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AZ91D Magnesium vs. Grade N7M Nickel

AZ91D magnesium belongs to the magnesium alloys classification, while grade N7M nickel belongs to the nickel alloys. There are 25 material properties with values for both materials. Properties with values for just one material (9, 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 AZ91D magnesium and the bottom bar is grade N7M nickel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
220
Elongation at Break, % 2.3 to 4.5
22
Fatigue Strength, MPa 74 to 85
190
Poisson's Ratio 0.29
0.31
Shear Modulus, GPa 18
85
Tensile Strength: Ultimate (UTS), MPa 160 to 220
590
Tensile Strength: Yield (Proof), MPa 80 to 130
310

Thermal Properties

Latent Heat of Fusion, J/g 350
320
Maximum Temperature: Mechanical, °C 130
900
Melting Completion (Liquidus), °C 600
1650
Melting Onset (Solidus), °C 490
1590
Specific Heat Capacity, J/kg-K 990
390
Thermal Expansion, µm/m-K 27
9.9

Otherwise Unclassified Properties

Base Metal Price, % relative 12
75
Density, g/cm3 1.7
9.3
Embodied Carbon, kg CO2/kg material 22
16
Embodied Energy, MJ/kg 160
200
Embodied Water, L/kg 990
270

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.2 to 7.7
110
Resilience: Unit (Modulus of Resilience), kJ/m3 69 to 170
220
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
22
Strength to Weight: Axial, points 26 to 34
18
Strength to Weight: Bending, points 38 to 46
17
Thermal Shock Resistance, points 9.5 to 13
19

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.070
Chromium (Cr), % 0
0 to 1.0
Copper (Cu), % 0 to 0.030
0
Iron (Fe), % 0 to 0.0050
0 to 3.0
Magnesium (Mg), % 88.7 to 91.2
0
Manganese (Mn), % 0.15 to 0.5
0 to 1.0
Molybdenum (Mo), % 0
30 to 33
Nickel (Ni), % 0 to 0.0020
60.9 to 70
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.1
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0.35 to 1.0
0