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AZ91D Magnesium vs. EN 1.6956 Steel

AZ91D magnesium belongs to the magnesium alloys classification, while EN 1.6956 steel belongs to the iron alloys. There are 32 material properties with values for both materials. Properties with values for just one material (3, 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 EN 1.6956 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 60 to 80
370
Elastic (Young's, Tensile) Modulus, GPa 46
190
Elongation at Break, % 2.3 to 4.5
9.6
Fatigue Strength, MPa 74 to 85
680
Impact Strength: V-Notched Charpy, J 2.7
25
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
73
Shear Strength, MPa 120 to 140
730
Tensile Strength: Ultimate (UTS), MPa 160 to 220
1230
Tensile Strength: Yield (Proof), MPa 80 to 130
1120

Thermal Properties

Latent Heat of Fusion, J/g 350
250
Maximum Temperature: Mechanical, °C 130
440
Melting Completion (Liquidus), °C 600
1460
Melting Onset (Solidus), °C 490
1420
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 78
46
Thermal Expansion, µm/m-K 27
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
8.0
Electrical Conductivity: Equal Weight (Specific), % IACS 58
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 12
5.0
Density, g/cm3 1.7
7.9
Embodied Carbon, kg CO2/kg material 22
2.2
Embodied Energy, MJ/kg 160
31
Embodied Water, L/kg 990
60

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
3320
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 26 to 34
43
Strength to Weight: Bending, points 38 to 46
32
Thermal Diffusivity, mm2/s 45
12
Thermal Shock Resistance, points 9.5 to 13
36

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.28 to 0.38
Chromium (Cr), % 0
1.0 to 1.7
Copper (Cu), % 0 to 0.030
0
Iron (Fe), % 0 to 0.0050
92.4 to 95.3
Magnesium (Mg), % 88.7 to 91.2
0
Manganese (Mn), % 0.15 to 0.5
0.15 to 0.4
Molybdenum (Mo), % 0
0.3 to 0.6
Nickel (Ni), % 0 to 0.0020
2.9 to 3.8
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 0.1
0 to 0.4
Sulfur (S), % 0
0 to 0.035
Vanadium (V), % 0
0.080 to 0.25
Zinc (Zn), % 0.35 to 1.0
0