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K1A Magnesium vs. SAE-AISI 8642 Steel

K1A magnesium belongs to the magnesium alloys classification, while SAE-AISI 8642 steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, 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 K1A magnesium and the bottom bar is SAE-AISI 8642 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 43
190
Elongation at Break, % 13
23
Fatigue Strength, MPa 39
270
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 17
73
Shear Strength, MPa 55
370
Tensile Strength: Ultimate (UTS), MPa 180
580
Tensile Strength: Yield (Proof), MPa 51
380

Thermal Properties

Latent Heat of Fusion, J/g 350
250
Maximum Temperature: Mechanical, °C 120
410
Melting Completion (Liquidus), °C 650
1460
Melting Onset (Solidus), °C 650
1420
Specific Heat Capacity, J/kg-K 1000
470
Thermal Conductivity, W/m-K 120
39
Thermal Expansion, µm/m-K 27
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 30
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 170
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 13
2.6
Density, g/cm3 1.6
7.8
Embodied Carbon, kg CO2/kg material 24
1.5
Embodied Energy, MJ/kg 170
20
Embodied Water, L/kg 970
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 17
120
Resilience: Unit (Modulus of Resilience), kJ/m3 30
390
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 73
24
Strength to Weight: Axial, points 31
20
Strength to Weight: Bending, points 43
20
Thermal Diffusivity, mm2/s 75
10
Thermal Shock Resistance, points 11
17

Alloy Composition


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Carbon (C), % 0
0.4 to 0.45
Chromium (Cr), % 0
0.4 to 0.6
Iron (Fe), % 0
96.6 to 97.8
Magnesium (Mg), % 98.7 to 99.6
0
Manganese (Mn), % 0
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Nickel (Ni), % 0
0.4 to 0.7
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Zirconium (Zr), % 0.4 to 1.0
0
Residuals, % 0 to 0.3
0