Al-Cu-Mg-Si ALLOY AND METHOD FOR PRODUCING THE SAME

摘要

The present invention concerns a balanced AI-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 AI-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.