7050 is a high strength heat treatable alloy with high strength and resistance to exfoliation corrosion and stress corrosion cracking performance. Commonly used in aircraft structures for plate extrusions, forged parts and forging parts. Manufacture of such parts of the alloy requirements are: exfoliation corrosion resistance and resistance to stress corrosion cracking, fracture toughness and fatigue resistance are stronger. 7075 series aluminum alloy main alloying elements are zinc, magnesium added to the alloy containing 3% to 75% zinc can be formed a significant strengthening effect of MgZn2, the effect of the heat treatment of the alloy is far better than aluminum and zinc binary alloy Increases zinc alloy magnesium content, tensile stiffness will have to be further improved, but its resistance to stress corrosion and exfoliation corrosion will fall. After heat treatment, can reach very high strength characteristics. The system material usually Add to discuss the copper-chromium alloy. The system in 7075-7651 for the top grade aluminum alloy, known as the best product in aluminum alloy, high strength, far better than mild steel. This alloy has good mechanical properties and the anode reaction. mainly used in aerospace, tooling, machinery and equipment. fixture, particularly for high-aircraft structures and other requirements of high strength, corrosion resistance and strong high-stress structure. 7050 Typical mechanical properties of tensile strength state yield strength Elongation Hardness (a) the shear strength fatigue strength (b) MPa ksi MPa ksi sample thickness 1.6mm (1 / 16in) HB MPa ksi MPa ksi T73510 496 72 434 63 12 135 - - 71 10.4 T7451 524 76 469 68 11 135 303 44 71 10.4 T7651 552 80 490 71 11 135 324 47 71 10.4 Note: (a) load 500kg 10mm diameter ball; (b) RRMoore type test, cycle 5 * 108 full reverse stress. Other properties Density: 20 ℃ (68 ℉) when 2.83g / cm3 (0.102lb / in3). Annealing temperature 415 ℃ (775 ℉) solution temperature 475 ℃ (890 ℉) aging temperature 120-175 ℃ (250-350 ℉) 7050 Chemical composition: aluminum (Al) balance of 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