High strength Al-Zn alloy and method for producing such an alloy product
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United States of America Patent
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Issued Date -
Feb 17, 2005
app pub date -
Apr 7, 2004
filing date -
Apr 10, 2003
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Abandoned
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Abstract
The present invention relates to a high strength Al--Zn alloy product with an improved combination of corrosion resistance and toughness, the alloy including essentially (in weight percent): Zn: 6.0-9.5, Cu: 1.3-2.4, Mg: 1.5-2.6, Mn and Zr<0.25 but preferably in a range between 0.05 and 0.15 for higher Zn contents, other elements each less than 0.05 and less than 0.25 in total, balance aluminium, wherein (in weight percent): 0.1[Cu]+1.3<[Mg]<0.2[Cu]+2.15. The invention also relates to a method to produce these alloy products, and to some preferred applications thereof such as upper wing applications in aerospace.
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