AZ91A Magnesium vs. Nickel 685
AZ91A magnesium belongs to the magnesium alloys classification, while nickel 685 belongs to the nickel alloys. There are 29 material properties with values for both materials. Properties with values for just one material (5, 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 AZ91A magnesium and the bottom bar is nickel 685.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 63 | |
| 350 |
| Elastic (Young's, Tensile) Modulus, GPa | 46 | |
| 200 |
| Elongation at Break, % | 5.0 | |
| 17 |
| Fatigue Strength, MPa | 99 | |
| 470 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 18 | |
| 77 |
| Shear Strength, MPa | 140 | |
| 770 |
| Tensile Strength: Ultimate (UTS), MPa | 240 | |
| 1250 |
| Tensile Strength: Yield (Proof), MPa | 160 | |
| 850 |
Thermal Properties
| Latent Heat of Fusion, J/g | 360 | |
| 320 |
| Maximum Temperature: Mechanical, °C | 130 | |
| 1000 |
| Melting Completion (Liquidus), °C | 600 | |
| 1380 |
| Melting Onset (Solidus), °C | 470 | |
| 1330 |
| Specific Heat Capacity, J/kg-K | 990 | |
| 460 |
| Thermal Conductivity, W/m-K | 73 | |
| 13 |
| Thermal Expansion, µm/m-K | 26 | |
| 12 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 12 | |
| 75 |
| Density, g/cm3 | 1.7 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 22 | |
| 10 |
| Embodied Energy, MJ/kg | 160 | |
| 140 |
| Embodied Water, L/kg | 990 | |
| 340 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 11 | |
| 190 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 280 | |
| 1820 |
| Stiffness to Weight: Axial, points | 15 | |
| 13 |
| Stiffness to Weight: Bending, points | 69 | |
| 23 |
| Strength to Weight: Axial, points | 38 | |
| 42 |
| Strength to Weight: Bending, points | 49 | |
| 31 |
| Thermal Diffusivity, mm2/s | 42 | |
| 3.3 |
| Thermal Shock Resistance, points | 14 | |
| 37 |
Alloy Composition
| Aluminum (Al), % | 8.3 to 9.7 | |
| 1.2 to 1.6 |
| Boron (B), % | 0 | |
| 0.0030 to 0.010 |
| Carbon (C), % | 0 | |
| 0.030 to 0.1 |
| Chromium (Cr), % | 0 | |
| 18 to 21 |
| Cobalt (Co), % | 0 | |
| 12 to 15 |
| Copper (Cu), % | 0 to 0.1 | |
| 0 to 0.5 |
| Iron (Fe), % | 0 | |
| 0 to 2.0 |
| Magnesium (Mg), % | 88.2 to 91.2 | |
| 0 |
| Manganese (Mn), % | 0.13 to 0.5 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0 | |
| 3.5 to 5.0 |
| Nickel (Ni), % | 0 to 0.030 | |
| 49.6 to 62.5 |
| Phosphorus (P), % | 0 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 0.5 | |
| 0 to 0.75 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Titanium (Ti), % | 0 | |
| 2.8 to 3.3 |
| Zinc (Zn), % | 0.35 to 1.0 | |
| 0.020 to 0.12 |