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AZ61A Magnesium vs. R30003 Cobalt

AZ61A magnesium belongs to the magnesium alloys classification, while R30003 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (4, 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 AZ61A magnesium and the bottom bar is R30003 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
210
Elongation at Break, % 11
10 to 73
Fatigue Strength, MPa 130
320 to 560
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 17
83
Tensile Strength: Ultimate (UTS), MPa 280
970 to 1720
Tensile Strength: Yield (Proof), MPa 170
510 to 1090

Thermal Properties

Latent Heat of Fusion, J/g 350
310
Melting Completion (Liquidus), °C 600
1400
Melting Onset (Solidus), °C 530
1440
Specific Heat Capacity, J/kg-K 990
450
Thermal Conductivity, W/m-K 79
13
Thermal Expansion, µm/m-K 27
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 62
2.1

Otherwise Unclassified Properties

Base Metal Price, % relative 12
95
Density, g/cm3 1.7
8.4
Embodied Carbon, kg CO2/kg material 23
8.0
Embodied Energy, MJ/kg 160
110
Embodied Water, L/kg 980
400

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 310
600 to 2790
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 46
32 to 57
Strength to Weight: Bending, points 56
26 to 38
Thermal Diffusivity, mm2/s 47
3.3
Thermal Shock Resistance, points 17
26 to 45

Alloy Composition


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Aluminum (Al), % 5.5 to 7.2
0
Boron (B), % 0
0 to 0.1
Carbon (C), % 0
0 to 0.15
Chromium (Cr), % 0
19 to 21
Cobalt (Co), % 0
39 to 41
Copper (Cu), % 0 to 0.050
0
Iron (Fe), % 0 to 0.0050
10 to 20.5
Magnesium (Mg), % 90.3 to 93.9
0
Manganese (Mn), % 0.15 to 0.5
1.5 to 2.5
Molybdenum (Mo), % 0
6.0 to 8.0
Nickel (Ni), % 0 to 0.0050
14 to 16
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0 to 0.1
0 to 1.2
Sulfur (S), % 0
0 to 0.015
Zinc (Zn), % 0.4 to 1.5
0
Residuals, % 0 to 0.3
0