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AWS BCo-1 vs. AWS BMg-1

AWS BCo-1 belongs to the cobalt alloys classification, while AWS BMg-1 belongs to the magnesium alloys. There are 19 material properties with values for both materials. Properties with values for just one material (12, 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 BCo-1 and the bottom bar is AWS BMg-1.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
47
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 78
18
Tensile Strength: Ultimate (UTS), MPa 700
180

Thermal Properties

Brazing Temperature, °C 1150 to 1230
600 to 630
Latent Heat of Fusion, J/g 420
350
Melting Completion (Liquidus), °C 1150
600
Melting Onset (Solidus), °C 1120
440
Specific Heat Capacity, J/kg-K 480
980
Thermal Expansion, µm/m-K 12
26

Otherwise Unclassified Properties

Density, g/cm3 8.1
1.8
Embodied Carbon, kg CO2/kg material 8.0
22
Embodied Energy, MJ/kg 110
160
Embodied Water, L/kg 430
980

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
66
Strength to Weight: Axial, points 24
27
Strength to Weight: Bending, points 22
39
Thermal Shock Resistance, points 21
10

Alloy Composition


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Aluminum (Al), % 0 to 0.050
8.3 to 9.7
Beryllium (Be), % 0
0.00020 to 0.00080
Boron (B), % 0.7 to 0.9
0
Carbon (C), % 0.35 to 0.45
0
Chromium (Cr), % 18 to 20
0
Cobalt (Co), % 46 to 54
0
Copper (Cu), % 0
0 to 0.050
Iron (Fe), % 0 to 1.0
0 to 0.0050
Magnesium (Mg), % 0
86.1 to 89.8
Manganese (Mn), % 0
0.15 to 1.5
Nickel (Ni), % 16 to 18
0 to 0.0050
Phosphorus (P), % 0 to 0.020
0
Selenium (Se), % 0 to 0.0050
0
Silicon (Si), % 7.5 to 8.5
0 to 0.050
Sulfur (S), % 0 to 0.020
0
Titanium (Ti), % 0 to 0.050
0
Tungsten (W), % 3.5 to 4.5
0
Zinc (Zn), % 0
1.7 to 2.3
Zirconium (Zr), % 0 to 0.050
0
Residuals, % 0 to 0.5
0 to 0.3