AZ81A Magnesium vs. S15700 Stainless Steel
AZ81A magnesium belongs to the magnesium alloys classification, while S15700 stainless steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (4, 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 AZ81A magnesium and the bottom bar is S15700 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 55 | |
| 200 to 460 |
| Elastic (Young's, Tensile) Modulus, GPa | 46 | |
| 200 |
| Elongation at Break, % | 3.0 to 8.8 | |
| 1.1 to 29 |
| Fatigue Strength, MPa | 78 to 80 | |
| 370 to 770 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 18 | |
| 77 |
| Shear Strength, MPa | 91 to 130 | |
| 770 to 1070 |
| Tensile Strength: Ultimate (UTS), MPa | 160 to 240 | |
| 1180 to 1890 |
| Tensile Strength: Yield (Proof), MPa | 84 | |
| 500 to 1770 |
Thermal Properties
| Latent Heat of Fusion, J/g | 350 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 130 | |
| 870 |
| Melting Completion (Liquidus), °C | 600 | |
| 1440 |
| Melting Onset (Solidus), °C | 500 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 990 | |
| 480 |
| Thermal Conductivity, W/m-K | 84 | |
| 16 |
| Thermal Expansion, µm/m-K | 27 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 12 | |
| 2.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 65 | |
| 2.6 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 12 | |
| 15 |
| Density, g/cm3 | 1.7 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 23 | |
| 3.4 |
| Embodied Energy, MJ/kg | 160 | |
| 47 |
| Embodied Water, L/kg | 990 | |
| 140 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 4.0 to 17 | |
| 17 to 270 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 77 to 78 | |
| 640 to 4660 |
| Stiffness to Weight: Axial, points | 15 | |
| 14 |
| Stiffness to Weight: Bending, points | 70 | |
| 25 |
| Strength to Weight: Axial, points | 26 to 39 | |
| 42 to 67 |
| Strength to Weight: Bending, points | 38 to 50 | |
| 32 to 43 |
| Thermal Diffusivity, mm2/s | 50 | |
| 4.2 |
| Thermal Shock Resistance, points | 9.1 to 14 | |
| 39 to 63 |
Alloy Composition
| Aluminum (Al), % | 7.0 to 8.1 | |
| 0.75 to 1.5 |
| Carbon (C), % | 0 | |
| 0 to 0.090 |
| Chromium (Cr), % | 0 | |
| 14 to 16 |
| Copper (Cu), % | 0 to 0.1 | |
| 0 |
| Iron (Fe), % | 0 | |
| 69.6 to 76.8 |
| Magnesium (Mg), % | 89.8 to 92.5 | |
| 0 |
| Manganese (Mn), % | 0.13 to 0.35 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0 | |
| 2.0 to 3.0 |
| Nickel (Ni), % | 0 to 0.010 | |
| 6.5 to 7.7 |
| Phosphorus (P), % | 0 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 0.3 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Zinc (Zn), % | 0.4 to 1.0 | |
| 0 |
| Residuals, % | 0 to 0.3 | |
| 0 |