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EN 2.4964 Cobalt vs. EQ21A Magnesium

EN 2.4964 cobalt belongs to the cobalt alloys classification, while EQ21A magnesium belongs to the magnesium alloys. There are 26 material properties with values for both materials. Properties with values for just one material (8, 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 EN 2.4964 cobalt and the bottom bar is EQ21A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
44
Elongation at Break, % 40
2.4
Fatigue Strength, MPa 220
110
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
17
Tensile Strength: Ultimate (UTS), MPa 960
250
Tensile Strength: Yield (Proof), MPa 390
190

Thermal Properties

Latent Heat of Fusion, J/g 290
340
Melting Completion (Liquidus), °C 1630
640
Melting Onset (Solidus), °C 1550
560
Specific Heat Capacity, J/kg-K 400
980
Thermal Conductivity, W/m-K 15
110
Thermal Expansion, µm/m-K 12
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
25
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
120

Otherwise Unclassified Properties

Density, g/cm3 9.6
1.9
Embodied Carbon, kg CO2/kg material 9.8
27
Embodied Energy, MJ/kg 140
210

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 310
5.6
Resilience: Unit (Modulus of Resilience), kJ/m3 340
410
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 21
63
Strength to Weight: Axial, points 28
37
Strength to Weight: Bending, points 23
47
Thermal Diffusivity, mm2/s 3.9
62
Thermal Shock Resistance, points 25
15

Alloy Composition

Carbon (C), % 0.050 to 0.15
0
Chromium (Cr), % 19 to 21
0
Cobalt (Co), % 46.4 to 58
0
Copper (Cu), % 0
0.050 to 0.1
Iron (Fe), % 0 to 3.0
0
Magnesium (Mg), % 0
93.9 to 96.8
Manganese (Mn), % 0 to 2.0
0
Nickel (Ni), % 9.0 to 11
0 to 0.010
Phosphorus (P), % 0 to 0.020
0
Silicon (Si), % 0 to 0.4
0
Silver (Ag), % 0
1.3 to 1.7
Sulfur (S), % 0 to 0.015
0
Tungsten (W), % 14 to 16
0
Unspecified Rare Earths, % 0
1.5 to 3.0
Zirconium (Zr), % 0
0.4 to 1.0
Residuals, % 0
0 to 0.3