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EQ21A Magnesium vs. EN 2.4964 Cobalt

EQ21A magnesium belongs to the magnesium alloys classification, while EN 2.4964 cobalt belongs to the cobalt 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 EQ21A magnesium and the bottom bar is EN 2.4964 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition


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