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ASTM B477 Au-Ni-Ag vs. G-CoCr28 Cobalt

ASTM B477 Au-Ni-Ag belongs to the otherwise unclassified metals classification, while G-CoCr28 cobalt belongs to the cobalt alloys. There are 16 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 ASTM B477 Au-Ni-Ag and the bottom bar is G-CoCr28 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 95
210
Elongation at Break, % 5.5 to 11
6.7
Poisson's Ratio 0.41
0.28
Shear Modulus, GPa 34
83
Tensile Strength: Ultimate (UTS), MPa 310 to 550
560

Thermal Properties

Latent Heat of Fusion, J/g 80
320
Melting Completion (Liquidus), °C 1010
1330
Melting Onset (Solidus), °C 930
1270
Specific Heat Capacity, J/kg-K 160
470
Thermal Expansion, µm/m-K 15
14

Otherwise Unclassified Properties

Density, g/cm3 17
8.1

Common Calculations

Stiffness to Weight: Axial, points 3.1
15
Stiffness to Weight: Bending, points 8.9
24
Strength to Weight: Axial, points 5.0 to 9.0
19
Strength to Weight: Bending, points 6.0 to 8.8
19
Thermal Shock Resistance, points 16 to 28
14

Alloy Composition

Carbon (C), % 0
0.050 to 0.25
Chromium (Cr), % 0
27 to 30
Cobalt (Co), % 0
48 to 52
Gold (Au), % 74.2 to 75.8
0
Iron (Fe), % 0
9.7 to 24.5
Manganese (Mn), % 0
0 to 1.5
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 2.6 to 3.4
0 to 4.0
Niobium (Nb), % 0
0 to 0.5
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0
0.5 to 1.5
Silver (Ag), % 21.4 to 22.6
0
Sulfur (S), % 0
0 to 0.030
Residuals, % 0 to 0.3
0