7 alloys: Zinc is the main alloying elements in series, adding a magnesium alloy containing 3% to -7.5% zinc, and can form a significant strengthening effect of MgZn2, the effect of the heat treatment of the alloy is far better than aluminum - zinc bis Yuan alloys. Increase in zinc alloy, magnesium content, the tensile strength will be further improved, but its resistance to stress corrosion and exfoliation corrosion will fall. After heat treatment, can achieve very high strength characteristics. The Department of Materials usually a small amount of copper, chromium and other alloys, which the department in 7075-T651 aluminum especially the top grade, known as the best product in aluminum alloy, high strength, far better than mild steel. This alloy and having good mechanical properties and the anode reaction. Representative uses include aerospace, tooling, machinery and equipment, fixture, especially for high-manufacture of aircraft structures and other requirements of strength, corrosion resistance and strong high-stress structure. 7075-T6 aluminum chemical composition Cu1.2-2.0-, Si0.4-, Fe0.5-, Mn0.315-, Mg2.1-2.9-, Zn5.1-6.1-, Cr0.4-, Ti0.06 -, mechanical and physical properties of tensile strength 7075-T651 alloy MPa 524 0.2% yield strength MPa 462 Elongation% volume expansion coefficient of 11 m3 (.m3.K) -1 68 * 10-6 20 ° C volume conductivity % IACS 33 20 ° C the resistivity of the mold strong NM 52.2 E / GPa 71 Hardness HB 150 density KG.m-3 2810 7075 and feature 7075 application materials containing mainly zinc. Also belong to the aviation series, aluminum-magnesium, zinc and copper alloy is heat treatable alloy, are super-hard alloy, has good abrasion resistance .7075 eliminate stress, not deformed after processing, warping all super super thick 7075 aluminum ultrasonic detection, can guarantee no blisters, impurities .7075 high thermal conductivity, can shorten the molding time, improve work efficiency. The main feature is the hardness of aluminum alloy 7075 is high hardness, high strength, commonly used in the manufacture of aircraft structures and futures. It requires high strength, corrosion resistance and strong high-stress structural parts, mold manufacturing. Now basically rely on imports, China's production process to be improved technical standards Commentary 7075 GB / T 228 metal materials at room temperature tensile test method GB / T 232 metal bending test method GB / T 3190 Wrought aluminum and aluminum alloy chemical composition of GB / T 3199 aluminum and aluminum alloy products packaging, labeling, transportation, storage GB T 3246.1 deformation microstructure of aluminum and aluminum products, test method T 3880.2 general industrial aluminum and aluminum alloy sheet, strip Part 2 / GB /: Mechanical Properties GB / T 3880.3 general industrial aluminum and aluminum alloy sheet, strip Part 3: size deviation GB / T 6987 (all parts), chemical analysis of aluminum and aluminum alloys GB / T 7999 aluminum and aluminum photovoltaic (photometry) emission spectrometric method GB / T 16865 Wrought aluminum, magnesium and its alloys processed products tensile test specimens with GB T 17432 Wrought aluminum and aluminum alloy chemical analysis sampling methods /