7075 aluminum case of Al-Zn-Mg-Cu based hard aluminum alloy 7075 in the late 1940s had been used in aircraft manufacturing, it is still widely used in the aviation industry to obtain ultra high strength wrought aluminum alloy. The feature is good plasticity after solution treatment, heat strengthened particularly effective at below 150 ℃ high strength, and has particularly good low temperature strength; welding performance is poor; there is a tendency to stress corrosion cracking; subject clad aluminum or other protection process to use. Two-stage aging can improve the ability of the alloy resistance to stress corrosion cracking. Plastic in the annealed and quenched just slightly lower than the same state of 2A12. Slightly better than the 7A04, static fatigue plate. Notch sensitivity, stress corrosion better than 7A04, which 7075T651 especially the top grade, known as the aluminum alloy is the most excellent products, high strength, far better than mild steel. This alloy has good mechanical properties and the anode reaction is typical of aircraft aluminum. Mechanical properties Tensile strength 7075 aluminum Mpa Yield strength Mpa Elongation% volume expansion coefficient m3 (.m3.k) ˉ1 20 ℃ volume resistivity conductivity IACS 20 ℃ NΩ.M elastic modulus E / Gpa Hardness HB density kg. mˉ1 524 462 11 68 * 10ˉ6 33 52.2 71 150 2810 two species status, 7075 and 7075 major varieties typical use into sheet, plate, drawing tube, squeeze tubes, rods, type, row, wire, rolling or cold bar, cold wire. States are O status, T6 state, T651 state, T6511 state, T73 status, T7351 state, T7651 state, T76511 state, H13 state. 7075 Typical uses aerospace industry, blow molding (bottles) mode, ultrasonic plastic welding mold, high child golf head, shoe, paper and plastic molding, foam molding, lost wax mold, templates, fixtures, machinery and equipment, tooling and other high-stress structural parts of other resist. Third, the 7075 aluminum Features 1, high-strength heat treatable alloys. 2, good mechanical properties. 3. To good use. 4, ease of processing, good wear resistance. 5, corrosion resistance, good oxidation resistance. 6, anodic oxidation good effect. Fourth, the 7075 heat-treated aluminum and zinc tensile strength is the main alloying elements in 7075, adding magnesium to the alloy containing 3% to 7.5% zinc can be formed a significant strengthening effect of MgZn2, the effect of the heat treatment of the alloy is much better than in Al - Zn binary alloy. Increase in zinc alloy, magnesium content, tensile strength will be further improved, but its resistance to stress corrosion and exfoliation corrosion will fall. Subjected to heat treatment, can reach very high strength characteristics. 7075 material is generally a small amount of copper, chromium and other alloys, which the department to A7075- especially the top grade aluminum alloy, known as the best product in aluminum alloy, high strength, far better than any soft steel. Fifth, the chemical composition of 7075 aluminum silicon Si: 0.40 iron Fe: 0.50 Copper Cu: 1.2-2.0 Mn Mn: 0.30 Mg Mg: 2.1-2.9 chromium Cr: 0.18-0.28 Zinc Zn: 5.1-6.1 Titanium Ti: 0.20 Al Al: I Other amounts: Single: 0.05 Total: 0.15