Among these, the 7075 Al alloy is most preferred by the aircraft industry. The composition of this specific Al alloy is 5.1–6.1% zinc, 2.1–2.9% magnesium, 1.2–2.0% copper and less than 0.5% of silicon, iron, manganese, titanium, chromium and other trace metals
The aerospace industry relies most heavily on alloy 7075, which is one of the lightweight aluminum alloys with the highest strength. Like alloy 2024, its ratio of strength to weight is excellent and it is used in parts that will undergo high levels of stress. Alloy 7075 can be heat treated if needed