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AM50A Magnesium vs. R31537 Cobalt

AM50A 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 AM50A magnesium and the bottom bar is R31537 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
220
Elongation at Break, % 11
14 to 23
Fatigue Strength, MPa 70
310 to 480
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 17
87
Tensile Strength: Ultimate (UTS), MPa 210
1000 to 1340
Tensile Strength: Yield (Proof), MPa 120
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 350
320
Melting Completion (Liquidus), °C 620
1360
Melting Onset (Solidus), °C 570
1290
Specific Heat Capacity, J/kg-K 1000
450
Thermal Conductivity, W/m-K 65
13
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 16
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 88
2.1

Otherwise Unclassified Properties

Density, g/cm3 1.7
8.4
Embodied Carbon, kg CO2/kg material 23
8.1
Embodied Energy, MJ/kg 160
110
Embodied Water, L/kg 990
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 19
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 150
780 to 1990
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 71
24
Strength to Weight: Axial, points 35
33 to 44
Strength to Weight: Bending, points 47
26 to 32
Thermal Diffusivity, mm2/s 39
3.4
Thermal Shock Resistance, points 13
24 to 32

Alloy Composition

Aluminum (Al), % 4.4 to 5.4
0
Carbon (C), % 0
0 to 0.14
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 0
58.9 to 69
Copper (Cu), % 0 to 0.010
0
Iron (Fe), % 0 to 0.0040
0 to 0.75
Magnesium (Mg), % 93.7 to 95.3
0
Manganese (Mn), % 0.26 to 0.6
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0 to 0.0020
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Silicon (Si), % 0 to 0.1
0 to 1.0
Zinc (Zn), % 0 to 0.22
0