Aluminum 7075 is the major alloy in 7000 Series and Zinc is the major alloying element in this series. Aluminum 7075 possesses high static strength and is used in airframe structures and for highly stressed parts. Aluminum 7075 is available in several types of tempers such as T6, T651, T73, T7351 and T76. T6 temper has the highest strength but lowest toughness and resistance to stress-corrosion cracking. Since toughness decreases with a decrease in temperature, the T6 temper is not generally recommended for cryogenic applications.

Stress corrosion cracking of Al7075 alloy processed by equal channel. Stress corrosion cracking, Al 7075. The 7xxx series aluminum alloys (Poulose et al. 7075 aluminium alloy. As is the case for all 7075 aluminum alloys, 7075-0 is highly corrosion. This reduces the susceptibility to stress corrosion cracking.

The T73 temper provides much improved stress-corrosion resistance over T6 temper with a decrease in strength. The T76 temper provides improved exfoliation resistance and limited stress corrosion resistance over T6 temper with some decrease in strength. Alloying content of aluminum 7075 is given in the following chart. Quickbooks 2006 07 on this page. Aluminum 7075 Content (% by weight) Aluminum Alloy Aluminum Silicon Iron Copper Manganese Magnesium Chromium Zinc Titanium Others 7075 87.1 - 91.4 Max 0.40 Max 0.50 1.2 - 2.0 Max 0.30 2.1 - 2.9 0.18 - 0.28 5.1 - 6.1 Max 0.20 Max 0.15 Some of the important temper designations of aluminum 7075 are summarized below.

T6 temper is solution heat treated and then artificially aged. T651 temper is solution heat treated; stress relieved by stretching then artificially aged. T73 temper is solution heat-treated and then artificially overaged in order to achieve the best stress corrosion resistance.