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QE22A Magnesium vs. R30075 Cobalt

QE22A magnesium belongs to the magnesium alloys classification, while R30075 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 QE22A magnesium and the bottom bar is R30075 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 44
210 to 250
Elongation at Break, % 2.4
12
Fatigue Strength, MPa 110
250 to 840
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 17
82 to 98
Tensile Strength: Ultimate (UTS), MPa 250
780 to 1280
Tensile Strength: Yield (Proof), MPa 190
480 to 840

Thermal Properties

Latent Heat of Fusion, J/g 340
320
Melting Completion (Liquidus), °C 640
1360
Melting Onset (Solidus), °C 570
1290
Specific Heat Capacity, J/kg-K 970
450
Thermal Conductivity, W/m-K 110
13
Thermal Expansion, µm/m-K 27
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 25
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 120
2.1

Otherwise Unclassified Properties

Density, g/cm3 2.0
8.4
Embodied Carbon, kg CO2/kg material 27
8.1
Embodied Energy, MJ/kg 220
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.5
84 to 140
Resilience: Unit (Modulus of Resilience), kJ/m3 400
560 to 1410
Stiffness to Weight: Axial, points 13
14 to 17
Stiffness to Weight: Bending, points 60
24 to 25
Strength to Weight: Axial, points 36
26 to 42
Strength to Weight: Bending, points 46
22 to 31
Thermal Diffusivity, mm2/s 59
3.5
Thermal Shock Resistance, points 15
21 to 29

Alloy Composition


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Aluminum (Al), % 0
0 to 0.1
Boron (B), % 0
0 to 0.010
Carbon (C), % 0
0 to 0.35
Chromium (Cr), % 0
27 to 30
Cobalt (Co), % 0
58.7 to 68
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0
0 to 0.75
Magnesium (Mg), % 93.1 to 95.8
0
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0 to 0.010
0 to 0.5
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0
0 to 1.0
Silver (Ag), % 2.0 to 3.0
0
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 0
0 to 0.1
Tungsten (W), % 0
0 to 0.2
Unspecified Rare Earths, % 1.8 to 2.5
0
Zirconium (Zr), % 0.4 to 1.0
0
Residuals, % 0 to 0.3
0