6061 aluminum contains small amounts of magnesium and silicon which contribute to its strength, machinability, and weldability. Beyond its strength, this alloy is known for its fatigue resistance and good corrosion resistance, making it one of the most widely used aluminum alloys. It can also be anodized for increased protection. The T6511 form of 6061 aluminum adds stress relieving in extruded bar form to improve stability during machining, though it results in slightly lower strength compared to a cold-finished product in the T651 condition. While both T6 and T6511 share the same base composition and heat treatment, the T6511 temper is processed by stretching and minor straightening, whereas T6 is not stress-relieved.
| Property | Value | Notes |
|---|---|---|
| Material Type | Aluminum-magnesium-silicon alloy | UNS A96061 |
| Density | 0.1lb/in3 | |
| Melting Point | ~582 - 652°C | ~1,080-1,205 °F |
| Hardness (Brinell) | 93 | |
| Tensile Strength | ~290 - 310 MPa | ~42,000 – 45,000 psi |
| Yield Strength | ~240 - 270 MPa | ~35,000 – 39,000 psi |
| Elongation at Break | ~9 - 12% | |
| Modulus of Elasticity | ~69 GPa | ~10 x 10⁶ psi |
| Corrosion Resistance | Good | |
| Magnetism | Non-magnetic | |
| Heat Treatment | T6 is a heat-treated grade | T6511 improves stability |
| Machinability | ||
| Weldability | Good |
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