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G-CoCr28 Cobalt vs. ASTM B541 Gold

G-CoCr28 cobalt belongs to the cobalt alloys classification, while ASTM B541 gold belongs to the otherwise unclassified metals. 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 G-CoCr28 cobalt and the bottom bar is ASTM B541 gold.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
110
Elongation at Break, % 6.7
6.0 to 14
Poisson's Ratio 0.28
0.4
Shear Modulus, GPa 83
38
Tensile Strength: Ultimate (UTS), MPa 560
670 to 1180
Tensile Strength: Yield (Proof), MPa 260
480 to 900

Thermal Properties

Latent Heat of Fusion, J/g 320
90
Melting Completion (Liquidus), °C 1330
1110
Melting Onset (Solidus), °C 1270
930
Specific Heat Capacity, J/kg-K 470
170
Thermal Expansion, µm/m-K 14
13

Otherwise Unclassified Properties

Density, g/cm3 8.1
17

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31
65 to 91
Resilience: Unit (Modulus of Resilience), kJ/m3 160
1090 to 3830
Stiffness to Weight: Axial, points 15
3.4
Stiffness to Weight: Bending, points 24
9.0
Strength to Weight: Axial, points 19
11 to 19
Strength to Weight: Bending, points 19
9.8 to 14
Thermal Shock Resistance, points 14
36 to 63

Alloy Composition

Carbon (C), % 0.050 to 0.25
0
Chromium (Cr), % 27 to 30
0
Cobalt (Co), % 48 to 52
0
Copper (Cu), % 0
13.5 to 15.5
Gold (Au), % 0
70.5 to 72.5
Iron (Fe), % 9.7 to 24.5
0
Manganese (Mn), % 0 to 1.5
0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 4.0
0
Niobium (Nb), % 0 to 0.5
0
Phosphorus (P), % 0 to 0.040
0
Platinum (Pt), % 0
8.0 to 9.0
Silicon (Si), % 0.5 to 1.5
0
Silver (Ag), % 0
4.0 to 5.0
Sulfur (S), % 0 to 0.030
0
Zinc (Zn), % 0
0.7 to 1.3
Residuals, % 0
0 to 0.4