What Are The Main Elements of 7075 and 2024 Aluminum Sheets

7075 aluminum plate, as a high-quality aluminum alloy, has attracted much attention for its excellent physical properties and wide range of applications. The excellent performance of 7075 aluminum plate is mainly due to its special alloy composition.

Zinc is the main alloying element in the 7075 aluminum plate. By adding magnesium to the alloy containing 3%-7.5% zinc, MgZn2 with significant strengthening effect is formed, thereby greatly improving the heat treatment effect of the alloy.

7075 alloy varieties are divided into aluminum plates, thick plates, stretched tubes, extruded tubes, rods, wire rods, rolled or cold-processed bars, and cold-processed wire rods. The tempers include 7075t73, t7351, t651, t6, t6511, O, H13 temper.

7075 aluminum plate has the highest strength in the T6 state, but the lowest fracture toughness and poor corrosion resistance (especially resistance to intergranular corrosion and stress corrosion). In order to enhance its corrosion resistance, it needs to be over-aged, and the common one is T73 treatment.

The main strengthening phase of 2024 aluminum sheet is S phase (CuMgAl2), followed by θ phase (CuAl2). It is usually used in the T3 state and has the characteristics of high fracture toughness and strong resistance to fatigue crack growth. However, the corrosion resistance (intergranular corrosion) performance in this state is not good enough. The thin plates are generally used after being coated with aluminum, and can also be used with anodization.Alloy 2024-T3 was introduced by Alcoa in 1931. Its Ai-Cu-Mg structural composition allows its yield strength to reach 5ksi, replacing 2017-T4 as the main Series 2 aerospace alloy. 2024 has relatively good fatigue resistance, especially in thick plates, making it suitable for most aircraft structural applications.

Aluminum alloy 2024 t351 has high strength, good cutting performance, high strength, heat resistance, good spot welding, and significant heat treatment strengthening effect. Anodizing and painting methods are used or an aluminum layer is added to the surface to improve its corrosion resistance. It is mainly used for aircraft skeleton components, rivets, wing spars, truck hubs, propeller components, bulkheads and other structural parts as well as working parts within 150℃.