7075 aluminum sheet is a commonly used grade in the 7xxx aluminum alloys. Zinc is its main alloying element. The addition of magnesium to the alloy containing 3%-7.5% zinc can form MgZn2 with a significant strengthening effect, so that the heat treatment effect of 7075 aluminum is far better than that of the aluminum-zinc binary alloy.
Aluminum plate 7075 is used to manufacture a variety of structural parts, especially aerospace structural parts. It is the most widely used high-strength aluminum alloy today, ranging from the front fuselage truss of the C919 large aircraft to the mobile phone casing. What are aluminum 7075 material properties?
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It is available in various heat treatment tempers: T6, T73, T76, T77. Through a large number of experimental data and theoretical analysis, on the basis of 7075-T6, the aging heat treatment process was used to successfully develop 7075-T73, which is resistant to stress corrosion. Although this material sacrifices part of its static strength, its corrosion resistance has been significantly improved.
Later, 7075-T76 was further developed, which not only obtained stronger corrosion resistance, but also sacrificed a lower static strength than 7075-T73, which improved the comprehensive properties of aluminum alloy materials and became the best corrosion-resistant aluminum alloy.
7075 alloy can be resistance welded, and the long-term working temperature of the workpiece is less than or equal to 125℃. For incomplete annealing of materials or workpieces, the specification is 290°C~320°C, and after holding for 2h~4h, it is air cooled. Complete annealing specification is (390~430)℃/(0.5~1.5)h and it should be cooled down to ≤200℃ with a cooling rate not greater than 30℃/h.
The solution treatment temperature of 7075 alloy sheet is 460℃~490℃, and the treatment temperature of aluminum sheet should be close to the lower limit, and the number of repeated treatments should not be more than 2 times, so as to prevent alloy elements from diffusing through the aluminum clad layer and reducing the corrosion resistance of the material.
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