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Aluminum alloy products suited for commercial jet aircraft wing members

  • US 5,865,911 A
  • Filed: 05/26/1995
  • Issued: 02/02/1999
  • Est. Priority Date: 05/26/1995
  • Status: Expired due to Term
First Claim
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1. A method of producing a lower wing skin structural member for a commercial jet aircraft comprising providing a body of alloy consisting essentially of about 5.9 to 6.7% zinc, about 1.6 to 1.86% magnesium, about 1.8 to 2.4% copper, about 0.08 to about 0.15% zirconium, not more than about 0.06% silicon, not more than about 0.06% irons, not more than about 0.11% iron plus silicon, the balance aluminum, incidental elements and impurities;

  • homogenizing said alloy by heating within about 750°

    to about 890°

    F. and then further homogenizing by further heating up and further increasing alloy temperature to between about 890° and

    about 910°

    F. to provide a homogenized alloy,hot rolling said homogenized alloy at temperatures above 750°

    F. to provide hot rolled alloy,solution heat treating said hot rolled alloy at a temperature of at least 880°

    F. to provide a solution beat treated alloy,quenching said solution heat treated alloy to provide a quenched alloy,stretching said quenched alloy at least about 1% to provide a stretched alloy,artificially aging said stretched alloy by heating within about 175°

    to about 290°

    F. and heating within about 300°

    to 350°

    F.

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