AZ91B Magnesium vs. Type 4 Magnetic Alloy
AZ91B magnesium belongs to the magnesium alloys classification, while Type 4 magnetic alloy belongs to the nickel alloys. There are 28 material properties with values for both materials. Properties with values for just one material (6, 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 AZ91B magnesium and the bottom bar is Type 4 magnetic alloy.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 46 | |
| 190 |
| Elongation at Break, % | 5.0 | |
| 2.0 to 40 |
| Fatigue Strength, MPa | 79 | |
| 220 to 400 |
| Poisson's Ratio | 0.29 | |
| 0.31 |
| Shear Modulus, GPa | 18 | |
| 73 |
| Shear Strength, MPa | 140 | |
| 420 to 630 |
| Tensile Strength: Ultimate (UTS), MPa | 240 | |
| 620 to 1100 |
| Tensile Strength: Yield (Proof), MPa | 160 | |
| 270 to 1040 |
Thermal Properties
| Latent Heat of Fusion, J/g | 360 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 130 | |
| 900 |
| Melting Completion (Liquidus), °C | 600 | |
| 1420 |
| Melting Onset (Solidus), °C | 470 | |
| 1370 |
| Specific Heat Capacity, J/kg-K | 990 | |
| 440 |
| Thermal Expansion, µm/m-K | 26 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 11 | |
| 2.9 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 58 | |
| 3.0 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 12 | |
| 60 |
| Density, g/cm3 | 1.7 | |
| 8.8 |
| Embodied Carbon, kg CO2/kg material | 22 | |
| 10 |
| Embodied Energy, MJ/kg | 160 | |
| 140 |
| Embodied Water, L/kg | 990 | |
| 210 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 11 | |
| 22 to 200 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 280 | |
| 190 to 2840 |
| Stiffness to Weight: Axial, points | 15 | |
| 12 |
| Stiffness to Weight: Bending, points | 69 | |
| 22 |
| Strength to Weight: Axial, points | 38 | |
| 19 to 35 |
| Strength to Weight: Bending, points | 49 | |
| 18 to 27 |
| Thermal Shock Resistance, points | 14 | |
| 21 to 37 |
Alloy Composition
| Aluminum (Al), % | 8.3 to 9.7 | |
| 0 |
| Carbon (C), % | 0 | |
| 0 to 0.050 |
| Chromium (Cr), % | 0 | |
| 0 to 0.3 |
| Cobalt (Co), % | 0 | |
| 0 to 0.5 |
| Copper (Cu), % | 0 to 0.35 | |
| 0 to 0.3 |
| Iron (Fe), % | 0 | |
| 9.5 to 17.5 |
| Magnesium (Mg), % | 87.9 to 91.2 | |
| 0 |
| Manganese (Mn), % | 0.13 to 0.5 | |
| 0 to 0.8 |
| Molybdenum (Mo), % | 0 | |
| 3.5 to 6.0 |
| Nickel (Ni), % | 0 to 0.030 | |
| 79 to 82 |
| Phosphorus (P), % | 0 | |
| 0 to 0.010 |
| Silicon (Si), % | 0 to 0.5 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 | |
| 0 to 0.020 |
| Zinc (Zn), % | 0.35 to 1.0 | |
| 0 |