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AZ61A Magnesium vs. ACI-ASTM CN7M Steel

AZ61A magnesium belongs to the magnesium alloys classification, while ACI-ASTM CN7M steel belongs to the iron alloys. There are 29 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 AZ61A magnesium and the bottom bar is ACI-ASTM CN7M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
200
Elongation at Break, % 11
44
Fatigue Strength, MPa 130
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 17
77
Tensile Strength: Ultimate (UTS), MPa 280
480
Tensile Strength: Yield (Proof), MPa 170
200

Thermal Properties

Latent Heat of Fusion, J/g 350
310
Maximum Temperature: Mechanical, °C 120
1100
Melting Completion (Liquidus), °C 600
1410
Melting Onset (Solidus), °C 530
1450
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 79
21
Thermal Expansion, µm/m-K 27
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 62
1.8

Otherwise Unclassified Properties

Base Metal Price, % relative 12
32
Density, g/cm3 1.7
8.1
Embodied Carbon, kg CO2/kg material 23
5.6
Embodied Energy, MJ/kg 160
78
Embodied Water, L/kg 980
210

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 27
170
Resilience: Unit (Modulus of Resilience), kJ/m3 310
110
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 46
17
Strength to Weight: Bending, points 56
17
Thermal Diffusivity, mm2/s 47
5.6
Thermal Shock Resistance, points 17
12

Alloy Composition


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Aluminum (Al), % 5.5 to 7.2
0
Carbon (C), % 0
0 to 0.070
Chromium (Cr), % 0
19 to 22
Copper (Cu), % 0 to 0.050
3.0 to 4.0
Iron (Fe), % 0 to 0.0050
37.4 to 48.5
Magnesium (Mg), % 90.3 to 93.9
0
Manganese (Mn), % 0.15 to 0.5
0 to 1.5
Molybdenum (Mo), % 0
2.0 to 3.0
Nickel (Ni), % 0 to 0.0050
27.5 to 30.5
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.1
0 to 1.5
Sulfur (S), % 0
0 to 0.040
Zinc (Zn), % 0.4 to 1.5
0
Residuals, % 0 to 0.3
0