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Vanadium-free, lithium-free aluminum alloy suitable for forged aerospace products

  • US 5,879,475 A
  • Filed: 04/08/1997
  • Issued: 03/09/1999
  • Est. Priority Date: 03/22/1995
  • Status: Expired due to Term
First Claim
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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.

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