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AZ91A Magnesium vs. SAE-AISI 1137 Steel

AZ91A magnesium belongs to the magnesium alloys classification, while SAE-AISI 1137 steel belongs to the iron alloys. There are 31 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 AZ91A magnesium and the bottom bar is SAE-AISI 1137 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
200 to 210
Elastic (Young's, Tensile) Modulus, GPa 46
190
Elongation at Break, % 5.0
11 to 17
Fatigue Strength, MPa 99
250 to 400
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
73
Shear Strength, MPa 140
430 to 460
Tensile Strength: Ultimate (UTS), MPa 240
700 to 760
Tensile Strength: Yield (Proof), MPa 160
370 to 650

Thermal Properties

Latent Heat of Fusion, J/g 360
250
Maximum Temperature: Mechanical, °C 130
400
Melting Completion (Liquidus), °C 600
1460
Melting Onset (Solidus), °C 470
1420
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 73
51
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
10
Electrical Conductivity: Equal Weight (Specific), % IACS 52
12

Otherwise Unclassified Properties

Base Metal Price, % relative 12
1.9
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
48

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
81 to 100
Resilience: Unit (Modulus of Resilience), kJ/m3 280
360 to 1130
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 38
25 to 27
Strength to Weight: Bending, points 49
22 to 24
Thermal Diffusivity, mm2/s 42
14
Thermal Shock Resistance, points 14
21 to 23

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.32 to 0.39
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0
97.8 to 98.3
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
1.4 to 1.7
Nickel (Ni), % 0 to 0.030
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.5
0
Sulfur (S), % 0
0.080 to 0.13
Zinc (Zn), % 0.35 to 1.0
0