| 摘要 |
The present invention concerns a balanced Al-Cu-Mg-Si alloy having a high toughness, good strength levels and an improved fatigue crack growth resistance, comprising essentially the following composition (in weight percent) : Cu: 3.6-4.9, Mg: 1.0-1.8, Mn:<=0.50, preferably <0.30, Si: 0.10-0.40, Zr:<=0.15, Cr:<=0.15, Fe:<=0.10, the balance essentially aluminum and incidental elements and impurities. There is also disclosed a method for producing the balanced Al-Cu-Mg-Si alloy product having a high toughness and an improved fatigue crack growth resistance, and applications of that product as a structural member of an aircraft.
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