
  • a new wrought 7xxx aluminum alloy includes not greater than 0.08 wt. % Si.
  • a new wrought 7xxx aluminum alloy includes not greater than 0.05 wt. % Si.
  • a new wrought 7xxx aluminum alloy includes at least 0.01 wt. % Si.
  • the balance of the new wrought 7xxx aluminum alloy is generally aluminum and unavoidable impurities.
  • the new wrought 7xxx aluminum alloys contain not more than 0.10 wt. % each of any one impurity (measured on an elemental basis), with the total combined amount of these impurities not exceeding 0.35 wt. % in the new wrought 7xxx aluminum alloy (i.e., ⁇ 0.10 wt. % each of any one impurity, and with the total impurities being ⁇ 0.35 wt. %).
  • each one of the impurities, individually, does not exceed 0.05 wt.
  • each one of these impurities individually, does not exceed 0.03 wt. % in the new wrought 7xxx aluminum alloy, and the total combined amount of these impurities does not exceed 0.10 wt. % in the new wrought 7xxx aluminum alloys (i.e., ⁇ 0.03 wt. % each of any one impurity, and with the total impurities being ⁇ 0.10 wt. %).
  • the new wrought 7xxx aluminum alloys described herein may be cast (e.g., as ingot or billet), then homogenized, and then hot worked to an intermediate or final form (e.g., cold working after the hot working when the hot working produces an intermediate form).
  • the hot working is forging.
  • the forging produces a shaped product, such as a wheel product.
  • the hot working is rolling or extruding.
  • the new alloy may be tempered, such as by solution heat treating, and then quenching, and then natural aging, followed by artificial aging. Suitable tempers include the T4, T5, T6, and T7 tempers, for instance, as defined in ANSI H35.1 (2009).
  • the new alloy compositions described herein are processed into a forged wheel product per the processes described in commonly-owned U.S. Patent Application Publication No. 2006/0000094, which is incorporated herein by reference in its entirety.
  • the new wrought 7xxx aluminum alloys described herein are processed to a T5 temper (e.g., a T53 temper), which may include press quenching the new wrought 7xxx aluminum alloys (e.g., in the form of a forged wheel) after solution heat treatment.
  • the new wrought 7xxx aluminum alloys may realize improved quench insensitivity.
  • Quench insensitivity relates to an aluminum alloy's sensitivity to the quench conditions used after solution heat treatment.
  • One indicator of quench sensitivity is a significant drop in strength with low quench rates as compared to high quench rates.
  • the new wrought 7xxx aluminum alloys described herein may be relatively quench insensitive.
  • quench insensitivity is measured by conventionally producing a new wrought 7xxx aluminum alloy as a rolled plate having a final gauge of 1.0 inch (2.54 mm), after which two identical pieces of this plate are solution heat treated, after which one piece is cold water quenched in 77° F.
  • the two pieces are then both naturally aged for 24 hours and then both two-step artificially aged with a first step of 250° F. for 3 hours (with a 2-hour heat up from ambient to 250° F.) and a second step of 340° F. for 8 hours.
  • the longitudinal (L) tensile yield strengths of these two pieces are then measured at T/2 in accordance with ASTM B557 and E8, using at least duplicate specimens, after which the measured strengths are averaged for each piece.
  • the average TYS(L) of the cold water quenched (“CWQ”) piece is then compared to the average TYS(L) of the boiling water quenched (BWQ′′) TYS.
  • the difference between the two average TYS values i.e., CWQ(TYS) ⁇ BWQ(TYS) is the quench insensitivity of the alloy.
  • a new wrought 7xxx aluminum alloy realizes a quench insensitivity (as defined above) of not greater than 7 ksi (i.e., CWQ(TYS) ⁇ BWQ(TYS) ⁇ 7 ksi).
  • a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than 6 ksi.
  • a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than 5 ksi.
  • a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than 4 ksi.
  • a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than 3 ksi. In another embodiment, a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than 2 ksi. In yet another embodiment, a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than 1 ksi. In another embodiment, a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than 0 ksi, meaning the boiling water quenched alloy realizes at least equivalent strength to the cold water quenched alloy.
  • a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than ⁇ 1 ksi, meaning the boiling water quenched alloy realizes higher strength than the cold water quenched alloy.
  • a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than ⁇ 2 ksi.
  • a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than ⁇ 3 ksi.
  • a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than ⁇ 4 ksi.
  • a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than ⁇ 5 ksi.
  • a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than ⁇ 6 ksi. In another embodiment, a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than ⁇ 7 ksi. In another embodiment, a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than ⁇ 8 ksi. In another embodiment, a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than ⁇ 9 ksi, or more.
  • the quench insensitivity of the new wrought 7xxx aluminum alloys may facilitate improved strength. Likewise, when using a hot quench media, a new wrought 7xxx aluminum alloy may realize less distortion.
  • the new wrought 7xxx aluminum alloys may be post-solution heat treatment quenched with any applicable fluid or media.
  • a new wrought 7xxx aluminum alloy is water quenched (cold water quenched, hot water quenched, or boiling water quenched).
  • the new wrought 7xxx aluminum alloy is hot or boiling water quenched.
  • a hot water quench is a quenching using water having a temperature of from 150° F. to boiling (212° F. at standard temperature and pressure).
  • a boiling water quench uses boiling water.
  • a boiling water quench is a species of the hot water quench genus. As shown by the below data, use of a hot water quench (including a boiling water quench) may facilitate improved SCC resistance.
  • a new wrought 7xxx aluminum alloy is air quenched (e.g., via a forced air quench). In yet another embodiment, a new wrought 7xxx aluminum alloy is press-quenched.
  • the quenching step results in an average cooling rate of from 1° F. to 25° F. per second as measured during the first 60 seconds of the quench. In another embodiment, the quenching step results in an average cooling rate of not greater than 22.5° F. per second as measured during the first 60 seconds of the quench. In yet another embodiment, the quenching step results in an average cooling rate of not greater than 20° F. per second as measured during the first 60 seconds of the quench.
  • the quenching step results in an average cooling rate of not greater than 17.5° F. per second as measured during the first 60 seconds of the quench. In yet another embodiment, the quenching step results in an average cooling rate of not greater than 15° F. per second as measured during the first 60 seconds of the quench. In another embodiment, the quenching step results in an average cooling rate of not greater than 12.5° F. per second as measured during the first 60 seconds of the quench. In yet another embodiment, the quenching step results in an average cooling rate of not greater than 10° F. per second as measured during the first 60 seconds of the quench. In another embodiment, the quenching step results in an average cooling rate of not greater than 9.0° F. per second as measured during the first 60 seconds of the quench.
  • the quenching step results in an average cooling rate of not greater than 8.0° F. per second as measured during the first 60 seconds of the quench. In another embodiment, the quenching step results in an average cooling rate of not greater than 7.0° F. per second as measured during the first 60 seconds of the quench. In yet another embodiment, the quenching step results in an average cooling rate of not greater than 6.0° F. per second as measured during the first 60 seconds of the quench.
  • FIG. 1 is a table illustrating various embodiments of new 7xxx wrought aluminum alloy compositions.
  • the hot rolled plates were then solution heat treated, cold water quenched, and then allowed to naturally age for about 24-hours. After natural aging, the plates were then two-step artificially aged at 250° F. for 3 hours and then 340° F. for 8 hours. Several of the alloy samples in the naturally aged condition were also artificially aged at 250° F. for 3 hours and then 340° F. for 16 hours.
  • the longitudinal (L) mechanical properties of the artificially aged plates were then measured at T/2 and in accordance with ASTM B557 and E8, the results of which are shown in Table 2, below (average of duplicate specimens).
  • alloys 5-6 and 9-10 with low zinc (alloys 5-6) or low magnesium (9-10) have low strength, not achieving a tensile yield strength (TYS) of at least 320 MPa in combination with an elongation of at least 12%.
  • TLS tensile yield strength
  • Rotating beam fatigue testing in accordance with ISO 1143 was also conducted on alloy plates 1, 13, 16 and 20, the results of which are shown in Table 3, below.
  • alloy 20 with no zirconium realizes worse fatigue properties relative to alloys 1, 13 and 16.
  • Alloy A realizes a superior combination of strength, elongation and SCC resistance properties. As shown, Alloy A is generally quench insensitive, realizing about 8 ksi higher tensile yield strength when boiling water quenched.

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US14/694,109 US11103919B2 (en) 2014-04-30 2015-04-23 7xx aluminum casting alloys, and methods for making the same
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EP3368702C0 (de) 2023-08-16
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EP3368702A1 (de) 2018-09-05
CN108291280B (zh) 2021-05-11
CA3003158A1 (en) 2017-05-04
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EP3368702B1 (de) 2023-08-16
CN108291280A (zh) 2018-07-17

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