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85-platinum 15-iridium vs. Austenitic Nodular Cast Iron

85-platinum 15-iridium belongs to the otherwise unclassified metals classification, while austenitic nodular cast iron belongs to the iron alloys. There are 16 material properties with values for both materials. Properties with values for just one material (11, 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 austenitic nodular cast iron.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
180 to 190
Elongation at Break, % 5.5 to 34
6.8 to 34
Poisson's Ratio 0.38
0.29 to 0.3
Shear Modulus, GPa 81
70 to 72
Tensile Strength: Ultimate (UTS), MPa 560 to 730
430 to 500

Thermal Properties

Latent Heat of Fusion, J/g 110
280 to 350
Melting Completion (Liquidus), °C 1820
1340 to 1400
Melting Onset (Solidus), °C 1790
1300 to 1360
Specific Heat Capacity, J/kg-K 130
470 to 490
Thermal Expansion, µm/m-K 8.4
13 to 14

Otherwise Unclassified Properties

Density, g/cm3 22
7.7 to 8.0

Common Calculations

Stiffness to Weight: Axial, points 5.7
13
Stiffness to Weight: Bending, points 9.3
24 to 25
Strength to Weight: Axial, points 7.1 to 9.3
15 to 18
Strength to Weight: Bending, points 6.9 to 8.3
16 to 18
Thermal Shock Resistance, points 21 to 28
12 to 15