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ASTM B477 Au-Ni-Ag vs. R30001 Cobalt

ASTM B477 Au-Ni-Ag belongs to the otherwise unclassified metals classification, while R30001 cobalt belongs to the cobalt alloys. There are 18 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is ASTM B477 Au-Ni-Ag and the bottom bar is R30001 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 95
220
Elongation at Break, % 5.5 to 11
1.0
Poisson's Ratio 0.41
0.28
Shear Modulus, GPa 34
86
Tensile Strength: Ultimate (UTS), MPa 310 to 550
620

Thermal Properties

Latent Heat of Fusion, J/g 80
310
Melting Completion (Liquidus), °C 1010
1530
Melting Onset (Solidus), °C 930
1260
Specific Heat Capacity, J/kg-K 160
430
Thermal Expansion, µm/m-K 15
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 14
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 7.5
1.8

Otherwise Unclassified Properties

Density, g/cm3 17
9.0

Common Calculations

Stiffness to Weight: Axial, points 3.1
14
Stiffness to Weight: Bending, points 8.9
22
Strength to Weight: Axial, points 5.0 to 9.0
19
Strength to Weight: Bending, points 6.0 to 8.8
18
Thermal Shock Resistance, points 16 to 28
19

Alloy Composition

Carbon (C), % 0
2.0 to 3.0
Chromium (Cr), % 0
28 to 32
Cobalt (Co), % 0
43 to 59
Gold (Au), % 74.2 to 75.8
0
Iron (Fe), % 0
0 to 3.0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 2.6 to 3.4
0 to 3.0
Silicon (Si), % 0
0 to 2.0
Silver (Ag), % 21.4 to 22.6
0
Tungsten (W), % 0
11 to 13
Residuals, % 0 to 0.3
0