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85-platinum 15-iridium vs. EN 1.3961 Alloy

85-platinum 15-iridium belongs to the otherwise unclassified metals classification, while EN 1.3961 alloy belongs to the iron alloys. There are 17 material properties with values for both materials. Properties with values for just one material (9, 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 EN 1.3961 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 5.5 to 34
31
Poisson's Ratio 0.38
0.3
Shear Modulus, GPa 81
72
Shear Strength, MPa 370 to 420
300
Tensile Strength: Ultimate (UTS), MPa 560 to 730
450

Thermal Properties

Latent Heat of Fusion, J/g 110
270
Melting Completion (Liquidus), °C 1820
1430
Melting Onset (Solidus), °C 1790
1390
Specific Heat Capacity, J/kg-K 130
460
Thermal Expansion, µm/m-K 8.4
1.3

Otherwise Unclassified Properties

Density, g/cm3 22
8.2

Common Calculations

Stiffness to Weight: Axial, points 5.7
13
Stiffness to Weight: Bending, points 9.3
23
Strength to Weight: Axial, points 7.1 to 9.3
15
Strength to Weight: Bending, points 6.9 to 8.3
16
Thermal Shock Resistance, points 21 to 28
130

Alloy Composition

Carbon (C), % 0
0 to 0.050
Chromium (Cr), % 0
0 to 0.25
Iridium (Ir), % 14.5 to 15.5
0
Iron (Fe), % 0
60.7 to 65
Manganese (Mn), % 0
0 to 0.5
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 0
35 to 37
Phosphorus (P), % 0
0 to 0.030
Platinum (Pt), % 84.3 to 85.5
0
Silicon (Si), % 0
0 to 0.5
Sulfur (S), % 0
0 to 0.020
Residuals, % 0 to 0.2
0