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85-platinum 15-iridium vs. R30155 Cobalt

85-platinum 15-iridium belongs to the otherwise unclassified metals classification, while R30155 cobalt belongs to the iron alloys. There are 17 material properties with values for both materials. Properties with values for just one material (17, 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 85-platinum 15-iridium and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 5.5 to 34
34
Poisson's Ratio 0.38
0.29
Shear Modulus, GPa 81
81
Shear Strength, MPa 370 to 420
570
Tensile Strength: Ultimate (UTS), MPa 560 to 730
850

Thermal Properties

Latent Heat of Fusion, J/g 110
300
Melting Completion (Liquidus), °C 1820
1470
Melting Onset (Solidus), °C 1790
1420
Specific Heat Capacity, J/kg-K 130
450
Thermal Expansion, µm/m-K 8.4
14

Otherwise Unclassified Properties

Density, g/cm3 22
8.5

Common Calculations

Stiffness to Weight: Axial, points 5.7
14
Stiffness to Weight: Bending, points 9.3
23
Strength to Weight: Axial, points 7.1 to 9.3
28
Strength to Weight: Bending, points 6.9 to 8.3
24
Thermal Shock Resistance, points 21 to 28
21

Alloy Composition

Carbon (C), % 0
0.080 to 0.16
Chromium (Cr), % 0
20 to 22.5
Cobalt (Co), % 0
18.5 to 21
Iridium (Ir), % 14.5 to 15.5
0
Iron (Fe), % 0
24.3 to 36.2
Manganese (Mn), % 0
1.0 to 2.0
Molybdenum (Mo), % 0
2.5 to 3.5
Nickel (Ni), % 0
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0
0 to 0.2
Phosphorus (P), % 0
0 to 0.040
Platinum (Pt), % 84.3 to 85.5
0
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 0
2.0 to 3.0
Residuals, % 0 to 0.2
0