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K1A Magnesium vs. R31537 Cobalt

K1A magnesium belongs to the magnesium alloys classification, while R31537 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (6, 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 R31537 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 43
220
Elongation at Break, % 13
14 to 23
Fatigue Strength, MPa 39
310 to 480
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 17
87
Tensile Strength: Ultimate (UTS), MPa 180
1000 to 1340
Tensile Strength: Yield (Proof), MPa 51
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 350
320
Melting Completion (Liquidus), °C 650
1360
Melting Onset (Solidus), °C 650
1290
Specific Heat Capacity, J/kg-K 1000
450
Thermal Conductivity, W/m-K 120
13
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
8.4
Embodied Carbon, kg CO2/kg material 24
8.1
Embodied Energy, MJ/kg 170
110
Embodied Water, L/kg 970
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 17
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 30
780 to 1990
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 73
24
Strength to Weight: Axial, points 31
33 to 44
Strength to Weight: Bending, points 43
26 to 32
Thermal Diffusivity, mm2/s 75
3.4
Thermal Shock Resistance, points 11
24 to 32

Alloy Composition


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Carbon (C), % 0
0 to 0.14
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 0
58.9 to 69
Iron (Fe), % 0
0 to 0.75
Magnesium (Mg), % 98.7 to 99.6
0
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Silicon (Si), % 0
0 to 1.0
Zirconium (Zr), % 0.4 to 1.0
0
Residuals, % 0 to 0.3
0