24 July 2021 6000 Series Aluminum Alloy
6951 Aluminum Alloy Coil
6951 aluminum alloy is a Al-Mg-Si based system and is used as forgings and extrusions. The alloy is heat treatable. The microstructure has Mg2Si precipitates in addition to undissolved intermetallic particles consisting of Fe and Mn. 6951 aluminum alloy belongs to the 6000 series alloy class, which means its major alloy includes magnesium and silicon. Its modification includes 97.2% aluminum with magnesium, silicon, and iron among its major alloys with the addition of copper, manganese, and zinc. This alloy adds strength to increase sag resistance and makes it heat treatable (metal becomes stronger through heating and cooling).
Chemical Composition:
| Chemical Elements | Original Value |
|---|---|
| Aluminum, Al | <= 97 % |
| Copper, Cu | 0.15 - 0.40 % |
| Iron, Fe | <= 0.80 % |
| Magnesium, Mg | 0.40 - 0.80 % |
| Manganese, Mn | <= 0.10 % |
| Other, each | <= 0.05 % |
| Other, total | <= 0.15 % |
| Silicon, Si | 0.20 - 0.50 % |
| Zinc, Zn | <= 0.20 % |
Mechanical Properties:
| Mechanical Properties | Original Value | Comments |
|---|---|---|
| Hardness, Brinell | 82 | 500 kg load with 10 mm ball |
| Hardness, Knoop | 106 | Converted from Brinell Hardness Value |
| Hardness, Rockwell A | 35.5 | Converted from Brinell Hardness Value |
| Hardness, Rockwell B | 50 | Converted from Brinell Hardness Value |
| Hardness, Vickers | 92 | Converted from Brinell Hardness Value |
| Tensile Strength, Ultimate | 270 MPa | |
| Tensile Strength, Yield | 230 MPa | |
| Elongation at Break | 13 % | In 5 cm; Sample 1.6 mm thick |
| Modulus of Elasticity | 69.0 GPa | Average of Tension and Compression. In Al alloys, the compressive modulus is typically 2% greater than the tensile modulus. Estimated from trends in similar Al alloys. |
| Poissons Ratio | 0.33 | Estimated from trends in similar Al alloys. |
| Shear Modulus | 26.0 GPa | Estimated from similar Al alloys. |
Thermal Properties:
| Thermal Properties | Original Value | Comments |
|---|---|---|
| CTE, linear | 13.0 µin/in-°F @Temperature 20.0 - 100 °C | AA; Typical; average over range |
| 25.0 µm/m-°C @Temperature 20.0 - 300 °C | ||
| Specific Heat Capacity | 0.890 J/g-°C | Estimated from trends in similar Al alloys. |
| Thermal Conductivity | 1370 BTU-in/hr-ft²-°F | AA; Typical at 77°F |
| Melting Point | 1140 - 1210 °F | AA; Typical range based on typical composition for wrought products >= 1/4 in. thickness |
| Solidus | 1140 °F | AA; Typical |
| Liquidus | 1210 °F | AA; Typical |