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AWS BMg-1 vs. AWS BCo-1

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

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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