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AZ91D Magnesium vs. SAE-AISI 1080 Steel

AZ91D magnesium belongs to the magnesium alloys classification, while SAE-AISI 1080 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 AZ91D magnesium and the bottom bar is SAE-AISI 1080 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 60 to 80
220 to 260
Elastic (Young's, Tensile) Modulus, GPa 46
190
Elongation at Break, % 2.3 to 4.5
11
Fatigue Strength, MPa 74 to 85
300 to 360
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
72
Shear Strength, MPa 120 to 140
460 to 520
Tensile Strength: Ultimate (UTS), MPa 160 to 220
770 to 870
Tensile Strength: Yield (Proof), MPa 80 to 130
480 to 590

Thermal Properties

Latent Heat of Fusion, J/g 350
250
Maximum Temperature: Mechanical, °C 130
400
Melting Completion (Liquidus), °C 600
1450
Melting Onset (Solidus), °C 490
1410
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 78
51
Thermal Expansion, µm/m-K 27
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
9.6
Electrical Conductivity: Equal Weight (Specific), % IACS 58
11

Otherwise Unclassified Properties

Base Metal Price, % relative 12
1.8
Density, g/cm3 1.7
7.8
Embodied Carbon, kg CO2/kg material 22
1.4
Embodied Energy, MJ/kg 160
19
Embodied Water, L/kg 990
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.2 to 7.7
80 to 84
Resilience: Unit (Modulus of Resilience), kJ/m3 69 to 170
610 to 920
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 26 to 34
27 to 31
Strength to Weight: Bending, points 38 to 46
24 to 26
Thermal Diffusivity, mm2/s 45
14
Thermal Shock Resistance, points 9.5 to 13
25 to 29

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.75 to 0.88
Copper (Cu), % 0 to 0.030
0
Iron (Fe), % 0 to 0.0050
98.1 to 98.7
Magnesium (Mg), % 88.7 to 91.2
0
Manganese (Mn), % 0.15 to 0.5
0.6 to 0.9
Nickel (Ni), % 0 to 0.0020
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.1
0
Sulfur (S), % 0
0 to 0.050
Zinc (Zn), % 0.35 to 1.0
0