Aluminum alloy has become one of the preferred materials for automobile lightweight due to its high specific strength, good corrosion resistance, formability and weldability. In the automotive industry, automobile lightweight is one of the most important means of energy saving and emission reduction. Limited by the difficulty of sheet metal forming, the all-aluminum body realized by high-cost and low-efficiency sheet metal forming technology is mainly used in high-end sports cars, race cars and luxury cars.
After a long period of development, the most common aluminum alloy sheets used for automobile bodies are 2××× (Al-Cu-Mg) series, 5××× (Al-Mg) series, 6××× (Al-Mg -Si) alloys and 7××× (Al-Zn-Mg-Cu) aluminum alloys.
7075 aluminum sheet is an Al-Zn-Mg-Cu alloy, which can be heat-treated and strengthened. Among them, Zn and Mg mainly play the role of strengthening, and the role of Cu is mainly to improve the corrosion resistance of the alloy. 7075 aluminum plate is a superhard aluminum alloy with very good mechanical properties. The tensile and shear strength can reach more than 600, and the elongation rate can reach as high as 70%.
7075 aluminum alloy is widely used in aerospace and related fields, especially in the manufacture of aircraft structures and other high-stress structures that require high strength and strong corrosion resistance. In recent years, with the "consumption upgrade" and "lightweight" trend, 7075 aluminum has gradually extended from the traditional aerospace and military fields to the fields of mechanical equipment, mold processing, automobiles and even consumer electronics due to its ultra-high performance and practicability.
The main criterion for ultra-high-strength aluminum alloys is the so-called yield strength. 7075 aluminum alloy can be obtained in two tempers T6 and T7. In 7075-T6, a yield point of about 500MPa is reached, while for 7075-T7, the value is about 450MPa. A yield point of 450 to 500 MPa is already a very high value for aluminum alloys
Different parts of race cars have very different requirements for materials. For example, the front and rear parts of a car like front and rear longitudinal beams is required to absorb impacts from the front and rear. The area enclosed by strength and deformation can be roughly considered as the material's ability to absorb energy. Of course, we don't want these energy-absorbing parts to break prematurely during the collision, so a certain elongation is the basic requirement for these parts.
The second need is strength. The intensity should not be so strong that the main energy is transmitted backwards, nor so weak that it cannot absorb enough energy. Proper strength and good deformability are the requirements for these parts. 7000 race car aluminum sheets meets this requirements.
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