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AWS BVAu-4 vs. R31539 Cobalt

AWS BVAu-4 belongs to the otherwise unclassified metals classification, while R31539 cobalt belongs to the cobalt alloys. There are 15 material properties with values for both materials. Properties with values for just one material (15, 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 BVAu-4 and the bottom bar is R31539 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
220
Poisson's Ratio 0.4
0.29
Shear Modulus, GPa 41
86
Tensile Strength: Ultimate (UTS), MPa 190
1000 to 1340

Thermal Properties

Latent Heat of Fusion, J/g 100
320
Melting Completion (Liquidus), °C 950
1360
Melting Onset (Solidus), °C 950
1290
Specific Heat Capacity, J/kg-K 190
450
Thermal Expansion, µm/m-K 14
13

Otherwise Unclassified Properties

Density, g/cm3 17
8.4

Common Calculations

Stiffness to Weight: Axial, points 3.6
15
Stiffness to Weight: Bending, points 9.3
24
Strength to Weight: Axial, points 3.0
33 to 44
Strength to Weight: Bending, points 4.2
27 to 32
Thermal Shock Resistance, points 8.7
24 to 32

Alloy Composition

Aluminum (Al), % 0
0.3 to 1.0
Cadmium (Cd), % 0 to 0.0010
0
Carbon (C), % 0 to 0.0050
0 to 0.14
Chromium (Cr), % 0
26 to 30
Cobalt (Co), % 0
57.7 to 68.7
Gold (Au), % 81.5 to 82.5
0
Iron (Fe), % 0
0 to 0.75
Lanthanum (La), % 0
0.030 to 0.2
Lead (Pb), % 0 to 0.0020
0
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 17.5 to 18.5
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.0020
0
Silicon (Si), % 0
0 to 1.0
Zinc (Zn), % 0 to 0.0010
0