7075 aluminium alloy
alloy
7075 aluminium alloy (AA7075) is an aluminium alloy with zinc as the primary alloying element. It has excellent mechanical properties and exhibits good ductility and resistance to fatigue as well as high strength and toughness. It is more susceptible to embrittlement than many other aluminium alloys because of microsegregation, but has significantly better corrosion resistance than the alloys from the 2000 series. It is one of the most commonly used aluminium alloys for highly stressed structural applications and has been extensively used in aircraft structural parts.
7075 aluminium alloy's composition includes roughly 5.6–6.1% zinc, 2.1–2.5% magnesium, 1.2–1.6% copper, and less than a half percent of silicon, iron, manganese, titanium, chromium, and other metals. It is produced in many tempers, some of which are 7075-0, 7075-T6, 7075-T651.
The first 7075 was developed by a Japanese company, Sumitomo Metal, in 1935, and eventually used for airframe production in the Imperial Japanese Navy. 7075 was reverse engineered by Alcoa in 1943, after examining a captured Japanese aircraft. 7075 was standardized for aerospace use in 1945.
Basic properties
Aluminium 7075A has a density of 2.810 g/cm3.
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