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AZ91B Magnesium vs. ACI-ASTM CA15M Steel

AZ91B magnesium belongs to the magnesium alloys classification, while ACI-ASTM CA15M steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (6, 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 AZ91B magnesium and the bottom bar is ACI-ASTM CA15M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
210
Elastic (Young's, Tensile) Modulus, GPa 46
200
Elongation at Break, % 5.0
20
Fatigue Strength, MPa 79
330
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
76
Tensile Strength: Ultimate (UTS), MPa 240
690
Tensile Strength: Yield (Proof), MPa 160
510

Thermal Properties

Latent Heat of Fusion, J/g 360
270
Maximum Temperature: Mechanical, °C 130
760
Melting Completion (Liquidus), °C 600
1450
Melting Onset (Solidus), °C 470
1410
Specific Heat Capacity, J/kg-K 990
480
Thermal Conductivity, W/m-K 73
27
Thermal Expansion, µm/m-K 26
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
3.0
Electrical Conductivity: Equal Weight (Specific), % IACS 58
3.5

Otherwise Unclassified Properties

Base Metal Price, % relative 12
7.5
Density, g/cm3 1.7
7.8
Embodied Carbon, kg CO2/kg material 22
2.1
Embodied Energy, MJ/kg 160
29
Embodied Water, L/kg 990
100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
130
Resilience: Unit (Modulus of Resilience), kJ/m3 280
670
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 38
25
Strength to Weight: Bending, points 49
22
Thermal Diffusivity, mm2/s 42
7.2
Thermal Shock Resistance, points 14
25

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.15
Chromium (Cr), % 0
11.5 to 14
Copper (Cu), % 0 to 0.35
0
Iron (Fe), % 0
82.1 to 88.4
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0 to 1.0
Molybdenum (Mo), % 0
0.15 to 1.0
Nickel (Ni), % 0 to 0.030
0 to 1.0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 0.65
Sulfur (S), % 0
0 to 0.040
Zinc (Zn), % 0.35 to 1.0
0