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AM50A Magnesium vs. SAE-AISI M7 Steel

AM50A magnesium belongs to the magnesium alloys classification, while SAE-AISI M7 steel belongs to the iron alloys. There are 21 material properties with values for both materials. Properties with values for just one material (11, 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 AM50A magnesium and the bottom bar is SAE-AISI M7 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 17
77
Tensile Strength: Ultimate (UTS), MPa 210
760 to 2210

Thermal Properties

Latent Heat of Fusion, J/g 350
270
Melting Completion (Liquidus), °C 620
1560
Melting Onset (Solidus), °C 570
1510
Specific Heat Capacity, J/kg-K 1000
450
Thermal Conductivity, W/m-K 65
28
Thermal Expansion, µm/m-K 26
12

Otherwise Unclassified Properties

Base Metal Price, % relative 12
18
Density, g/cm3 1.7
8.1
Embodied Carbon, kg CO2/kg material 23
8.9
Embodied Energy, MJ/kg 160
130
Embodied Water, L/kg 990
100

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 71
24
Strength to Weight: Axial, points 35
26 to 76
Strength to Weight: Bending, points 47
23 to 47
Thermal Diffusivity, mm2/s 39
7.8
Thermal Shock Resistance, points 13
24 to 69

Alloy Composition

Aluminum (Al), % 4.4 to 5.4
0
Carbon (C), % 0
1.0 to 1.1
Chromium (Cr), % 0
3.5 to 4.0
Copper (Cu), % 0 to 0.010
0 to 0.25
Iron (Fe), % 0 to 0.0040
79.8 to 83.8
Magnesium (Mg), % 93.7 to 95.3
0
Manganese (Mn), % 0.26 to 0.6
0.15 to 0.4
Molybdenum (Mo), % 0
8.2 to 9.2
Nickel (Ni), % 0 to 0.0020
0 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.1
0.2 to 0.55
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
1.4 to 2.1
Vanadium (V), % 0
1.8 to 2.3
Zinc (Zn), % 0 to 0.22
0