The main alloying element in 7075 aluminum is zinc. 7075 aluminum was the first Al-Zn-Mg-Cu high-strength alloy that utilized the addition of chromium as an alloying element, resulting in good stress-corrosion cracking resistance for sheet products. Although 7075 Aluminum has no weldability, a low level of corrosion resistance and only offers average performance this alloy offers considerable fatigue strength. With a high strength-to-density ratio, 7075 alloys are often used in applications such as rock climbing equipment, hang glider airframes, and military rifles. Not surprisingly, 7075 aluminum is still considered the go-to alloy for the aircraft and aerospace industries today.
7075 aluminum sheet is one of the highest strength aluminum alloys available Its strength-to weight ratio is excellent and it is ideally used for highly stressed parts. It may be formed in the annealed condition and subsequently heat treated. Spot or flash welding can be used, although arc and gas welding are not recommended. It is available in the clad form to improve the corrosion resistance with the over-all high strength being only moderately affected. Applications: Used where highest strength
An aluminum alloy best suited for aerospace and aviation applications is 7075 T651. This tempered alloy has a high tensile strength which makes it particularly applicable for certain high-strength applications.