AA 6066, like other 6XXX aluminum series alloys, contains magnesium and silicon in approximate proportions to form Mg2Si, the constituent responsible for the precipitation hardening capability of the alloy. AA6066 develops intermediate strength levels when heat treated and it possesses good formability and corrosion resistance. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength as well as fatigue. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Al-307. Producer or source: Various aluminum companies.