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 composition | Mg | Cu | Si | Cr | V | Al |
|---|---|---|---|---|---|---|
| 6069 | 1.4 | 0.75 | 0.9 | 0.2 | 0.2 | Balance |
| 6069composition (wt.%) | Min | Max |
|---|---|---|
| Mg | 1.2 | 1.6 |
| Si | 0.6 | 1.2 |
| Cu | 0.55 | 1.0 |
| V | 0.1 | 0.3 |
| Cr | 0.05 | 0.3 |
| Ti | -- | 0.1 |
| Fe | -- | 0.4 |
| Mn | -- | 0.05 |
| Zn | 0.05 | |
| Sr | -- | 0.05 |
| Al | Balance | |
Mechanical properties：
| Alloy | T.S. (MPa) | Y.S. (MPa) | Elongation (%) | Density (gcm3) |
|---|---|---|---|---|
| 6069-T6 | 448 | 414 | 15 | 2.72 |
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.
