6069 Aluminum Alloy

Alloy 6069 is a 6000 series heat-treatable Mg-Si-Cu aluminum alloy. Its ultimate tensile strength and yield strength under T6 conditions are about 40% higher than those of 6061 alloy, which is basically equal to the tensile properties of 6013-T6 plates and the corrosion-resistant does not seem inferior to 6061.
When the heat treatment conditions of 6069 aluminum alloy are changed, it can provide a wider range of mechanical properties. It should be noted that its eutectic melting temperature is 579oC. The recommended solution heat treatment conditions are 565oC×1.5 hours, while the aging heat treatment conditions are 171oC×16 hours.

Main compositionMgCuSiCrVAl
60691.40.750.90.20.2Balance
6069composition (wt.%)MinMax
Mg1.21.6
Si0.61.2
Cu0.551.0
V0.10.3
Cr0.050.3
Ti--0.1
Fe--0.4
Mn--0.05
Zn0.05
Sr--0.05
AlBalance

Mechanical properties:

AlloyT.S. (MPa)Y.S. (MPa)Elongation (%)Density (gcm3)
6069-T6448414152.72

Application:
6069 aluminum alloy can be used in bicycle frame tubes, bicycle rim profiles, and hot extruded profiles for high-pressure seamless gas containers.

References:

1.AIWT, Aerospace Structure Metals Handbook, Nonferrous Alloys, 6069Al

2.Matweb, datasheet.

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