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AWS BMg-1 vs. R30155 Cobalt

AWS BMg-1 belongs to the magnesium alloys classification, while R30155 cobalt belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (7, 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 R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 47
210
Elongation at Break, % 3.8
34
Fatigue Strength, MPa 72
310
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
81
Shear Strength, MPa 100
570
Tensile Strength: Ultimate (UTS), MPa 180
850
Tensile Strength: Yield (Proof), MPa 110
390

Thermal Properties

Latent Heat of Fusion, J/g 350
300
Maximum Temperature: Mechanical, °C 130
1100
Melting Completion (Liquidus), °C 600
1470
Melting Onset (Solidus), °C 440
1420
Specific Heat Capacity, J/kg-K 980
450
Thermal Conductivity, W/m-K 76
12
Thermal Expansion, µm/m-K 26
14

Otherwise Unclassified Properties

Base Metal Price, % relative 12
80
Density, g/cm3 1.8
8.5
Embodied Carbon, kg CO2/kg material 22
9.7
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 980
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.9
230
Resilience: Unit (Modulus of Resilience), kJ/m3 120
370
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 66
23
Strength to Weight: Axial, points 27
28
Strength to Weight: Bending, points 39
24
Thermal Diffusivity, mm2/s 43
3.2
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
0.080 to 0.16
Chromium (Cr), % 0
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Copper (Cu), % 0 to 0.050
0
Iron (Fe), % 0 to 0.0050
24.3 to 36.2
Magnesium (Mg), % 86.1 to 89.8
0
Manganese (Mn), % 0.15 to 1.5
1.0 to 2.0
Molybdenum (Mo), % 0
2.5 to 3.5
Nickel (Ni), % 0 to 0.0050
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0
0 to 0.2
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.050
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 0
2.0 to 3.0
Zinc (Zn), % 1.7 to 2.3
0
Residuals, % 0 to 0.3
0