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 7075 aluminum 
 7075 aluminum is a cold finished aluminum wrought alloy, high strength, better than mild steel. 7075 is a commercial one of the most powerful alloy. General corrosion resistance, good mechanical properties and the anode reaction. Small grain makes deep drilling, tool wear, thread rolling and differentiated. 
 I. Introduction 
 7075 aluminum is a super-hard aluminum, 7075 alloy of Al-Zn-Mg-Cu system is the end of the 1940s had been used in aircraft manufacturing is still on the aviation industry to be widely used in ultra-high strength wrought aluminum alloy. Which is characterized, after solution treatment, good plasticity, the effect of heat treatment to strengthen, especially below 150 ° C, high strength, and particularly good low temperature strength; poor welding performance; stress corrosion cracking tendency; subject clad aluminum, or other conservation treatment to use. The two-stage aging can improve the ability of the alloy resistance to stress corrosion cracking. Annealing and quenching the plastic state is slightly lower than the same state 2A12 just slightly better than the 7A04 sheet static fatigue notch sensitivity, stress corrosion cracking than 7A04, which 7075T651 especially the top grade, known as the aluminum alloy in the most excellent product, high strength, better than mild steel. This alloy has good mechanical properties and the anode reaction is typical of aircraft aluminum. 
 7075 aluminum mechanical properties 
 Tensile Strength Mpa yield strength Mpa Elongation% volume expansion coefficient m3 (. M3.k) ˉ 1 20 ° C volume conductivity of IACS 20 ° C resistivity NΩ.M elastic modulus E / Gpa hardness HB density kg.m ˉ 1 
 524 462 11 68 * 10 ˉ 6 33 52.2 71 150 2810 

 Second, the 7075 varieties of state and typical use 
 7075 varieties are divided into sheet, plate, stretching tubes, extruded tubes, rods, profiles, row, wire, rolled or cold bar, cold wire. The state O status, T6, T651 status, the T6511 state, state T73, T7351 - state, T7651 state, the T76511 state, of H13 state. 
 7075 A typical use of the aerospace industry, blow molding (bottles) mode, ultrasonic plastic welding mold, high child Cardiff ball, shoe molds, paper and plastic mold, foam molding, lost wax mold, templates, fixtures, machinery and equipment, mold other resist high stress structure. 
 , 7075 aluminum characteristics 
 A high-strength heat treatable alloys. 
 2, good mechanical properties. 
 3, can be used. 
 4, ease of processing, good wear resistance. 
 5, the corrosion resistance, good oxidation resistance. 
 6, the anodic oxidation effect. 
 , 7075 aluminum tensile strength and heat treatment 
 Zinc is 7075 in the major alloying elements, add to the 3% -7.5% zinc alloy magnesium, can form a significant strengthening effect MgZn2 the alloy heat treatment effect will be far better than in the Al - Zn binary alloy. 
 Ability to improve the alloy of zinc and magnesium content, the tensile strength will be further improved, but its resistance to stress corrosion and resistance to exfoliation corrosion will fall. 
 Subjected to heat treatment, can reach very high strength characteristics. 7075 materials are generally a small amount of copper, chromium alloy, A7075-aluminum alloy is particularly the Department of the top grade, known as the best product in the aluminum alloy, high strength, far better than any soft steel. 
 5, 7075 aluminum chemical composition 
 Silicon of Si: 0.40 
 Iron of Fe: 0.50 
 Copper Cu :1.2-2 .0 
 Manganese of Mn: 0.30 
 Magnesium of Mg :2.1-2 .9 
 Chromium of Cr :0.18-0 .28 
 Zinc Zn :5.1-6 .1 
 Titanium of Ti: 0.20 
 Al of Al: margin 
 Other: 
 Single: 0.05 Total: 0.15 
 Six, the significance of 7075 aluminum grades 
 In aluminum alloy grades represent the meaning, the following is an example in accordance with the 7075T651 aluminum grades. The first seven groups of aluminum and aluminum alloys - aluminum and zinc magnesium alloy. Aluminum and aluminum alloy group is divided into nine categories. 
 First class: 1 Department: Industrial pure aluminum 
 The second category: 2 Department: Al-Cu alloys 
 The third category: 3 Series: aluminum fierce alloy 
 Class 4: 4 Department: Al-Si alloy 
 Class 5: 5 Department: Al-Mg alloy 
 VI: 6 Series: Mg-Si alloy 
 VII: 7 series: magnesium aluminum zinc copper alloy 
 Class 8: 8 Department: other alloys 
 Class 9: Department: spare alloy 
 0 indicates the control of the content of alloying elements or impurities limit: 0 indicates the original alloy, the impurity limit content no special control, 1-modified alloy, said one or more individual impurities or limit content of alloying elements special controls. 
 24 represents the different alloys: decimal point behind the two lowest aluminum alloy content, such as 1050 aluminum content of 99.50%, double-digit no special significance, and only used to identify the different alloys in the same group. 
 T651 said heat treatment. T behind the general with one or more than one number, such as T6, T6 heat treatment. The different figures represent the different heat treatment. 51 said to eliminate the internal stress state.