Abstract: The invention relates to high strength aluminium—based alloy of Al—Zn—Mg—Cu system and the articles made thereof. The present alloy is characterized by the combination of improved properties: flowability, technological plasticity, fracture toughness while preserving high levels of strength properties.
Said alloy comprises (mass. %):
Zn
6.35-8.0
Si
0.01-0.2
Mg
0.5-2.5
Fe
0.06-0.25
Cu
0.8-1.3
Zr
0.07-0.2
Cr
0.001-0.05
Ti
0.03-0.1
Mn
0.001-0.1
Be
0.0001-0.05
and at least one element from the group of alkali-earth metals:
K
0.0001-0.01
Na
0.0001-0.01
Ca
0.0001-0.01
Al-balance
the sum Zr+2Ti≦0.3%, and the ratio Si:Be≧2.