4145 Aluminum vs. AWS BAg-9
4145 aluminum belongs to the aluminum alloys classification, while AWS BAg-9 belongs to the otherwise unclassified metals. There are 17 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.
For each property being compared, the top bar is 4145 aluminum and the bottom bar is AWS BAg-9.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 73 | |
| 82 |
| Poisson's Ratio | 0.33 | |
| 0.35 |
| Shear Modulus, GPa | 28 | |
| 31 |
| Tensile Strength: Ultimate (UTS), MPa | 120 | |
| 140 |
Thermal Properties
| Brazing Temperature, °C | 570 to 600 | |
| 720 to 840 |
| Latent Heat of Fusion, J/g | 540 | |
| 130 |
| Melting Completion (Liquidus), °C | 590 | |
| 720 |
| Melting Onset (Solidus), °C | 520 | |
| 670 |
| Specific Heat Capacity, J/kg-K | 880 | |
| 290 |
| Thermal Expansion, µm/m-K | 21 | |
| 20 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.8 | |
| 9.6 |
| Embodied Energy, MJ/kg | 140 | |
| 980 |
Common Calculations
| Stiffness to Weight: Axial, points | 14 | |
| 4.8 |
| Stiffness to Weight: Bending, points | 50 | |
| 15 |
| Strength to Weight: Axial, points | 12 | |
| 4.1 |
| Strength to Weight: Bending, points | 19 | |
| 6.3 |
| Thermal Shock Resistance, points | 5.5 | |
| 6.0 |
Alloy Composition
| Aluminum (Al), % | 83 to 87.4 | |
| 0 |
| Chromium (Cr), % | 0 to 0.15 | |
| 0 |
| Copper (Cu), % | 3.3 to 4.7 | |
| 19 to 21 |
| Iron (Fe), % | 0 to 0.8 | |
| 0 |
| Magnesium (Mg), % | 0 to 0.15 | |
| 0 |
| Manganese (Mn), % | 0 to 0.15 | |
| 0 |
| Silicon (Si), % | 9.3 to 10.7 | |
| 0 |
| Silver (Ag), % | 0 | |
| 64 to 66 |
| Zinc (Zn), % | 0 to 0.2 | |
| 13 to 17 |
| Residuals, % | 0 | |
| 0 to 0.15 |