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Materials Database - Engineering Alloys - Aluminum Alloys
Aluminum alloys are typically specified as wrought or cast. Wrought alloys numbered with the International Alloy Designation System use the first four numbers to define the alloying elements. This is followed by a dash and a letter/number combination that defines the heat treatment process. Cast alloys are typically numbered with the Aluminium Association system with the first number specifiying the alloying elements.
Wrought Aluminum Alloys
Pure [1XXX]
Copper [2XXX]
Copper is added to significantly increase strength after heat treatment. Stress corrosion cracking is a concern for this series.
Manganese [3XXX]
Manganese is added to increase strength without sacrificing corrosion resistance.
Silicon [4XXX]
Silicon is added to increase weldability and castability.
Magnesium [5XXX]
Magnesium is used to increase strength while maintaining ductility.
Magnesium-Silicon [6XXX]
Zinc [7XXX]
Zinc is added to achieve the highest strength of all the alloys. Stress corrosion cracking is a concern for this series.
Other [8XXX]
Cast Aluminum Alloys
Pure [1XX]
Copper [2XX]
Silicon-Copper-Magnesium [3XX]
Silicon [4XX]
Magnesium [5XX]
Zinc [7XX]
Tin [8XX]
Other [9XX]
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