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AS41A Magnesium vs. ACI-ASTM CB7Cu-1 Steel

AS41A magnesium belongs to the magnesium alloys classification, while ACI-ASTM CB7Cu-1 steel belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (5, 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 AS41A magnesium and the bottom bar is ACI-ASTM CB7Cu-1 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
190
Elongation at Break, % 11
5.7 to 11
Fatigue Strength, MPa 100
420 to 590
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 17
76
Tensile Strength: Ultimate (UTS), MPa 230
960 to 1350
Tensile Strength: Yield (Proof), MPa 140
760 to 1180

Thermal Properties

Latent Heat of Fusion, J/g 370
280
Melting Completion (Liquidus), °C 620
1430
Melting Onset (Solidus), °C 570
1500
Specific Heat Capacity, J/kg-K 1000
480
Thermal Conductivity, W/m-K 68
17
Thermal Expansion, µm/m-K 26
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 17
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 92
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 12
13
Density, g/cm3 1.6
7.8
Embodied Carbon, kg CO2/kg material 23
2.6
Embodied Energy, MJ/kg 160
38
Embodied Water, L/kg 980
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 21
71 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 220
1500 to 3590
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 72
25
Strength to Weight: Axial, points 38
34 to 48
Strength to Weight: Bending, points 50
28 to 35
Thermal Diffusivity, mm2/s 41
4.6
Thermal Shock Resistance, points 14
32 to 45

Alloy Composition

Aluminum (Al), % 3.5 to 5.0
0
Carbon (C), % 0
0 to 0.070
Chromium (Cr), % 0
15.5 to 17.7
Copper (Cu), % 0 to 0.060
2.5 to 3.2
Iron (Fe), % 0
72.3 to 78.4
Magnesium (Mg), % 92.8 to 95.8
0
Manganese (Mn), % 0.2 to 0.5
0 to 0.7
Nickel (Ni), % 0 to 0.030
3.6 to 4.6
Niobium (Nb), % 0
0 to 0.35
Nitrogen (N), % 0
0 to 0.050
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0.5 to 1.5
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0 to 0.12
0