Aluminum (Al) balance
Chromium (Cr)≤0.04
Zirconium (Zr)0.08～0.15
Zinc (Zn)5.7～6.7
Silicon (Si)≤0.12
Iron (Fe)0.000～0.150
Manganese (Mn)≤0.10
Magnesium (Mg) 1.9～2.6
Titanium (Ti)≤0.06
Copper (Cu)2.0～2.6
Mechanical behavior:
Condition, tensile strength, yield strength, elongation, hardness, (a) shear strength, fatigue strength (b)
Note: (a) Load 500kg, 10mm diameter ball; (b) R.R.Moore type test, 5*108 cycles of full reverse stress.
Other properties:
Density: 2.83g/cm3 (0.102lb/in3) at 20℃ (68℉).
Annealing temperature 415℃ (775℉)
Solid solution temperature 475℃ (890℉)
Aging temperature 120-175℃ (250-350℉)
Characteristics and scope of application:
7050 is a high-strength heat-treatable alloy with extremely high strength and resistance to spalling corrosion and stress corrosion cracking. Commonly used in aircraft structural parts for medium and thick plate extrusions, free forgings and die forgings. The alloy requirements for manufacturing such parts are: strong resistance to spalling corrosion and stress corrosion cracking, fracture toughness and fatigue resistance.