Patent ID: 7323068

Claim:
A high damage tolerant Al—Cu 2xxx-series alloy rolled product having a high toughness and an improved fatigue crack growth resistance, comprising the following composition (in weight percent): Cu: 4.1-4.4 Mg: 1.0-1.6 Zr: 0.06-0.18 Mn: 0.2-0.45 Cr <0.15 Fe: ≦0.15 Si: ≦0.15, the balance essentially aluminum and incidental elements and impurities, wherein the alloy product comprises Mn-containing dispersoids and Zr-containing dispersoids, and wherein the alloy product is in a T351 temper and has a microstructure wherein the grains have an average length to width aspect ratio of smaller than about 3 to 1.