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K1A Magnesium vs. R30012 Cobalt

K1A magnesium belongs to the magnesium alloys classification, while R30012 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 R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 43
220
Elongation at Break, % 13
1.0
Fatigue Strength, MPa 39
320
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 17
86
Tensile Strength: Ultimate (UTS), MPa 180
830
Tensile Strength: Yield (Proof), MPa 51
650

Thermal Properties

Latent Heat of Fusion, J/g 350
320
Melting Completion (Liquidus), °C 650
1470
Melting Onset (Solidus), °C 650
1280
Specific Heat Capacity, J/kg-K 1000
440
Thermal Conductivity, W/m-K 120
15
Thermal Expansion, µm/m-K 27
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 30
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 170
1.8

Otherwise Unclassified Properties

Density, g/cm3 1.6
8.8
Embodied Carbon, kg CO2/kg material 24
8.3
Embodied Energy, MJ/kg 170
120
Embodied Water, L/kg 970
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 17
7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 30
960
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 73
23
Strength to Weight: Axial, points 31
26
Strength to Weight: Bending, points 43
22
Thermal Diffusivity, mm2/s 75
3.8
Thermal Shock Resistance, points 11
23

Alloy Composition


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Carbon (C), % 0
1.4 to 2.0
Chromium (Cr), % 0
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Iron (Fe), % 0
0 to 3.0
Magnesium (Mg), % 98.7 to 99.6
0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 0
0 to 3.0
Silicon (Si), % 0
0 to 2.0
Tungsten (W), % 0
7.5 to 9.5
Zirconium (Zr), % 0.4 to 1.0
0
Residuals, % 0 to 0.3
0