Patent ID: 9410229
Filing Date: 2016-08-09
CPC Classification: C22C

Claim Text:
1. An aluminum alloy product having high strength with good toughness, containing by weight, 8.5-10.5% Zn, 1.4-1.85% Mg, 2.25-3.0% Cu, and at least one element from the group Zr, V, or Hf not exceeding about 0.5%, wherein said alloy includes Mg and Cu at a Mg/Cu ratio of less than 1.0, the balance substantially aluminum and incidental impurities with fracture toughness (as measured in unit propagation energy) exceeding the following relationship: where UPE=fracture toughness as measured in unit propagation energy (#/in 2 ) YS=yield strength (KSI).