AA 6061 contains silicon and magnesium in approximate proportions to form magnesium silicide which is the precipitation hardening constituent. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength as well as fatigue. It also includes information on low and high temperature performance, and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Al-303. Producer or source: Various aluminum companies.