EP3368702B1 - Verbesserte knetlegierungen aus 7xxx-aluminium und verfahren zur herstellung davon - Google Patents

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

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EP3368702B1
EP3368702B1 EP16860785.1A EP16860785A EP3368702B1 EP 3368702 B1 EP3368702 B1 EP 3368702B1 EP 16860785 A EP16860785 A EP 16860785A EP 3368702 B1 EP3368702 B1 EP 3368702B1
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aluminum alloy
7xxx aluminum
wrought 7xxx
another embodiment
new wrought
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French (fr)
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EP3368702C0 (de
EP3368702A1 (de
EP3368702A4 (de
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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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Howmet Aerospace Inc
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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.
  • WO 2015/167916 discloses wrought 7xxx aluminum alloys A2, A3, B3 and B4 comprising Zn, Mg, Cu, Fe, Si, Mn, Ti, V, Zr and B.
  • 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. % (i.e., wt. % Zn + wt. % Mg ⁇ 6.50 wt. %). In another embodiment, 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 Pandat TM software and the PanAluminum thermodynamic database (CompuTherm LLC, 437 S. Yellowstone Dr. Suite 217, Madison, WI, 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.
  • the new wrought 7xxx aluminum alloys generally include from 0.10 to 0.50 wt. % Mn.
  • a new wrought 7xxx aluminum alloy includes from 0.10 to 0.25 wt. % Mn.
  • 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.
  • 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 2.54 mm (1.0 inch), after which two identical pieces of this plate are solution heat treated, after which one piece is cold water quenched in 25°C (77°F) water and the other piece is boiling water quenched, both for a period of 10 minutes, after which the pieces are allowed to air dry.
  • the two pieces are then both naturally aged for 24 hours and then both two-step artificially aged with a first step of 121°C (250°F) for 3 hours (with a 2-hour heat up from ambient to 121°C (250°F)) and a second step of 171°C (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 48 MPa (7 ksi) (i.e., CWQ(TYS) - BWQ(TYS) ⁇ 7 ksi).
  • a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than 41 MPa (6 ksi).
  • a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than 34 MPa (5 ksi).
  • a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than 28 MPa (4 ksi).
  • a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than 21 MPa (3 ksi). In another embodiment, a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than 14 MPa (2 ksi). In yet another embodiment, a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than 7 MPa (1 ksi). In another embodiment, a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than 0 MPa (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 -7 MPa (-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 -14 MPa (-2 ksi).
  • a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than -21 MPa (-3 ksi).
  • a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than -28 MPa (-4 ksi).
  • a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than -34 MPa (-5 ksi). In another embodiment, a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than -41 MPa (-6 ksi). In another embodiment, a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than -48 MPa (-7 ksi). In another embodiment, a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than -55 MPa (-8 ksi). In another embodiment, a new wrought 7xxx aluminum alloy realizes a quench insensitivity of not greater than -62 MPa (-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 66°C (150°F) to boiling (100°C (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.
  • a hot water quench may facilitate improved SCC resistance.
  • a new wrought 7xxx aluminum alloy is air quenched (e.g., via a forced air quench).
  • a new wrought 7xxx aluminum alloy is press-quenched.
  • the quenching step results in an average cooling rate of from -17.2°C to -3.9°C (1°F to 25°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 -5.3°C (22.5°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 -6.7°C (20°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 -8.1°C (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 -9.4°C (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 -10.8°C (12.5°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 -12.2°C (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 -12.8°C (9.0°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 -13.3°C (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 -13.9°C (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 -14.4°C (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 121°C (250°F) for 3 hours and then 171°C (340°F) for 8 hours. Several of the alloy samples in the naturally aged condition were also artificially aged at 121°C (250°F) for 3 hours and then 171°C (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.
  • Three test specimens per alloy were used, and the number of cycles to failure was measured for each specimen.
  • the test run-out was 10,000,000 cycles.
  • alloy 20 with no zirconium realizes worse fatigue properties relative to alloys 1, 13 and 16.
  • the plates were then two-step artificially aged with a first step of 121°C (250°F) for 3 hours (with a 2-hour heat up from ambient to 121°C (250°F)) and a second step of 171°C (340°F) for 8 hours.
  • the longitudinal (L) mechanical properties of the plates were then measured at T/2 and in accordance with ASTM B557 and E8, the results of which are shown in Table 5, below (average of duplicate specimens).
  • Alloy A realizes a superior combination of strength, elongation and SCC resistance properties. As shown, Alloy A is generally quench insensitive, realizing about 55 MPa (8 ksi) higher tensile yield strength when boiling water quenched.

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Claims (15)

  1. Geschmiedetes 7xxx-Aluminiumlegierungsprodukt, bestehend aus:
    (a) von 3,75 bis 8,0 Gew.-% Zn;
    (b) von 1,25 bis 3,0 Gew.-% Mg;
    (c) von 0,35 bis 1,35 Gew.-% Cu;
    (d) von 0,04 bis 0,20 Gew.-% V;
    (e) von 0,06 bis 0,20 Gew.-% Zr;
    wobei V + Zr ≤ 0,23 Gew.-%;
    (f) von 0,01 bis 0,25 Gew.-% Ti;
    (g) bis zu 0,50 Gew.-% Mn;
    (h) bis zu 0,40 Gew.-% Cr;
    (i) bis zu 0,35 Gew.-% Fe; und
    (j) bis zu 0,25 Gew.-% Si;
    (k) wobei der Rest aus Aluminium und Verunreinigungen besteht, wobei die geschmiedete 7xxx-Aluminiumlegierung nicht mehr als 0,10 Gew.-% von einer beliebigen Verunreinigung enthält und wobei die geschmiedete 7xxx-Aluminiumlegierung insgesamt nicht mehr als 0,35 Gew.-% Verunreinigungen enthält,
    mit der Ausnahme, dass das geschmiedete 7xxx-Aluminiumlegierungsprodukt nicht aus Folgendem besteht:
    4,20 Gew.-% Zn, 1,56 Gew.-% Mg, 0,65 Gew.-% Cu, 0,057 Gew.-% V, 0,09 Gew.-% Zr, 0,07 Gew.-% Ti, 0,05 Gew.-% Mn, 0,08 Gew.-% Fe, 0,05 Gew.-% Si und 0,02 Gew.-% B; oder
    4,35 Gew.-% Zn, 1,62 Gew.-% Mg, 0,63 Gew.-% Cu, 0,103 Gew.-% V, 0,09 Gew.-% Zr, 0,06 Gew.-% Ti, 0,05 Gew.-% Mn, 0,08 Gew.-% Fe, 0,05 Gew.-% Si und 0,02 Gew.-% B; oder
    4,38 Gew.-% Zn, 1,62 Gew.-% Mg, 0,48 Gew.-% Cu, 0,10 Gew.-% V, 0,091 Gew.-% Zr, 0,07 Gew.-% Ti, 0,05 Gew.-% Mn, 0,10 Gew.-% Fe, 0,05 Gew.-% Si und 0,02 Gew.-% B; oder
    4,39 Gew.-% Zn, 1,61 Gew.-% Mg, 0,78 Gew.-% Cu, 0,11 Gew.-% V, 0,091 Gew.-% Zr, 0,07 Gew.-% Ti, 0,05 Gew.-% Mn, 0,10 Gew.-% Fe, 0,05 Gew.-% Si und 0,02 Gew.-% B.
  2. Geschmiedetes 7xxx-Aluminiumlegierungsprodukt nach Anspruch 1, wobei die geschmiedete 7xxx-Aluminiumlegierung ein geschmiedetes Radprodukt ist.
  3. Geschmiedetes 7xxx-Aluminiumlegierungsprodukt nach Anspruch 2, wobei die geschmiedete 7xxx-Aluminiumlegierung den Härtegrad T5 aufweist.
  4. Geschmiedetes 7xxx-Aluminiumlegierungsprodukt nach Anspruch 3, wobei die geschmiedete 7xxx-Aluminiumlegierung eine Abschreckunempfindlichkeit von nicht mehr als 48 MPa (7 ksi) erreicht.
  5. Geschmiedetes 7xxx-Aluminiumlegierungsprodukt nach einem der vorhergehenden Ansprüche, wobei die geschmiedete Aluminiumlegierung nicht mehr als 5,5 Gew.-% Zn beinhaltet.
  6. Geschmiedetes 7xxx-Aluminiumlegierungsprodukt nach einem der vorhergehenden Ansprüche, wobei die geschmiedete Aluminiumlegierung nicht mehr als 4,75 Gew.-% Zn beinhaltet.
  7. Geschmiedetes 7xxx-Aluminiumlegierungsprodukt nach einem der vorhergehenden Ansprüche, wobei die kombinierte Menge an Zink und Magnesium nicht größer als 7,0 Gew.-% ist.
  8. Geschmiedetes 7xxx-Aluminiumlegierungsprodukt nach einem der vorhergehenden Ansprüche, wobei die kombinierte Menge an Zink und Magnesium nicht größer als 6,0 Gew.-% ist.
  9. Geschmiedetes 7xxx-Aluminiumlegierungsprodukt nach einem der vorhergehenden Ansprüche, wobei die geschmiedete 7xxx-Aluminiumlegierung nicht mehr als 0,95 Gew.-% Cu beinhaltet.
  10. Geschmiedetes 7xxx-Aluminiumlegierungsprodukt nach einem der vorhergehenden Ansprüche, wobei die geschmiedete 7xxx-Aluminiumlegierung mindestens 0,50 Gew.-% Cu beinhaltet.
  11. Geschmiedetes 7xxx-Aluminiumlegierungsprodukt nach einem der vorhergehenden Ansprüche, wobei die geschmiedete 7xxx-Aluminiumlegierung 0,06-0,16 Gew.-% V und 0,07-0,16 Gew.-% Zr beinhaltet.
  12. Geschmiedetes 7xxx-Aluminiumlegierungsprodukt nach einem der vorhergehenden Ansprüche, wobei der Gesamtvolumenanteil der enthaltenen Partikel aus Al3Zr, Al23V4, Al7V und Al10V 0,07 Vol.-% nicht übersteigt; oder 0,01 Vol.-% nicht übersteigt.
  13. Geschmiedetes 7xxx-Aluminiumlegierungsprodukt nach einem der vorhergehenden Ansprüche, wobei die geschmiedete 7xxx-Aluminiumlegierung nicht mehr als 0,05 Gew.-% von einer beliebigen Verunreinigung enthält und wobei die geschmiedete 7xxx-Aluminiumlegierung insgesamt nicht mehr als 0,15 Gew.-% Verunreinigungen enthält.
  14. Geschmiedetes 7xxx-Aluminiumlegierungsprodukt nach einem der vorhergehenden Ansprüche, wobei die geschmiedete 7xxx-Aluminiumlegierung ein geschmiedetes Radprodukt mit dem Härtegrad T5 ist und wobei die geschmiedete 7xxx-Aluminiumlegierung eine Abschreckunempfindlichkeit von nicht mehr als 0 MPa (0 ksi) erreicht.
  15. Geschmiedetes 7xxx-Aluminiumlegierungsprodukt nach einem der vorhergehenden Ansprüche, wobei die geschmiedete 7xxx-Aluminiumlegierung 0,02-0,05 Gew.-% Ti umfasst.
EP16860785.1A 2015-10-29 2016-10-27 Verbesserte knetlegierungen aus 7xxx-aluminium und verfahren zur herstellung davon Active EP3368702B1 (de)

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US201562248165P 2015-10-29 2015-10-29
PCT/US2016/059120 WO2017075217A1 (en) 2015-10-29 2016-10-27 Improved wrought 7xxx aluminum alloys, and methods for making the same

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WO2019089736A1 (en) 2017-10-31 2019-05-09 Arconic Inc. Improved aluminum alloys, and methods for producing the same
EP3833794B1 (de) * 2018-11-12 2023-01-04 Novelis Koblenz GmbH Produkt aus einer 7xxx serien aluminiumlegierung
WO2020172046A1 (en) * 2019-02-20 2020-08-27 Howmet Aerospace Inc. Improved aluminum-magnesium-zinc aluminum alloys
US20210172044A1 (en) * 2019-12-05 2021-06-10 Kaiser Aluminum Fabricated Products, Llc High Strength Press Quenchable 7xxx alloy

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HUE063975T2 (hu) 2024-02-28
EP3368702C0 (de) 2023-08-16
US20170121795A1 (en) 2017-05-04
WO2017075217A1 (en) 2017-05-04
EP3368702A1 (de) 2018-09-05
CN108291280B (zh) 2021-05-11
CA3003158A1 (en) 2017-05-04
EP3368702A4 (de) 2019-07-17
CN108291280A (zh) 2018-07-17

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