Structure and Basic Mechanical Properties of Wrought Age-Hardenable Aluminium Alloys

7 Structure and Basic Mechanical Properties of Wrought Age-Hardenable Aluminium Alloys 

Due to the Al—Si eutectic (Fig. 3.1-12), these alloys, containing 5 to 20 wt% Si, have good casting 

These alloys contain about 5 wt%, 7 wt%, or 10 wt% Si and between 0.3 and 0.5 wt% Mg. The optimum amount of Mg decreases with increasing Si content. Mg causes high strength and a moderate ductility depending on the 

They contain 4 to 7wt% Zn and 0.3 to 0.7 wt% Mg. They can be naturally or artificially age hardened in the as-cast condition, without the need for prior solution treatment. Mg has a significant effect on the mechanical properties in the aged condition (Fig. 3.1-34). If the Mg content is limited, Al—Zn—Mg casting alloys can exhibit particularly good elongation to fracture. 

Tensile strength Rm (MPa) Elongation to fracture A (%) Tensile strength R (MPa) Elongation to fracture A (%) 

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