Vanadium-free, lithium-free aluminum alloy suitable for forged aerospace products
First Claim
1. A forged structural member having improved combinations of strength and toughness, said structural member made from a substantially vanadium-free, lithium-free aluminum-based alloy consisting essentially of:
- about 4.85-5.3 wt. % copper, about 0.5-1.0 wt. % magnesium, about 0.4-0.8 wt. % manganese, about 0.2-0.8 wt. % silver, up to about 0.25 wt. % zirconium, up to about 0.1 wt. % silicon, and up to about 0.1 wt. % iron, the balance aluminum, incidental elements and impurities, said alloy having a Cu;
Mg ratio between about 5 and 9, and said structural member having a typical longitudinal tensile yield strength of about 71 ksi or higher at room temperature.
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Abstract
There is claimed a forged structural member suitable for aerospace applications and having improved combinations of strength and toughness. The member is made from a substantially vanadium-free, lithium-free aluminum-based alloy consisting essentially of: about 4.85-5.3 wt. % copper, about 0.5-1.0 wt. % magnesium, about 0.4-0.8 wt. % manganese, about 0.2-0.8 wt. % silver, about 0.05-0.25 wt. % zirconium, up to about 0.1 wt. % silicon, and up to about 0.1 wt. % iron, the balance aluminum, incidental elements and impurities, the Cu:Mg ratio of said alloy being between about 5 and 9, and more preferably between about 6.0 and 7.5. The invention exhibits a typical longitudinal tensile yield strength of about 71 ksi or higher at room temperature and can be forged into aircraft wheels or various brake and other product forms.
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Citations
20 Claims
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1. A forged structural member having improved combinations of strength and toughness, said structural member made from a substantially vanadium-free, lithium-free aluminum-based alloy consisting essentially of:
- about 4.85-5.3 wt. % copper, about 0.5-1.0 wt. % magnesium, about 0.4-0.8 wt. % manganese, about 0.2-0.8 wt. % silver, up to about 0.25 wt. % zirconium, up to about 0.1 wt. % silicon, and up to about 0.1 wt. % iron, the balance aluminum, incidental elements and impurities, said alloy having a Cu;
Mg ratio between about 5 and 9, and said structural member having a typical longitudinal tensile yield strength of about 71 ksi or higher at room temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- about 4.85-5.3 wt. % copper, about 0.5-1.0 wt. % magnesium, about 0.4-0.8 wt. % manganese, about 0.2-0.8 wt. % silver, up to about 0.25 wt. % zirconium, up to about 0.1 wt. % silicon, and up to about 0.1 wt. % iron, the balance aluminum, incidental elements and impurities, said alloy having a Cu;
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8. An age formable, forged structural member suitable for aerospace applications and having improved combinations of strength and toughness, said structural member being made from a substantially vanadium-free and lithium-free, aluminum-based alloy consisting essentially of:
- about 4.85-5.3 wt. % copper, about 0.5-1.0 wt. % magnesium, about 0.4-0.8 wt. % manganese, about 0.2-0.8 wt. % silver, about 0.05-0.25 wt. % zirconium, up to about 0.1 wt. % silicon, and up to about 0.1 wt. % iron, the balance aluminum, incidental elements and impurities, said alloy having a Cu;
Mg ratio between about 5 and 9, and said structural member having a typical longitudinal tensile yield strength of about 71 ksi or higher at room temperature. - View Dependent Claims (9, 10, 11, 12, 13)
- about 4.85-5.3 wt. % copper, about 0.5-1.0 wt. % magnesium, about 0.4-0.8 wt. % manganese, about 0.2-0.8 wt. % silver, about 0.05-0.25 wt. % zirconium, up to about 0.1 wt. % silicon, and up to about 0.1 wt. % iron, the balance aluminum, incidental elements and impurities, said alloy having a Cu;
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14. A forged aerospace structural member having improved combinations of strength and toughness, said structural member being made from a substantially vanadium-free, lithium-free aluminum-based alloy consisting essentially of:
- about 4.85-5.3 wt. % copper, about 0.5-1.0 wt. % magnesium, about 0.4-0.8 wt. % manganese, about 0.2-0.8 wt. % silver, up to about 0.25 wt. % zirconium, up to about 0.1 wt. % silicon, and up to about 0.1 wt. % iron, the balance aluminum, incidental elements and impurities, said alloy having a Cu;
Mg ratio between about 5 and 9, and said structural member having a typical longitudinal tensile yield strength of about 71 ksi or higher at room temperature. - View Dependent Claims (15, 16, 17, 18, 19, 20)
- about 4.85-5.3 wt. % copper, about 0.5-1.0 wt. % magnesium, about 0.4-0.8 wt. % manganese, about 0.2-0.8 wt. % silver, up to about 0.25 wt. % zirconium, up to about 0.1 wt. % silicon, and up to about 0.1 wt. % iron, the balance aluminum, incidental elements and impurities, said alloy having a Cu;
Specification
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- Resources
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Current AssigneeAlcoa Incorporated (Howmet Aerospace, Inc.)
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Original AssigneeAluminum Company of America (Howmet Aerospace, Inc.)
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InventorsKarabin, Lynette M.
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Primary Examiner(s)WYSZOMIERSKI, GEORGE P
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Application NumberUS08/831,258Time in Patent Office700 DaysField of Search148/417, 148/439, 420/532, 420/533, 420/534, 420/535, 420/539US Class Current148/417CPC Class CodesC22C 21/16 with magnesiumC22F 1/057 of alloys with copper as th...
