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K1A Magnesium vs. R31233 Cobalt

K1A magnesium belongs to the magnesium alloys classification, while R31233 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (4, 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 R31233 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 43
220
Elongation at Break, % 13
17
Fatigue Strength, MPa 39
220
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 17
85
Tensile Strength: Ultimate (UTS), MPa 180
1020
Tensile Strength: Yield (Proof), MPa 51
420

Thermal Properties

Latent Heat of Fusion, J/g 350
320
Melting Completion (Liquidus), °C 650
1350
Melting Onset (Solidus), °C 650
1330
Specific Heat Capacity, J/kg-K 1000
440
Thermal Conductivity, W/m-K 120
12
Thermal Expansion, µm/m-K 27
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 30
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 170
2.1

Otherwise Unclassified Properties

Density, g/cm3 1.6
8.6
Embodied Carbon, kg CO2/kg material 24
8.4
Embodied Energy, MJ/kg 170
110
Embodied Water, L/kg 970
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 17
140
Resilience: Unit (Modulus of Resilience), kJ/m3 30
410
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 73
23
Strength to Weight: Axial, points 31
33
Strength to Weight: Bending, points 43
26
Thermal Diffusivity, mm2/s 75
3.2
Thermal Shock Resistance, points 11
25

Alloy Composition


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Boron (B), % 0
0 to 0.015
Carbon (C), % 0
0.020 to 0.1
Chromium (Cr), % 0
23.5 to 27.5
Cobalt (Co), % 0
44.7 to 63.3
Iron (Fe), % 0
1.0 to 5.0
Magnesium (Mg), % 98.7 to 99.6
0
Manganese (Mn), % 0
0.1 to 1.5
Molybdenum (Mo), % 0
4.0 to 6.0
Nickel (Ni), % 0
7.0 to 11
Nitrogen (N), % 0
0.030 to 0.12
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0
0.050 to 1.0
Sulfur (S), % 0
0 to 0.020
Tungsten (W), % 0
1.0 to 3.0
Zirconium (Zr), % 0.4 to 1.0
0
Residuals, % 0 to 0.3
0