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It is produced in many tempers, some of which are 7075-0, 7075-T6, 7075-T651. The first 7075 was developed in secret by a Japanese company, Sumitomo Metal, in 1935, [3] but reverse engineered by Alcoa in 1943, after examining a captured Japanese aircraft. [4] 7075 was standardized for aerospace use in 1945.
Work was to begin in January 1955 on a 72 million pounds re-roll facility to be supplied by Trentwood. Immediately to follow was a program to upgrade the plant to become capable of all rolling and finishing steps and produce 250 million pounds of sheets and foil from supplies of aluminum pig out of the Chalmette plant near New Orleans.
The three divisions were sheet, extrusion and foundry, with sheet being production of large flat aluminum pieces, extrusion being shaped profiles, and foundry being metal casting production. [5] [4] By the late 1940s, the Aluminum Association would recommence fulfilling its original purpose to promote the general welfare of the industry.
7068 alloy is a 7000 series aluminium-zinc alloy registered with the US Aluminium Association and produced to AMS 4331 (chemical composition and mechanical properties) and AMS 2772 (heat treatment). 7068 alloy ‘A’ and ‘B’ tensile data and fatigue properties have been ratified for inclusion in MIL Handbook 5 / MMPDS.
Aluminum, Al 89 Copper, Cu 2.3 Magnesium, Mg 2.3 Zinc, Zn 6.2 Zirconium, Zr 0.12 Physical Properties. Properties [1] Metric Density 2.6-2.8 g/cm3 Melting point
Can be formed similar to 7075; Annealing provides superior formability and noticeable decline in workability following solution heat treatment; Form in “as-quenched” -W temper condition for best results [3]