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R31538 Cobalt vs. 90-platinum 10-iridium

R31538 cobalt belongs to the cobalt alloys classification, while 90-platinum 10-iridium belongs to the otherwise unclassified metals. There are 14 material properties with values for both materials. Properties with values for just one material (16, 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 R31538 cobalt and the bottom bar is 90-platinum 10-iridium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 23
5.5 to 34
Poisson's Ratio 0.29
0.38
Shear Modulus, GPa 86
74
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
330 to 550

Thermal Properties

Latent Heat of Fusion, J/g 320
100
Specific Heat Capacity, J/kg-K 450
130
Thermal Expansion, µm/m-K 13
8.6

Otherwise Unclassified Properties

Density, g/cm3 8.4
22

Common Calculations

Stiffness to Weight: Axial, points 15
5.3
Stiffness to Weight: Bending, points 24
9.1
Strength to Weight: Axial, points 34 to 45
4.2 to 7.1
Strength to Weight: Bending, points 27 to 32
4.9 to 6.9
Thermal Shock Resistance, points 25 to 33
13 to 22

Alloy Composition

Carbon (C), % 0.15 to 0.35
0
Chromium (Cr), % 26 to 30
0
Cobalt (Co), % 58.7 to 68.9
0
Iridium (Ir), % 0
9.5 to 10.5
Iron (Fe), % 0 to 0.75
0
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0
Nitrogen (N), % 0 to 0.25
0
Platinum (Pt), % 0
89.3 to 90.5
Silicon (Si), % 0 to 1.0
0
Residuals, % 0
0 to 0.2

Comparable Variants