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AWS BMg-1 vs. R30021 Cobalt

AWS BMg-1 belongs to the magnesium alloys classification, while R30021 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 AWS BMg-1 and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 47
220
Elongation at Break, % 3.8
9.0
Fatigue Strength, MPa 72
250
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
86
Tensile Strength: Ultimate (UTS), MPa 180
700
Tensile Strength: Yield (Proof), MPa 110
500

Thermal Properties

Latent Heat of Fusion, J/g 350
330
Melting Completion (Liquidus), °C 600
1350
Melting Onset (Solidus), °C 440
1190
Specific Heat Capacity, J/kg-K 980
450
Thermal Conductivity, W/m-K 76
15
Thermal Expansion, µm/m-K 26
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 55
2.1

Otherwise Unclassified Properties

Density, g/cm3 1.8
8.4
Embodied Carbon, kg CO2/kg material 22
8.0
Embodied Energy, MJ/kg 160
110
Embodied Water, L/kg 980
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.9
57
Resilience: Unit (Modulus of Resilience), kJ/m3 120
570
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 66
24
Strength to Weight: Axial, points 27
23
Strength to Weight: Bending, points 39
21
Thermal Diffusivity, mm2/s 43
3.8
Thermal Shock Resistance, points 10
21

Alloy Composition


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Aluminum (Al), % 8.3 to 9.7
0
Beryllium (Be), % 0.00020 to 0.00080
0
Carbon (C), % 0
0.2 to 0.35
Chromium (Cr), % 0
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Copper (Cu), % 0 to 0.050
0
Iron (Fe), % 0 to 0.0050
0 to 3.0
Magnesium (Mg), % 86.1 to 89.8
0
Manganese (Mn), % 0.15 to 1.5
0
Molybdenum (Mo), % 0
4.5 to 6.0
Nickel (Ni), % 0 to 0.0050
2.0 to 3.0
Silicon (Si), % 0 to 0.050
0 to 1.5
Zinc (Zn), % 1.7 to 2.3
0
Residuals, % 0 to 0.3
0